Medium and Heavy Trucks

Have truck repair questions? Ask an Expert

Connect one-on-one with {0} who will answer your question

Related Medium and Heavy Trucks Questions
2003 kenworth t300 caterpillar 3126 will crank no start have
2003 kenworth t300 caterpillar 3126 will crank no start have replaced high pressure pump transfer pump timing sensors have no response on tach found tach circuit to high pressure is at 3.5 volts where… read more
Daniel Wilson
Daniel Wilson
Auto Mechanics 1&2/diesel mech
4,431 satisfied customers
Cat 3126 no start. 02 gmc 7500 3126 cat. Not getting 5v to
not getting 5v to the Injection actuation sensor to the pump … read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
10,186 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
10,186 satisfied customers
My cat 3126 won't start. It's a 2001 gmc t series truck with
It's a 2001 gmc t series truck with a cat 3126 engine … read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
10,186 satisfied customers
I have a 99 c8500 with the cat motor it died and won't start
I have a 99 c8500 with the cat motor it died and won't start I put a snap on scanner on it it it says on ecm detected … read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
10,186 satisfied customers
I have a cat 3126 no codes does not start check the HEUI
I have a cat 3126 no codes does not start check the HEUI pump output pressure no oil pressure at all any other way I could check that pump… read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
10,186 satisfied customers
I have 3126 cat in 2000 gmc top kick, it died on highway, i
i have 3126 cat in 2000 gmc top kick, it died on highway, i had it scanned no ECM detected, check power at pins on harness that connected to ECM and they had power, i then borrowed a used ECM, it stil… read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
10,186 satisfied customers
Cat Man, I have a 2003 Peterbilt with a CAT C-15 MBN16293,
Hi Cat Man, I have a 2003 Peterbilt with a CAT C-15 MBN16293, the engine will not start. When I turn on the ignition none of the dummy lights come on including the check engine light. The truck igniti… read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
10,186 satisfied customers
How is your service priced? Cat 3126 in '99, Trying to! New
Trying to! New speed/timing sensor, new fuel transfer pump, checked power to ecm (from harness side), pin 70 has 9.8 to 10 volts when cranking, Fuel restrictor at back of head works, with no sign of metal fragments. Also, sprayed contact cleaner on both ECM pins and sockets. This cat 3126 is in '99 GMC. Engine serial #7AS79444. Oh, cannot check flash codes as vehicle does not have cruise control. … read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
10,186 satisfied customers
I have a 2000 C6500 with a CAT 3126 engine serial #8YL51753,
I have a 2000 C6500 with a CAT 3126 engine serial #8YL51753, customer called truck died after hot run, went up to check truck will start with either, wont idle, changed fuel filter, same thing added f… read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
10,186 satisfied customers
I have a 2003 ford f650 with the VIN 3FDNF65A28MB07870 with
I have a 2003 ford f650 with the VIN 3FDNF65A28MB07870 with a caterpillar 3126 serial #CKM67551. Truck is a no start condition. Vehicle was running ok. Turned it off, it sat for an hour, and would not… read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
10,186 satisfied customers
We have a 1998 Chevy 6500c with a 3126 cat diesel engine.
We have a 1998 Chevy 6500c with a 3126 cat diesel engine. Model C7H0442. The engine was running great and then we parked the truck for about a week. Now it will not start unless you spray either into … read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
10,186 satisfied customers
I have a 1997 Louisville Dump with a 3126. I am installing a
I have a 1997 Louisville Dump with a 3126. I am installing a motor from a 99 Sterling 3126. I have the 40 to 70 pin adapter but get no power to my ecm Plug. I have checked power coming direct from Bat… read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
10,186 satisfied customers
I have a 01 gmc with 3126 cat engine we drove it one day the
I have a 01 gmc with 3126 cat engine we drove it one day the next day it wouldn't start. We checked fuel filters, opened bleeder on the fuel filter, checked fuses, put a new emc that the cat flashed. … read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
10,186 satisfied customers
Hey man, Ive got a 1995 Freightliner FL70 with a cat 3126 engine
Hey man, Ive got a 1995 Freightliner FL70 with a cat 3126 engine that has been sitting for a couple years. i got her running about a month ago and then it sat again. However, when i had to running, it… read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
10,186 satisfied customers
I have a 99 Freightliner FL 70 with a 3126 Cat. The engine
I have a 99 Freightliner FL 70 with a 3126 Cat. The engine cooling fan stays on all the time. Took it off and tested the air clutch as borking fine. Any ideas what to look at next? Thanks… read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
10,186 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
10,186 satisfied customers
2000 GMC topkick with a 3126 cat engine. Shut off while running,
2000 GMC topkick with a 3126 cat engine. Shut off while running, will not restart. Checked voltage to ecm. 12 volts to pins 52 an 53 .I have 1200 psi. pressure in high pressure manifold while cranking… read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
10,186 satisfied customers
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.

JustAnswer in the News:

Ask-a-doc Web sites: If you've got a quick question, you can try to get an answer from sites that say they have various specialists on hand to give quick answers... Justanswer.com.
JustAnswer.com...has seen a spike since October in legal questions from readers about layoffs, unemployment and severance.
Web sites like justanswer.com/legal
...leave nothing to chance.
Traffic on JustAnswer rose 14 percent...and had nearly 400,000 page views in 30 days...inquiries related to stress, high blood pressure, drinking and heart pain jumped 33 percent.
Tory Johnson, GMA Workplace Contributor, discusses work-from-home jobs, such as JustAnswer in which verified Experts answer people’s questions.
I will tell you that...the things you have to go through to be an Expert are quite rigorous.

What Customers are Saying:

Wonderful service, prompt, efficient, and accurate. Couldn't have asked for more. I cannot thank you enough for your help.

Mary C.Freshfield, Liverpool, UK

This expert is wonderful. They truly know what they are talking about, and they actually care about you. They really helped put my nerves at ease. Thank you so much!!!!

AlexLos Angeles, CA

Thank you for all your help. It is nice to know that this service is here for people like myself, who need answers fast and are not sure who to consult.

GPHesperia, CA

I couldn't be more satisfied! This is the site I will always come to when I need a second opinion.

JustinKernersville, NC

Just let me say that this encounter has been entirely professional and most helpful. I liked that I could ask additional questions and get answered in a very short turn around.

EstherWoodstock, NY

Thank you so much for taking your time and knowledge to support my concerns. Not only did you answer my questions, you even took it a step further with replying with more pertinent information I needed to know.

RobinElkton, Maryland

He answered my question promptly and gave me accurate, detailed information. If all of your experts are half as good, you have a great thing going here.

DianeDallas, TX

< Previous | Next >

Meet the Experts:

Daniel Wilson

Daniel Wilson

4,431 satisfied customers

Owner at DJ Wilson

Cat Man

Cat Man

Cat Engine Expert

10,186 satisfied customers

I am ASE Master Truck Certified.

Wayne

Wayne

Journeyman

3,893 satisfied customers

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

Jeremy

Jeremy

Certified Truck/Bus Technician

2,738 satisfied customers

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

cumminsdr

cumminsdr

Mechanic

1,629 satisfied customers

All types of Cummins applications

Curtis B.

Curtis B.

Technician

1,413 satisfied customers

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

Chris (aka-Moose)

Chris (aka-Moose)

Technician

311 satisfied customers

16 years of experience

< Previous | Next >

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.

Show MoreShow Less

Ask Your Question

x