Caterpillar 3126 no start troubleshooting

 

1. Also there is a water seperator under the truck with a valve/knob Mar 26, 2022 · 03-26-2022, 01:37 PM. when it's cold it's missing on 5 and 6 possibly 3. 10 posts · Joined 2005. Prime the fuel system in order to fill the fuel filter and purge trapped air. Still will not fire up. Jan 18, 2013 · I have a 3126 B caterpillar engine that ran perfectly. It is common on 3126 engines that when they start good cold and won't start hot, it is either the speed sensors or low actuation pressure. This video discusses the Caterpillar 3126 Engine. com. Lastly is a faulty engine ecm. Not OK – Cat ET displays a steady engine speed, but the engine will not start. Both the 3116 and 3126 earned a fairly poor reputation due to Caterpillar:3126 Series: No start 3126: ceres : 1 - 17-Aug-09 Original Post : 17-Aug-09 : I have a 1999 Silverton 41c with 3126ta. Injection actuation pressures around 870. The pump is bolted to the bqck of the front cover. But injection actuation output stays under 100psi. Check the Supply Voltage at the Sensor Connector Dec 6, 2011 · 2. Seems like Starter slave solenoid mounted in Oct 28, 2002 · The 3126B has a air inlet heater . Refer to Disassembly and Assembly, “Unit Injector Hydraulic Pump – Remove”. 3126E TRUCK ENGINE. Remove the rocker arms and pushrods. Fuses are ok. They are located on the drivers side of the engine underneath the high pressure oil pump. first it started with a rusty fuel tank, I swaped it out with a alum one, now it idles fine but when I rev it up to 1500 to 2500 it spits and sputters and sometimes dies. Mar 13, 2014 · C/K Man. We've replaced 2 or 3 sensors and I checked to see if there's. Engine speed timing signal. Let off throttle and it dies. 270 posts · Joined 2004. 3. What could possibly be wrong with the 7. I did pull a flash code of 61, that shows the engine has been overheated. It has 3 wires and is located on top of the engine near the Aug 29, 2015 · If the yellow check engine light does not come on when the key is turned to the on position and the engine will not start, there are only 2 things that can cause this. Ok here I go. With air in the fuel system the engine will normally be difficult to start, run rough and release a large amount of white smoke. 2. (Injection Actuation Pressure Control Valve). Sep 6, 2016 · If a Cat Diesel Engine doesn't have good fuel pressure it can cause a lot of performance related issues. Not sure there is a fuse for that but check the wiring diagram for your coach and see. The engine's design, faults, and common problems. All the fluids are fine including fresh oil change (was acting up before the service). Unless you have an active code, the cruise flash codes won't show anything. at about 40 45 mph to finish warm up and detected the missing with a slight smoke trail. S. Refer to 3100 HEUI Diesel Truck Engine Electronic Troubleshooting, SENR6566 for electronic problems and for the hydraulic troubleshooting test. Starter issues on my 3126 in Azimut 42 boat. b. Check for air in the system. N. Start By: A. A. This code is caused by one of three things. Mar 23, 2021 · New to forum and first post. When the lower one fails, the engine can be hard to start. Oil level is 1/3 of the way between "add" and "full". It should be at least 25 psi during cranking to start. Nov 9, 2011. Junior Member. These problems can cause the engine to run poorly, lose power, or not start at all. Since the engine was still under warranty, the company recalled the motors and fixed the problem. Bad inline fuse-no start 3126B. only code is not active is loss of secondary engine rpm sensor. Posted 7/25/2013 07:33 (#3228154 - in reply to #3227892) Subject: Re: Cat 3126 won't start. Probable Cause: Install a 4P8278 sight glass in the fuel return line and operate the engine to check for gas bubbles, an indication of air in the fuel system. You will see two wires going to the valve. Mar 25, 2006 · Several times. Third is low voltage to the ECM. Fuel System Not Timed Correctly To Engine Make adjustment to timing if necessary. Since you have replaced the sensors, I'm sure it is not them. It has been pretty erratic as far as when and how it does not start. I will try and help you out. This video goes over the proper component identific Feb 5, 2015 · The engine needs at least 870 psi to start. 