Medium and Heavy Trucks

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Related Medium and Heavy Trucks Questions
I have a 2004 379 with C15 MBN. This engine will pull great
I have a 2004 379 with C15 MBN. This engine will pull great in Colorado all day long no problem from Grand Junction up to this high country I'll Telluride. From Grand Junction to Denver on the less ag… read more
Daniel Wilson
Daniel Wilson
Auto Mechanics 1&2/diesel mech
4,737 satisfied customers
I have a 92 Peterbilt Detroit 60 series d-dac 2... acts like
I have a 92 Peterbilt Detroit 60 series d-dac 2... acts like it's starving for fuel.. sounds like it's misfiring.. eventually it straightens itself out.. changed fuel filters,lines and blew air throug… read more
Daniel Wilson
Daniel Wilson
Auto Mechanics 1&2/diesel mech
4,737 satisfied customers
Plz i need help with my cat engine ... 2004 peterbilt 379
Hello, plz i need help with my cat engine ... 2004 peterbilt 379 Cat c15 Mbn12209 Engine was overhauled 70k miles ago at peterbilt shop . In past few days the truck will derate and And won't accelerat… read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
10,253 satisfied customers
Peterbilt 2004 379 bxs 10888 cat c15 -problem is engine when
peterbilt 2004 379 bxs 10888 cat c15 -problem is engine when running down road at cruise, engine will cool to about 150 degrees. sit at loading dock and idle will run about 190. pull a hill will come … read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
10,253 satisfied customers
2004 cat acert c15 Diesel engine over heats only when boost
2004 cat acert c15 Diesel engine over heats only when boost pressure reaches over 30 psi with light loads and 17 psi with heavy loads. No coolant loss or oil. Compression is good on all cylinders. Wil… read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
10,253 satisfied customers
I have a 99 Peterbilt 379 with a CAT C 12 engine that's over
I have a 99 Peterbilt 379 with a CAT C 12 engine that's over heating. I have replaced EVERYTHING and it continues to over heat only while loaded and going up a hill. Also only during the summer when t… read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
10,253 satisfied customers
My engine fan will not turn on. Either with the manual
My engine fan will not turn on. Either with the manual switch or just letting the ecm do it by water temp. I've replaced the fan air solenoid and it still will not engage. Unless I cut the wires to th… read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
10,253 satisfied customers
2002 379 pete c15 6nz cat .engine will not start without
2002 379 pete c15 6nz cat .engine will not start without either . has new fuel pump new injectors new cam and crank sensors new engine wiring harness new check valves new filter housing, new ecm. Has … read more
Edward Haniewski
Edward Haniewski
General Studies/Automotive
1 satisfied customers
I used three different mechanic to work on my 425c cat which
I used three different mechanic to work on my 425c cat which I changed to a manual cat the problem I am having is this the cat runs on the flat but has no power up hill. … read more
Drue Casey
Drue Casey
Heavy Duty Diesel Mechanic
Vocational, Technical or Trade School
I have a 1997 peterbilt 379 with a caterpillar 3406e 5ek
I have a 1997 peterbilt 379 with a caterpillar 3406e 5ek that's been having a sputter/miss fire issues. It only does the sputter or miss underload at around 1400rpms and 20-30psi boost it will stop on… read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
10,253 satisfied customers
I have a 2004 C-15 Acert Single turbo conversion Peterbilt
I have a 2004 C-15 Acert Single turbo conversion Peterbilt 379. Recently I have been getting a vibration in the truck. It is most prevalent under load and in gears 16th to 18th. Engine runs rough at R… read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
10,253 satisfied customers
I have a 1992 gmc topkick grain dump with a 3116 cat engine.
I have a 1992 gmc topkick grain dump with a 3116 cat engine. I recently had to have the fuel pump replaced. When I first picked it up it died out on me and they had to replace the fuel filter housing,… read more
Curtis B.
Curtis B.
Technician
Associate Degree
1,571 satisfied customers
I have a 97 379 Peterbilt with a 3406e and seem to have a fuel
I have a 97 379 Peterbilt with a 3406e and seem to have a fuel delivery issue as well as an asphaltene problem that came from a bunk heater that runs off one of my tanks. It turned the fuel black and … read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
10,253 satisfied customers
Hi Cat Man, Iam working on a 1999 Peterbilt 379 with a 3406E
Hi Cat Man, I'am working on a 1999 Peterbilt 379 with a 3406E CAT in it, after sitting for a couple of days it will start up right away like usual but after about 10 seconds it will stall out.To get i… read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
10,253 satisfied customers
1993 379 peterbilt 3406c 480000 miles on it…losing power...just
1993 379 peterbilt 3406c 480000 miles on it…losing power...just being really gutless...we checked the air filter and it doesn't look bad at all...what else could cause the truck to not have as much po… read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
10,253 satisfied customers
GMC c7000: I have a 96 cat 3116. It starts fine drives local
I have a 96 cat 3116. It starts fine drives local fine. It is a bucket truck so runs at 1000 rpm all day with no problems . When I climb a hill over 40 the motor runs out of power and sounds flat. I c… read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
10,253 satisfied customers
i have a c-15 cat that is loosing power on hills, but runs
i have a c-15 cat that is loosing power on hills, but runs good on all other hiway situations.… read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
10,253 satisfied customers
Have a cat C16 in a Peterbilt, it was inframed 2 weeks ago,
Have a cat C16 in a Peterbilt, it was inframed 2 weeks ago, full platnuim engine kit and has had a miss like its running outta fuel on a climb. The truck did not have this issue when I took it to the … read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
10,253 satisfied customers
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Meet the Experts:

Daniel Wilson

Daniel Wilson

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I am ASE Master Truck Certified.

Wayne

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

Jeremy

Jeremy

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cumminsdr

cumminsdr

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Curtis B.

Curtis B.

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

Chris (aka-Moose)

Chris (aka-Moose)

Technician

353 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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