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Related Medium and Heavy Trucks Questions
2004freightliner with 3126 cat truck shut off will not fire
2004freightliner with 3126 cat truck shut off will not fire back up put cat et on ran solenoid test all injectors have short ran test with injectors unhooked circuit open … read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
5,353 satisfied customers
Have a fleet of military FMTV trucks - All CAT Powered -
Have a fleet of military FMTV trucks - All CAT Powered - Have one that starts up great and runs strong for about 1/4 mile, then loses power to the point where I have to pull over. After idling or shut… read more
Curtis B.
Curtis B.
Technician
Associate Degree
1,947 satisfied customers
99 3126 cat no start. Have 2 identical trucks, been swapping
have 2 identical trucks, been swapping parts, swapped ecm, injectors, has new high pressure pump, 950 psi oil pressure while cranking, new sensor harness, new rpm sensors in front cover, no start … read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
5,353 satisfied customers
1999 freightliner fl60 with cat 3126. Will not start. Wait
1999 freightliner fl60 with cat 3126. Will not start. Wait to start light not coming on and scanner will not communicate with ecm. Unplugged wiring harness going to sensors to rule out a shorted senso… read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
5,353 satisfied customers
I am working on a 1998 GMC C7500, with CAT 3126, No cruise
I am working on a 1998 GMC C7500, with CAT 3126, No cruise control. Truck will start when it wants to and will run for 30 min. and shutdown, like someone turned the key off. Check engine flashes. I ca… read more
Wayne
Wayne
Journeyman
Vocational, Technical or Trade Scho
5,115 satisfied customers
1999 GMC C8500, Cat 3126, Allison MT 653. I installed a
1999 GMC C8500, Cat 3126, Allison MT 653. I installed a reman Allison. It now gives random check engine lights and derates the engine. No codes stored, but a drive test says loss of vehicle speed sign… read more
Daniel Wilson
Daniel Wilson
Auto Mechanics 1&2/diesel mech
6,062 satisfied customers
T360 with paccor px6 had the engine washed after driving it
t360 with paccor px6 had the engine washed after driving it to my shop, truck was sitting for about 2 before the drive. had no problems on the drive everything worked great. I have crank but no start … read more
Pete
Pete
Automotive Diagnostic Specialist
General auto certifications
38,690 satisfied customers
I have a 2008 Ford F750 truck with a CAT C7 engine. I would
I have a 2008 Ford F750 truck with a CAT C7 engine. I would like to swap it to a 3126 CAT engine. … read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
5,353 satisfied customers
2003 f650 3126 cat died wont start check engine light does
2003 f650 3126 cat died wont start check engine light does not come on now communication with cat et, have power and ground to ecm and ignition hot on pin 70, replaced ecm with reman from cat still ca… read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
5,353 satisfied customers
I have an M1078 military cargo truck with a CAT 3126, the
I have an M1078 military cargo truck with a CAT 3126, the engine starts fine and runs for 10 to 30 seconds and then shuts down. If I can catch it while it is starting to die, I can pump the throttle a… read more
Curtis B.
Curtis B.
Technician
Associate Degree
1,947 satisfied customers
We half generator part number 12420852RB and the 24 V cable
We half generator part number 12420852RB and the 24 V cable log broke off. How can I replace that . … read more
Daniel Wilson
Daniel Wilson
Auto Mechanics 1&2/diesel mech
6,062 satisfied customers
I am researching the reliability of a CAT 3126 engine. I
I am researching the reliability of a CAT 3126 engine. … read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
5,353 satisfied customers
I have a 2003 GMC 7500 with a 3126 cat, truck came in no
Hello, I have a 2003 GMC 7500 with a 3126 cat, truck came in no start no crank, could not communicate with ecm, checked power and grounds found all ok, replace ecm, now I can communicate with ecm and … read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
5,353 satisfied customers
I just bought a 2002 sterling actera dump truck with a cat
I just bought a 2002 sterling actera dump truck with a cat 3126 engine at a auction and hired a trucking firm to haul it home. At the auction site, the batteries were low so they had to jump it and us… read more
Daniel Wilson
Daniel Wilson
Auto Mechanics 1&2/diesel mech
6,062 satisfied customers
Hey Cat Man. Customer brought me a truck back in January. It
Hey Cat Man. Customer brought me a truck back in January. It is an older truck with a 3406(7FB). It had a miss and was running really bad. Long story short, pistons 1 and 2 were severly damaged. Pisto… read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
5,353 satisfied customers
I have a 1999 Chevy 2ton dump truck with a 3126 cat diesel
I have a 1999 Chevy 2ton dump truck with a 3126 cat diesel engine that wont start. I can get it started if i spray ether into the air filter it will start and run until the ether burns up. I had it to… read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
5,353 satisfied customers
HI GUY,S my question is my 3126 cat motor is vibrating and
HI GUY,S my question is my 3126 cat motor is vibrating and a little slugish at take off.it surges while exelerating.any w3ay i did the fuel regulator and that helped a lot the cat man said there was a… read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
5,353 satisfied customers
I have a 2003 Freightliner with a CAT engine. Model 3126 and
I have a 2003 Freightliner with a CAT engine. Model 3126 and Serial #HEP24920. This problem started about 2 weeks ago. I got in Monday morning to find a light had been left on all weekend, so I jumped… read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
5,353 satisfied customers
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Meet the Experts:

Daniel Wilson

Daniel Wilson

6,062 satisfied customers

Owner at DJ Wilson

Cat Man

Cat Man

Cat Engine Expert

5,353 satisfied customers

I am ASE Master Truck Certified.

Wayne

Wayne

Journeyman

5,115 satisfied customers

worked on, Gmc, Macks, Freight liner,Mercedes Benz,,Ford, sterling

Jeremy

Jeremy

Certified Truck/Bus Technician

2,756 satisfied customers

ASE Med/HD Truck Technician, NATEF Diesel Engines and Electrical/Electronics Technician, Network Engineer specializing in CAN faults, Aftertertreatment, and vehicle communications

Curtis B.

Curtis B.

Technician

1,947 satisfied customers

Technician turned service manager on multiple lines of trucks and engines, used in industry.

cumminsdr

cumminsdr

Mechanic

1,886 satisfied customers

All types of Cummins applications

Chris (aka-Moose)

Chris (aka-Moose)

Technician

641 satisfied customers

24 years of experience diagnosing & repairing

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Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.

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