3126 no start. NOTE: Using an electronic service tool check for logged or active diagnostic codes. . __________________. All the 3116's that I have ever seen had mechanical injection, most of the 3126's are the E model, which use HEUI injection. The engine needs at least 25 psi to start. Found it was a failed starter relay. If the combined temperature is less than 25 °C or 109 °F, the air inlet heater will turn on when the engine is cranking. Fuel Ratio Control Has A Defect Check fuel ratio control setting. « Reply #4 on: October 23, 2012, 05:05:05 PM ». B. Connect Caterpillar Electronic Technician (ET) to the service tool connector. Posted in 3126. Refer to Disassembly and Assembly, “Rocker Shaft and Pushrod – Remove”. Some of the symptoms of a bad IAP sensor are: Low or erratic oil pressure readings on the dash gauge or the electronic service tool (ET) Jun 4, 2020 · Topic Closed. . Oct 22, 2017 · For excellent, free information on you engine, call the Caterpillar RV Hotline with your engine serial number: 877 777-3126. Finally, it completely died and won't start back. However, like all mechanical systems, it is not immune to problems and failures. Hydraulic System Problem: a. Feb 18, 2020 · 8. Jan 3, 2011 · The operation of the air inlet heater is determined by the coolant temperature and the inlet manifold air temperature while the engine is cranking. Sometimes rapid operation of the starter switch will activate the starter motor which then starts the Jan 23, 2015 · Turn the ignition key switch to the On position/ Engine OFF. Engine wouldn't run, check engine and stop engine warning lamps would not do a bulb check and Ecm would not communicate. I'm having intermittent starter problems. Check the Engine Speed/Timing Circuit. May 31, 2018 · Texas. , Hard start , no- start, rough run and engine quit. Thanks your question. gauge read approx. Move the SET/RESUME switch to either position. No white smoke out of the exhaust when being turned over so I suspected the injector actuator solenoid valve was bad and replaced it. [1] Oct 20, 2020 · 1. The engine cranks like it should but makes no signs of starting. I did not change any filters so they should be filled with fuel. The programmable limits are between 5 rpm/second and 1000 rpm/second. If it is low, you have either a failed Injection actuation pressure control valve in the HEUI pump, a weak HEUI pump, a high pressure oil leak at an injector, or a faulty Injection actuation pressure sensor. Adjust if necessary. have codes for all six injectors and also an injection actuator pressure sensor code. Could huei pump be bad? Answered in 4 minutes by: Technician: Cat Man. Oct 27, 2016 · Do you own or would like to know the basics of how to troubleshoot a Cat Diesel Engine that just won't start. Check dipstick to be sure oil level is normal. Has oil and fuel pressure but no start will start on starter fluid. Results: The engine does not start and actual injection actuation pressure is below 6 MPa (870 psi). Remove the unit injector hydraulic pump. 2018. 2 Caterpillar 3126 diesel engine?Subscribe: http://bit. 2L inline 6-cylinder diesel engine produced by Caterpillar and first introduced in 1997; it was the very first electronic mid-range diesel engine that Cat had produced. Jan 10, 2009 · We do some service on a 2000 Kodiak 6500, Cat 3126, Allison, 30,000 miles, but it's a bucket truck so a lot of idle time. Hit the accelerator pedal and it ran smooth at 1,500 rpm. If the starter motor is not working as expected, it is best Sep 21, 2017 · HEUI cat 3126 cranks but will not start after sitting over the weekend unless you crank the hell out of it. Sep 8, 2011 · 3126 cat no start, will crank fine, fire on ether but not continue to run, leaks oil into fuel, assume injector o-rings are bad, have been told its been using oil for over a year and running ok. com/merchWatch next Code 42-11 is defined as an iapcv output circuit fault. I'm working on a 3126 in a business class freightliner with an automatic transmission. This is because the lower sensor is the primary start sensor. barteq. CAT 3126 Wont Start! Help. Easy way to test tho. Its easy to fix. Its hard because the oil has thinned out. I have a 3126 that has been giving me fits about starting. With a voltmeter, check for 12 VDC on the large wire out to the intake heater when someone turn the key on. In this article, we will discuss some of the most common issues that can occur with the CAT 3126 engine, as well as the symptoms and causes of these issues. 