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Related Medium and Heavy Trucks Questions
Looking to take out a 7 speed manual out of a c7500 and
Hello, looking to take out a 7 speed manual out of a c7500 and replace it with an allison off of a 3116 cat, but I have a 3126 cat. just looking for positive confirmation that the back of the engines … read more
Mike Mcmillan
Mike Mcmillan
Triage Tech/Shop Foreman
Associates
578 satisfied customers
I have 99 gmc c6500 topkick with 3126 cat only start with
i have 99 gmc c6500 topkick with 3126 cat only start with starter fuel … read more
Mike Mcmillan
Mike Mcmillan
Triage Tech/Shop Foreman
Associates
578 satisfied customers
I have a 1999 cat 3126 ser. No. 7as77886 I am getting codes
Hello I have a 1999 cat 3126 ser. No. 7as77886 I am getting codes 1-11(72) 2-11(72)3-11(73)4-11(73)5-11(74) and 6-11(74) All inactive till the truck stalls out after about a minute. It will restart th… read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
10,344 satisfied customers
C15 cat not starting it's cranking but not staying at all,
C15 cat not starting it's cranking but not staying at all , when I plug in my computer I got jpro and it's saying cylinder #1 , 2 ,3 ,4 flash code 72 .73 and 74 injector current high .… read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
10,344 satisfied customers
I have a 2002 gmc C6500 with a 3126 CAT it idled rough 2
I have a 2002 gmc C6500 with a 3126 CAT it idled rough 2 days ago but smoothed out. got up the next day would crank but wouldn't start waited for about 2 hours and it started. It Started idling rough … read more
Daniel Wilson
Daniel Wilson
Auto Mechanics 1&2/diesel mech
6,062 satisfied customers
I have a 2002 gmc C6500 that was idling rough and now won't
I have a 2002 gmc C6500 that was idling rough and now won't start it just cranks I counted the check engine flashes and got 58 39 74 72 73 44 and 49… read more
Wayne
Wayne
Journeyman
Vocational, Technical or Trade Scho
5,115 satisfied customers
We have a cat c7 with flash codes showing nearly all sensors
We have a cat c7 with flash codes showing nearly all sensors having issues, could this be caused by an electrical short somewhere or some other issue causing all sensors to report incorrectlyFlash Cod… read more
Daniel Wilson
Daniel Wilson
Auto Mechanics 1&2/diesel mech
6,062 satisfied customers
Husband ran Cat 3126 out of fuel last week. Changed out all
Husband ran Cat 3126 out of fuel last week. Changed out all filters and has ran rough ever since. Now it will die and have to wait until it cools off before it will start. Any suggestions? … read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
10,344 satisfied customers
Cat 3126 330hp in a motorhome. won't start and have 39,73, &
cat 3126 330hp in a motorhome. won't start and have 39,73, & 74 fault codes … read more
Wayne
Wayne
Journeyman
Vocational, Technical or Trade Scho
5,115 satisfied customers
I have c15 act like running out of fuel and shuts down
I have c15 act like running out of fuel and shuts down changed fuel pump checked system pressures, all good, 80 psi. when it shuts down it comes up with random injector current faults, 6 right now. Ha… read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
10,344 satisfied customers
Cat c7 kal54451 250 hp engine stumbled and shut down with no
cat c7 kal54451 250 hp engine stumbled and shut down with no exhaust smoke et shows all 6 injectors open during solenoid test but the all are clicking during the test they all buzz when key is turned … read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
10,344 satisfied customers
Truck is a 2004 FL with C7 Cat, engine cranks but won't
Truck is a 2004 FL with C7 Cat, engine cranks but won't start. After several tries it will start, run for 5 to 10 minutes, and then shut off as if you turned the key off. I have replaced the timing se… read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
10,344 satisfied customers
Just replaced Injector #5 on a cat C-7 and i need dialing in
Just replaced Injector #5 on a cat C-7 and i need dialing in specs??? … read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
10,344 satisfied customers
I am looking at a 1999 c6500 GMC truck with a CAT 3126 engine
I am looking at a 1999 c6500 GMC truck with a CAT 3126 engine (SN 7a531378). Are there any known problems with this engine? Currently the engine has 86,000 miles.… read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
10,344 satisfied customers
Morning Cat man. Hope you can help me with another one. 2004
Morning Cat man. Hope you can help me with another one. 2004 Cat ACCERT, #BXS09645. Barely runs. Reads cyl1 inj current high, cyl 2 inj current high, cyl 6 inj current high. Flash Code for cyl 1 is 72… read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
10,344 satisfied customers
I have a 2009 cat c7. A cam follower failed. I will need info
I have a 2009 cat c7. A cam follower failed. I will need info on removing the hp fuel pump, its part way out but seems like theres something that needs to be released. I will also need to know how to … read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
10,344 satisfied customers
I have a 1999 GMC C6500 with a 3126 Cat that will not start.
I have a 1999 GMC C6500 with a 3126 Cat that will not start. Cranks fine, Check engine light comes on and shuts off, has 4000 PSI Hydo pressure and fuel pressure bounces between 20 and 25 PSI at the p… read more
Daniel Wilson
Daniel Wilson
Auto Mechanics 1&2/diesel mech
6,062 satisfied customers
I have an 04 peterbilt throwing codes 34 73 72 74 and 34 if
I have an '04 peterbilt throwing codes 34 73 72 74 and 34 if I've understood how to retrieve the codes correctly... can somebody tell me what they mean?… 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

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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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