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Gmc t7500 had a 3126 cat that was knocking swapped it with
Gmc t7500 had a 3126 cat that was knocking swapped it with another c7500 cat 3126 parts truck I had & now i have some codes I'm not too familiar with. 253-2 & 253-14. I tried programming the ecm to gm… read more
SteveR
SteveR
Shop Manager
High school
6 satisfied customers
Working on a 3126 cat in a 1998 chevy c7500. It cranks but
Working on a 3126 cat in a 1998 chevy c7500. It cranks but will not start. I have replaced speed sensors and harness. I have replaced ecm and verified grounds and power to ecm. I have replaced injecto… read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
5,353 satisfied customers
Cat 3126 starts right up as soon as I try to give it
Cat 3126 starts right up as soon as I try to give it throttle it wants to shut down if I unplug the Huey pump It won't let me throttle up But if I put it in drive it will not let the motorhome move Wh… read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
5,353 satisfied customers
No fuel coming out of fuel pump. 2001 c7500 3126 8yl. I ran
yes. i ran a fuel line from huie straight to the pick up tube in tank bypassing all filters. took exit line off of huie and cranked and got no fuel coming out. … read more
Daniel Wilson
Daniel Wilson
Auto Mechanics 1&2/diesel mech
6,062 satisfied customers
I have the same fault code 164 fmi 11and I am replacing the
I have the same fault code 164 fmi 11and I am replacing the ICP sensor and IPR valve would that be accurate. … read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
5,353 satisfied customers
Replaced my huei pump no start. 1999 gmc toplick c7500 3126.
originally i replaced the huei pump because it was only putting out 20 psi max. the new one puts out 60-65 … read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
5,353 satisfied customers
1999 C7500 CAT 3126. THE COMPUTER FRIED. I installed a reman
1999 C7500 CAT 3126. THE COMPUTER FRIED. I installed a reman one programmed to my engine serial #. The engine starts and runs for about 30 seconds and shuts off. I connected my cheap scanner and it is… read more
Mike Mcmillan
Mike Mcmillan
Triage Tech/Shop Foreman
Associates
607 satisfied customers
I have a c7 that at a idle The engine hunts if you look at
I have a c7 that at a idle The engine hunts if you look at the computer it's commanding 1400 pounds and then all of a sudden it's commanding 2300 and starts running really erratic at an iidle We put i… read more
AaronF721
AaronF721
Lead Technician
Diesel Technology
I have a 2000 Airstream pusher with a 3126 Caterpiller
Hi. I have a 2000 Airstream pusher with a 3126 Caterpiller engine. It starts just fine but it will not die. I have to go back and unplug the Huey pump in order for it to shut off. … read more
Wayne
Wayne
Journeyman
Vocational, Technical or Trade Scho
5,115 satisfied customers
Cat 3126B. Just replaced the ecu and now have multiple codes
Cat 3126B. Just replaced the ecu and now have multiple codes and still will not start … read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
5,353 satisfied customers
I am a heavy duty mechanic by trade. I have a 3126 cat
Hello I am a heavy duty mechanic by trade . I have a 3126 cat s/n#7as05448 in my 1998 national RV on a freightliner chassis. I bought this RV last spring. I serviced the whole unit. I used chevron del… read more
Mike Mcmillan
Mike Mcmillan
Triage Tech/Shop Foreman
Associates
607 satisfied customers
We have a 3126 sn CKM34634 it came into the shop running but
we have a 3126 sn CKM34634 it came into the shop running but smoking bad. We found coolant temp sensor was bad , that took some of the smoke away, we thought possible injector seals. We removed the in… read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
5,353 satisfied customers
Has code PID 164 FMI 11. 2002 chevrolet Kodiak w 3126 cat.
put a huei pump on had no fuel pressure before now have pressure but has this code … read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
5,353 satisfied customers
I have a 3126 and a c-7. 3127 came out of a 2003 6500 and we
i have a 3126 and a c-7. 3127 came out of a 2003 6500 and we put it in a 05 7500 that has a c-7. When we put the wiring and computer out of thr 3126 all the lights in the dash are on and runs like cra… read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
5,353 satisfied customers
I swapped out a c7 serial # ***** and installed a 3126 serial
I swapped out a c7 serial # ***** and installed a 3126 serial # ***** I put all the c7 sensors on the 3126 (plugged right in). the truck turns over but wont fire/start. any suggestions?… read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
5,353 satisfied customers
Have a 3126 cat ckm that will not start. Replaced heui after
Have a 3126 cat ckm that will not start. Replaced heui after local diesel shop plugged their computer into it. It started and ran for several minutes died and will not start. Have a gauge in oil line … read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
5,353 satisfied customers
i have a 2003 fl80 with a 3126 cat motor serial no. ckm 55015
i have a 2003 fl80 with a 3126 cat motor serial no. ckm 55015 motor droped a valve going to replace found a 2000 gmc with a 3126 cat serial no. 8yl83373 mine is a 250 hp 3126e the other a 3126b it is … read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
5,353 satisfied customers
What is making the huei pump only produce 500 psi until I unplug
What is making the huei pump only produce 500 psi until I unplug the injection control pressure sensor on top the head. With it unplugged the huei pump will put out 5000psi… 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

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I am ASE Master Truck Certified.

Wayne

Wayne

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

Jeremy

Jeremy

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

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Curtis B.

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cumminsdr

cumminsdr

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All types of Cummins applications

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Chris (aka-Moose)

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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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