9. Without knowing the system and how to troubles Mar 17, 2015 · The engine needs at least 870 psi actuation pressure to start. Self-Diagnostics Caterpillar Electronic Engines have self diagnostic capability. 3126 engines don't have a shutoff solenoid, it is all controled by the ECM. 3126 sometimes has a long crank before starting. Forgot to start with codes found: nothing active but logged: -1-11 cyl 1 injector current fault. water in filter and none has gotten me anywhere. They have recently had an engine issue and some other things we've already repaired. Jun 20, 2016 · Have a Cat Diesel Engine and suspect that the ECM is going out or may be causing problems? The Electronic Control Module is the brain of the engine and is a Jul 18, 2017 · 3116 and 3126 Truck Engines Lifter Group – Remove and Install. Usually on a air intake, it will throw a code if bad at startup. Valve replacement is roughly 250 and lift pump around 400. Repair: Proceed to Troubleshooting, “Engine Cranks But Does Not Start”. program and heard all injectors click. The top one if the primary run sensor. 4. STOP; Test Step 5. Maintain the engine rpm until the engine operates smoothly. Turn the keyswitch to the ON position. ly/SubDeboss | Merch: https://debossgarage. First remove the solenoid, then the valve. Second is a failed engine speed timing sensor. Senior Member. Turn the cruise control ON/OFF switch to the OFF position. wondering how to fix the issue and how the oil pressure affects the fuel pressure and how to troubleshoot the system. Truck came in on a wrecker. Checked starter ok, does not get power to starter relay mounted on starter. # 7AS-----, this is a complete rebuilt engine from CAT, came with all new covers and sensors and was dyno tested, I also replaced the engine wiring harness due to several bad rub spots, new engine in, turns over great, but won't fire. Nov 29, 2009 · The only way to diagnose is with a laptop and start the engine cold. Please reply back if you need more help or have more questions. One day the battery was nearly dead and it wasn't starting. Jul 25, 2017 · 4. Thanks again. The most common item that causes low actuation pressure is a faulty IAPCV. Stb engine Did not crank when trying to restart approx 30 mins after both engines were running for return to harbour. -2-11 cyl 2. You will be able to leave a comment after signing in. 11. Ignition switch passes current on start position. 2007 Country Coach Allure Siskiyou Summit, sold/traded Nov. C. I joined to see if I could possibly find some information or opinions on a problem I am currently dealing with. replaced check valve on the back of the head, it was definitely bad but problem is still occurring with same symptoms Aug 15, 2013 · hello i have a cat eng. 97 through 01 , Cat 3126 & 3126B that I'm sure of and this may apply to other years as well. Replace or reconnect the coolant temperature sensor to prevent the engine from overheating or running too cold. Pulled the OEM harness off of the Ecm and tested power and grounds warning lamp wires Aug 19, 2013 · Cat 3126 intermittent starting. If there are leaks at the water pump, repair or install a new water pump. I had gently entered a hyw. It may or may not sta … The Caterpillar 3126 is a turbocharged 7. Posts: 309. Second opinion] Issue: no-start Cat 3126 Engine: 2001 3126B Caterpillar Engine / Serial number CKM24206 Vehicle: 2002 - Answered by a verified Technician We use cookies to give you the best possible experience on our website. Just take a couple of Ben Franklins down to your local cat dealer and pick up a 122-5053 sensor. 