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Related Medium and Heavy Trucks Questions
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
5,171 satisfied customers
I got a 2000 GMC 6500 with 3126 Cat code 128-3 Secondary
I got a 2000 GMC 6500 with 3126 Cat code 128-3 Secondary fuel level voltage high 8 … read more
Daniel Wilson
Daniel Wilson
Auto Mechanics 1&2/diesel mech
10,968 satisfied customers
I am having the same exact issue. 02 gmc c6500 cat 3126
02 gmc c6500 cat 3126 crank no start or start and sputter out. Flash codes 58 72 73 74 … read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
5,171 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
3,893 satisfied customers
Have a cat 3126 that starts fine but runs a bit rough until
Have a cat 3126 that starts fine but runs a bit rough until warmed up, then runs perfect all day no check engine light. Recent work speed sensors replaced, orings, injector cups, ipr. No big deal just… read more
Daniel Wilson
Daniel Wilson
Auto Mechanics 1&2/diesel mech
10,968 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
5,171 satisfied customers
I have a cat c15 acert NXS, i did an overhaul than truck
i have a cat c15 acert NXS , i did an overhaul than truck left on the road , run for 1500 miles perfect than start giving injector codes,72 at the beginning .Pulled the valve cover find one stud brock… read more
Daniel Wilson
Daniel Wilson
Auto Mechanics 1&2/diesel mech
10,968 satisfied customers
2002 gmc school bus with a cat 3126 and a allision 2000
2002 gmc school bus with a cat 3126 and a allision 2000 series light comes on (shift inhibited) bus doesn't move in any postion just had a mechanic change radiator because of a leak. low coolant light… read more
Mike Mcmillan
Mike Mcmillan
Triage Tech/Shop Foreman
Associates
352 satisfied customers
Here I have a 3126 that developed a small oil leak on high
hello Jeff here I have a 3126 that developed a small oil leak on high pressue line from HEUI pump to head engine was lopping at idle changed line and injection control valve because it was very rusty … read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
5,171 satisfied customers
1996 F350 7.3 It was running great, starting great ; no
1996 F350 7.3 It was running great, starting great ; no issues. I noticed I had diesal in the valley and determined it was my mechanical fuel pump that was leaking through the peep hole. I replaced th… read more
Curtis B.
Curtis B.
Technician
Associate Degree
1,413 satisfied customers
HAVING TROUBLE STARTING OUR CAT ENGINE. TRUCK IS A 98 GMC
HAVING TROUBLE STARTING OUR CAT ENGINE. TRUCK IS A 98 GMC 6500. ENGINE IS A 3126, ALLASON TRANS. ENGINE RAN GREAT A FEW DAYS AGO. NOW IT WONT START. STARTS WITH STARTING FLUID, BUT WONT CONTINUE TO RU… read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
5,171 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
5,171 satisfied customers
I have a c6500 chevy with a 3126 cat engine. my problem is
I have a c6500 chevy with a 3126 cat engine. my problem is it shuts down at high rpms because the ign breaker trips. the truck will idle or run at lower rpms all day. as soon as it hits top eng limit,… read more
Jeremy
Jeremy
Certified Truck/Bus Technician
Associate Degree
2,738 satisfied customers
gmc c6500: My 2002 c6500 deisel towtruck started actin like
My 2002 c6500 deisel towtruck started actin like it wanted to cut off after it get up to about 4th gear then it would smooth out and go on.now it want start at all but acts like it want to start.i cha… read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
5,171 satisfied customers
Freightliner fl70: my truck is having a problem the truck start
my truck is having a problem the truck start but then shut off and wont start again and if I let it sit for 5 minutes the truck starts again but shut off again and it look is fuel but have chage the p… read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
5,171 satisfied customers
GMC c6500: i have a 98 gmc c6500. it starts rough and smokes.
i have a 98 gmc c6500. it starts rough and smokes. runs fine for a while, then idles low and starts running rough again. smokes when you press on the throttle then runs fine again for a little while. … read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
5,171 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
5,171 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
5,171 satisfied customers
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Meet the Experts:

Daniel Wilson

Daniel Wilson

10,968 satisfied customers

Owner at DJ Wilson

Cat Man

Cat Man

Cat Engine Expert

5,171 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

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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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