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Related Medium and Heavy Trucks Questions
I have a 1997 Beaver motorhome with the Cat 3126. It has
I have a 1997 Beaver motorhome with the Cat 3126. It has starting issues. … read more
Curtis B.
Curtis B.
Technician
Associate Degree
1,947 satisfied customers
I have a 1999 top kick w/ 3126 cat auto trans shut off,
I have a 1999 top kick w/ 3126 cat auto trans shut off, started back up several times and each time it ran for less time . Till now it won't run at all. Unplugged Isp sensor and still nothing. It will… read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
10,344 satisfied customers
I have a 2003 c12 in a Peterbilt. The driver said that it
I have a 2003 c12 in a Peterbilt. The driver said that it lost power and died once. He got it going again and drove it to the job site. I changed the primer pump … read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
10,344 satisfied customers
Would like to start diagnosing a problem with my 3126 using
Would like to start diagnosing a problem with my 3126 using cat man … read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
10,344 satisfied customers
I have an 02 fl80 with 3126 cat. It starts and runs 3 or 4
I have an 02 fl80 with 3126 cat . It starts and runs 3 or 4 seconds and then dies. Crank again for 4 to 10 seconds it will start and run fine. If I shut it off starts fine unless it sits 15 minutes th… read more
Wayne
Wayne
Journeyman
Vocational, Technical or Trade Scho
5,115 satisfied customers
Steve,Cat 3126. Cat 3126 in a 2003 motorhome. Ran great with
Ran great with no issues. Has been sitting ~3 months. Cranks but no start. Disconnect IAP sensor and it starts, but a bit rough at normal idle. Reconnect IAP sensor, no start. … read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
10,344 satisfied customers
I have a 2004 chevy truck with a cat engine that dies going
I have a 2004 chevy truck with a cat engine that dies going down the road. … read more
Mike Mcmillan
Mike Mcmillan
Triage Tech/Shop Foreman
Associates
593 satisfied customers
Got a 2001 gmc topkick with 3126 in it. Was running fine.
Got a 2001 gmc topkick with 3126 in it. Was running fine. Went to start long cranking. Had already run into bad inj actuation sensor couple weeks back. Fixed that. I unplugged the sensor again to test… read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
10,344 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
3126 Catapillar engine will start and idle fine When you try
3126 Catapillar engine will start and idle fine When you try to move truck engine has Power for a few seconds then no power and will stall but will start right back up Does not matter if engine is col… read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
10,344 satisfied customers
I have a 3126 cat in a 7500 Chevy, drove to work just fine
I have a 3126 cat in a 7500 Chevy, drove to work just fine then when I tried to leave the starter ingauged but died. Now I have power when I turn my switch on and my chassis are clicking but no power … read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
10,344 satisfied customers
I HAVE A 2000 GMC WITH A CAT 3126, SOME DAYS IT WILL START
I HAVE A 2000 GMC WITH A CAT 3126, SOME DAYS IT WILL START AND RUN FINE THEN I WILL BE DRIVING 65 MPH AND IT DIES AS IF I TURNED THE KEY OFF. SOME TIMES IT WILL RESTART BEFORE I STOP. IF I CRANK ON IT… read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
10,344 satisfied customers
I have a 2001 cat 3126 in a fl70 box truck with 276,000
i have a 2001 cat 3126 in a fl70 box truck with 276,000 miles the flash codes are 39 15 49 12 61 69. It starts up then the engine protect light comes on and shuts the motor down. I cleaned all connect… read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
10,344 satisfied customers
Morning. Hoping Cat Man is around one? I am working on a
Morning. Hoping Cat Man is around for this one? I am working on a 1999 GMC cab forward truck with a 3126 Serial# ***** Short story is, Started the truck this morning, fired up as it should, ran fine. … read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
10,344 satisfied customers
I have 2002 3126 with an Allison. It runned good despite
Hi, I have 2002 3126 with an Allison. It runned good despite a lot of blowby, I was told by a shop that 2 injectors were bad, replaced all of them with no improvements. It sometimes was hard to start … read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
10,344 satisfied customers
I HAVE CAT 3126 YEAR 1999 SERIAL#7AS47065 WITH 4 CODES FIRST
I HAVE CAT 3126 YEAR 1999 SERIAL#7AS47065 WITH 4 CODES FIRST CODE PID 64 FMI 2 FC 34 / SECOND CODE PID 111 FMI 2 FLASH CODE 12 / THIRD CODE PID 43 FMI 2 FC 71 / FORTH CODE PID 64 FMI 11 FLASH CODE 41 … read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
10,344 satisfied customers
Have cat 3126 w/ codes 49 inlet heater circuit fault39 inj actuation p
Have cat 3126 w/ codes 49 inlet heater circuit fault 39 inj actuation pressure sensor 12 coolent level sensr fault 34 engine RPM signal fault 31 loss of veh speed signal 15 inj actu press sensor circu… read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
10,344 satisfied customers
I am having a problem with a 1999 CCC rear load garbage truck
I am having a problem with a 1999 CCC rear load garbage truck with a 3126 (7AS49610). The truck was shutting down when you tried to compact trash (like starving for fuel) and may start right back up o… read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
10,344 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

10,344 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

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

cumminsdr

cumminsdr

Mechanic

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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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