2019 Grand Designs 384GK-R 5th wheel. Maybe I can save you some trouble when you're trying to figure out why your Cat 3126 M May 4, 2010 · If you have no check engine light. The Caterpillar 3126 was the successor of the 3116. Constant Bleed Valve Stays Open (not enough fuel pressure for starting) Replace constant bleed valve. Refer to Troubleshooting, “Electronic Service Tools”, if necessary. I am happy to assist. Jul 16, 2017 · 3116 and 3126 Truck Engines Camshaft – Remove. I would check the following: Fuel pressure. I lost a water pump and engine coolant fluid. Join Date: Feb 2016. Yes if there is oil only coming out slowly, and the IPR has been replaced, the HEUI pump may be bad. I filled the reservoir tank for the coolant so I know the sensor not shutting engine down. Hydraulic electronic unit injectors use high pressure oil to pressurize the unit injector. 3126 Fuel Pressure Troubleshooting. Oct 28, 2020 · Results: The engine does not start and actual injection actuation pressure is above 6 MPa (870 psi). #5 · Apr 29, 2005. Aug 12, 2023 · The Caterpillar 3126 Marine Engine is known to have problems with the starter motor. Proceed to Test Step 5. Turn it counter clockwise and give it a few good strokes. 3126 Cat int no start no communication with ECM. Since the yellow check engine light comes on, this indicates the engine ECM is receiving power and functioning. Jul 25, 2017 · 3116 and 3126 Truck Engines Air In Fuel. May 31, 2013 · Marine Diesel Engines. Removal Procedure. this is the problem. I changed the 2 fuel filters and opened the air bleed plug and the truck then started and ran for about 30 min and shut off. It sounds like you either have an oil leak at an Mar 1, 2010 · School me please!! - School Bus Fleet Magazine Forums. So, a definite fuel supply issue, I thought! prefilled a new fuel filter installed and same issue. eg. Disconnect actuation pressure sensor and still does not start. it runs fine no miss and it doesnt matter if its cold or hot. I would start it and let it run regularly. Engine Serial Number - CKM23163 (Build Date - 03/08/2001, Test Date - 03/08/2001, Ship Date - 07/08/2001) Thanks. CAT 3126 does not have glow plugs and uses an air intake pre heater. School me please!! 98 Freightliner (I know). May 31, 2018. 3126E No Start RESOLVED. Hey guys thanks in advance, first time on the forum. [1] It is the successor to the Caterpillar 3116 engine and was updated to become the Caterpillar C7 engine in 2003. Engine will turn over, but not fire up. Caterpillar. On a cold engine, use a hair dryer on the intake and then see if it starts. Sep 17, 2010 · Please help. Repair: If the unit injector hydraulic pump has not been replaced, replace the pump and try to start the engine. Thanks for the information. also added additive to the tank. Again, that might point back to the water temp sensor indicating to the ECM that the engine is Apr 4, 2022 · Hey everyone, I've got a CAT 3126B in an FL80 truck, E. 40% above the bottom mark on its way to the 1/4 mark. When the system detects a problem, the CHECK ENGINE/DIAGNOSTIC (YELLOW) lamp activates. Stuck without a disel mechanic to be found. Troubleshooting Cat 3126 MUI no hot start issue Challenger 55 Tractor. Cylinders- this engine came with machined into the block. #1 · Jun 21, 2006 (Edited) Hello, I have a 2000 GMC C7500 Dumper with a cat 3126. Tried to start it after is sat for a couple of weeks. Apr 28, 2005 · 80 posts · Joined 2004. If the engine will not start, check for fluid in the cylinders (hydraulic cylinder lock) by removing the individual unit injectors. After reading several posts on here I checked engine oil. I mention 30 seconds cause this troubleshooting guide I'm reading says 30 second cycle time over and over Troubleshooting 3114, 3116 and 3126 Engines Media Number -SENR6502-06 So, Yeah, according to this document the coolant temp, oil pressure switch, power relay, and control module are the factors to look for. Fuel System Issues Aug 8, 2017 · This parameter determines the rate of ACCEL, DECEL, and RESUME Idle/PTO. The Nov 5, 2015 · Eventually, it will start, but I am guessing there is something wrong with the coolant sensor. Here's the problem, 3126 Cat in an 04 F650, intermittent crank and no start. It was really low. Calif. Complete and sign caterpillar 3126 service manual and other documents on your mobile device using the application. Injector seals will cause oil to leak from the high pressure rail in to the crankcase. heard that oil pressure may affect fuel pressure. The heater will then remain on for the duration of the crank cycle. cat 3126 problems. The first and most common is the engine ECM is not getting the correct power and ground to function. Vehicle: 2002 Thomas School Bus, front engine, flat nose busAmbient temperature does not seem to affect start / no start. Remove the fuel filter base. The temp. Get a block from destination and bus dies when I let off pedal to stop for red light. Recently I experienced a missing on the engine after a normal start and warm up. May 22, 2016 · RV Won't Start - Please Help - 1999 Newmar Dutch Star with Cat 3126: Bradstewart: Caterpillar Engine Forum: 31: 07-04-2015 11:50 PM: Cat 3126 will not start low High pressure: RwBullingt: Caterpillar Engine Forum: 7: 06-17-2015 07:40 PM: 3126 won't start: shirlock1: Caterpillar Engine Forum: 19: 10-05-2013 06:22 PM: 3126 won't Start: bhoward Nov 19, 2020 · Cat 3126 serial number 1WM14755 Crank no start no cel Will Cat 3126 serial number 1WM14755Crank no start no celWill start with tiny bit of ether then will idle fine rev up fine. Aug 13, 2017 · Install plug (1). There is a fitting near the fuel filter to connect to. Remove the rocker arms and the pushrods. Jul 24, 2013 · Cat 3126 uses oil pressure,try to start with starting fluid if it starts then u have a bad o-ring on the injector pull the valve cover and look for oil that has been sprayed that will be the one with bad o-ring. If the starter motor is not functioning correctly, it can cause the engine to fail to start. Took a group of kids 60 miles from home no problem during trip. Sep 16, 2021 · Cranking engine speed detects 200rpm roughly. Was parked on an incline facing up over the winter and started right up after sitting for months, but immediately died as soon as I hit the gas Dec 10, 2022 · In the beginning, the 3126 had a cracked block and dropped valve problem. It is 65deg here. Jan 1, 2013 · Re: HELP - 3126B CAT motor wont start. We have a 2003 Cheetah Safari with less than 30K miles on the Cat 3126e. The first is a low or no fuel pressure condition. The engine has only 49000 miles on it. 1 diesel fuel is used. Jun 1, 2012 · 1999 C6500 w/3126 Cat - sudden problem - starts and shuts off - won't stay running - changed fuel filters, HUE pump, checked all fuses and breakers and still can't figure it out. Start the engine and run the engine. 3126 No start. I know my engine RPMs are the problem because it Nov 9, 2013 · The yellow check engine light should come on everytime the key is turned to the on position. When it does not and the engine will not start, there are only 2 things that can cause this. Fuel filter had algae, we changed (and added fresh fuel). The 3126 Cat is a turbocharged 7. If I take it down the road I have to put Jul 28, 2012 · where is that and how hard to fix. If the engine starts, the sensor is bad. If the pressure is low it's caused by a weak Heui pump, faulty control valve, faulty IAP sensor, or leaking injector. When it started acting up again I removed and cleaned out the pressure regulator at the back of the Re: CAT 3126B "Wait to Start" Light. Inspect and repair or replace the air compressor to resolve Jan 25, 2015 · Cat 3126, no start no codes, removes sensor on head turned over and oil flowed out slowly, replaced ipr valve on huei pump . There are two behind the Heui pump in the front cover. 10. pressure washed engine then won't crank, won't start. Jun 13, 2014 · These issues will not usually throw codes unless the pressure drops at run time. Or, a visit to a CAT shop. May 4, 2010 · 1999 C6500 w/3126 Cat - sudden problem - starts and shuts off - won't stay running - changed fuel filters, HUE pump, checked all fuses and breakers and still can't figure it out. Hope my discovery/fix helps you! Nov 9, 2011 · Active Expediter. To test the sensor, just unplug it. Technician: Cat Man. Sep 28, 2012 · Blog Entries: 1. If you haven't already, I would check all fuses. Most likely the speed sensors not sending signal, HEUI IAP valve, or even the HEUI pump itself. IF it is below 870, the engine will not start. If an injector has been replaced, evacuate any fluids from the cylinder and attempt to start the engine. Posts: 1. 2L). Replaced hydralic and lift pump, still no start. About 5 weeks ago, upon cold start, it would turn over, and then idle fairly rough, making a loud sputter, but still running. I've got a 2003 or 2004 (says one thing on the title from what I think it is) CAT 3126E that started dying on me after we fueled up a few weeks ago. 2L inline 6-cylinder diesel engine manufactured by Caterpillar and first introduced in 1995; it was the first electronic mid-range diesel engine that Caterpillar produced. Later editions of the 3126 did not have these two issues to deal with. If you you feel no hard resistance, you have air in the system. There are several things that can cause a crank no start on this engine. Locate the relay. Bus started right up and we got to our activity. Sep 16, 2012 · Your engine has 2 engine speed timing sensors. A cold start/running issue on a Cat. Hello I have a 99 GMC with a 3126 cat engine. This video also has a "Destruction of the week" segment Jan 5, 2019 · CAT built the 3126 from 1997 to 2001, in 2002 CAT came out with a modified 3126B. The yellow lamp will flash in order to indicate a two digit flash code and the SET/RESUME switch may be released. Most likely if you have a problem with it starting it is either sucking air , the engine speed sensors arent reading correctly , or the oil in the engine is in bad shape . Jan 4, 2021 · Not OK – Cat ET displays zero engine speed and the engine does not start. Longshot might be ECM. My '98 C6500 Bobtail has a Cat 3126 motor in it. If you see leaks, install a new head gasket. Re-install it full of fuel. 3126E. The ECM should have power on pins 52, 53, and 70 of the rear most ECM connector. 6L vs. The 3126B has a air inlet heater . May 23, 2021 · 2000 Peterbuilt Caterpillar 3406E. The circuit uses a transfer pump (8) with a single piston in order to circulate fuel at low pressure. Fuel filter is new, air filter is good. I have a 2000 frieghtliner fl60 with a cat 3126 with 160000 miles. How old is that code? Apr 29, 2017 · Second opinion] Issue: Intermittent no-start Cat 3126 Engine: 2001 3126B Caterpillar Engine / Serial number CKM24206. Second is a problem in the wiring from the ecm to the iapcv. It is located on the high pressure pump on the drivers side of the engine. I'm bringing this back as a new thread even though others have posted to the issue, under various other headings. It may or may not stay running with a pull start. Monitor the “Engine Starting” screen in Cat ET. This will cause a hard starting problem cold but usually a no start condition hot, also will log 164-11 actuation fault. Caterpillar:3126 Series Jul 25, 2017 · The fuel which does not burn comes out the exhaust as white smoke. May 31, 2018 · If it is low, you have either a failed Injection actuation pressure control valve in the HEUI pump, a weak HEUI pump, a high pressure oil leak at an injector, or a faulty Injection actuation pressure sensor. Jul 14, 2016 · Thanks for the information. Cylinder head gasket leakage: Look for leaks along the surface of the cylinder head gasket. scassell. Nov 29, 2009 · After about 2 weeks of being idle, it would turn over but did not fire. When the temp got below 45 the air heater came on, but still was hard to start. Join Date: Mar 2022. Had posted on tech help and was told best bet was to post on HD forum so cut and pasted original post below. Reduce the engine rpm to low idle. The fuel supply circuit is a conventional design for injected engines. 7. Feb 1, 2019 · The engine needs at least 870 psi to start. Jun 21, 2006 · wlaukaitis Discussion starter. Jun 1, 2011 · Technician: Cat Man. You can quickly make and fill out legal forms with the help of the pdfFiller app on your phone. Nov 15, 2012 · Hi, I have a 3126 in a 2004 Ford that was running fine when I parked it. Check and replace the fuel filter, injector, or increase fuel pressure to resolve fuel injector failure. #3 · Mar 13, 2014 (Edited) The 3126 is a slightly larger version of the 3116 (6. When facing a crank-no-start issue without a Check Engine Light (CEL) illuminated, there could be several potential causes for this behavior. The Caterpillar 3126 engine is a popular diesel engine used in various applications like trucks, buses, and some marine vessels. The first a failed iapcv on the huei pump. Hello Folks, Getting our FL chassis Discovery ready for a trip to find it started but kicked, bucked and idle was ruff. Remove the front cover. Jan 20, 2010 · i've got a 2000 freightliner fl70 with a 3126 cat. It was parked for about 3 years. 3L Powerstroke. No Overfueling Spring Install an overfueling spring. Hold that position until the yellow lamp begins to flash. Refer to Disassembly and Assembly, “Fuel Filter Base – Remove and Install”. once it warms up everything seems to start firing except for 6. Nov 6, 2019 · Posts: 2. Oct 8, 2023 · The 3126 HEUI fuel system uses hydraulic electronic unit injectors (3) . CAT 3126 Engines For Sale. Intake heater light not lighting. It has close to 200k miles, but ran great. If it is low, the injectors will not get Jan 19, 2023 · The CAT 3126 engine is a versatile and reliable diesel engine produced by Caterpillar Inc. To verify, you would need to pull the codes or have the ECM codes read. On the secondary fuel filter housing, there is a primer pump. I replaced that battery and she turned over easily but would not start. Oct 15, 2020 · A. #1. If you want to learn more about how the PDF editor works, go to pdfFiller. Replaced the pump and now I dont get a helm start light or sea fire halon control test, engine cranks but wont fire. Covers: Caterpillar 3126B and 3126E truck engines with serial number prefixes: BKD G3E DPF 1AJ 8YL CKM CRP 7AS 8SZ 9SZ Pages: 412 Format: PDF file File size: 4mb Compatibility: Windows/Mac computers Notes: Searchable, printable, instant download This downloadable troubleshooting manual covers symptom and code-based troubleshooting for Cat 3126B and 3126E on-highway diesel engines with the Aug 30, 2019 · Thanks for the help cat. Did an injector solenoid test with the cat. The inlet air heater is used to improve the cold start capability of the engine and to reduce white smoke after startup. When running, it should stay between 65 and 85 psi at all times. Posts: 641. The IAP sensor is prone to some common problems, such as oil leaks, faulty readings, and wiring issues. At the same time I changed the oil and replaced the filter so that is clean. Apr 4, 2013 · 3126 wierd ECM problem. White smoke is normal in cold temperatures until the engine operates long enough to become warm. It only has roughly 80k miles. There will be less white smoke if No. Jul 25, 2017 · Leaks in the water pump: Check the water pump for leaks before starting the engine, then start the engine and look for leaks. check icp pressure desired is 1400 psi and actual is 1400 psi. Nov 13, 2023 · Key Takeaways for Maintaining and Repairing Caterpillar 3126 Engines. I changed both the fuel filter and fuel/water separator when it first started and that seemed to help for a while. i got a dump truck with the 3176 cat engine that cranks but won’t start. That system is very similar to what's on the 7. The first and most common is the engine ECM is not receiving correct power and ground. Jan 29, 2018 · The engine needs at least 870 psi to start. The IAPCV (Injection Actuation Pressure Control Valve ) will "stick" if it gets any traces of material in it . It is easy to swap out, right on the drivers side of the engine, above the air compressor, on the back of the HEUI pump. I think you are correct based on this info from the Freightliner Parts Pro. It screws out of the pump. Fuel will flow from the cylinder head into the cylinders when a unit injector is removed. Pull off the fuel filter and make sure it is full. Takes about 10 minutes, tops. Start the engine and immediately increase the engine rpm to 1/2 of rated rpm. Every 4 or 5 attempts to start there is no response except for a clicking from a small relay on the engine side of the firewall low on the passenger side. RV has been sitting for 4 months. Rod, Certainly sounds like a loose connection or the pre-heat relay/solenoid with the points sticking. It won't start, I think the prime has been lost, I tried to charge the fuel system with the primer pump but it seems it is taking too long. When it does start it will fire on all but one cylinder and will run out of it and run fine after about a min of idling. The starter motor is responsible for cranking the engine and is typically located on the side of the block. The battery power to the Cat, Engine Control Module Dec 31, 2012 · I have a 2002 GMC c6500 with a Cat 3126 engine. 5. May have air in the fuel system. mf tf oc af qe bf od tc rh ye