Medium and Heavy Trucks

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I have a cm870 when pulling out loaded and on a hard pull it
I have a cm870 when pulling out loaded and on a hard pull it will lose power like turning the key off and back on and occasionally show code for low fuel psi and will sometimes even quit. May go days … read more
cumminsdr
cumminsdr
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High School or GED
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I have a 5.9 cummins in motorhome. Air compressor is not
Second opinion] I have a 5.9 cummins in motorhome. Air compressor is not supplying enough air for brakes. I rebuilt air dryer and drained tge tanks so far. … read more
Andy
Andy
truck /coach technician
Vocational, Technical or Trade School
210 satisfied customers
3126 cat, engine started missing when started after sitting
3126 cat, engine started missing when started after sitting for a day. tried driving, no power, wouldn't hardly run below 1500 rpm. Stopped and hanged fuel filter. once primed seemed to run ok for a s… read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
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Got a 2006 dodge 3500 with 5.9 Diesel. Fuel pump went out.
Got a 2006 dodge 3500 with 5.9 Diesel. Fuel pump went out. Replaced pump and fuel filter.. Truck will only do about 25 mile per hour. It will rev up in park to 3000 rpm or more but driving it will on … read more
Wayne
Wayne
Journeyman
Vocational, Technical or Trade Scho
4,023 satisfied customers
Have a 2008 F750 Service truck with small crane. Maybe you
Have a 2008 F750 Service truck with small crane. Maybe you know the type. Has a CAT C7 engine and problems known for this year of production. To the point: it runs great with RPM 1800 and above. Take … read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
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I have a 2003 international 4300 dt466, 553243 km on inframe
I have a 2003 international 4300 dt466, 553243 km on inframe rebuilt at 350k, started overheating, oil mixing coolant, replace oil cooler, ran for 1hr. all looked ok, parked an d tried to restart in 4… read more
Wayne
Wayne
Journeyman
Vocational, Technical or Trade Scho
4,023 satisfied customers
I have a Tiffen motorhome with a 400 hp Cummins. 60000
I have a Tiffen motorhome with a 400 hp Cummins. 60000 miles. Only use it 3-4 times per year. When I first start it up, the check engine light comes on and it runs with partial power. after about 8-10… read more
Wayne
Wayne
Journeyman
Vocational, Technical or Trade Scho
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I have a 05 kw with a cummins ISM it generally runs fine
I have a 05 kw with a cummins ISM it generally runs fine until you start going up hill under a load then it bogs down real bad and blows heavy black smoke then it clears up and takes off regaining ful… read more
cumminsdr
cumminsdr
Mechanic
High School or GED
1,700 satisfied customers
Here have2010 isx cummins smoking black smoke excessively
hi jeff here have2010 isx cummins smoking black smoke excessively under acceleration just install ed new cylinder head have double checked wedge and pin timing turbo actuator… read more
Andy
Andy
truck /coach technician
Vocational, Technical or Trade School
210 satisfied customers
Andy, wife, me, and dogs stuck at a truck stop N of Mexico
Andy, wife, me, and dogs stuck at a truck stop N of Mexico City, Mexico. We have a motorhome on a Workhorse W22 with a Maxxforce 7. Yesterday started whining upon exceleration and got louder and worse… read more
Jeremy
Jeremy
Certified Truck/Bus Technician
Associate Degree
2,740 satisfied customers
I just bought a 2015 Mack CXU-613 heavy haul truck. During
I just bought a 2015 Mack CXU-613 heavy haul truck. During the first week of operation (2,700 highway miles), the oil temperature has always stayed around 240-244F, while oil pressure gauge shows 45-5… read more
Wayne
Wayne
Journeyman
Vocational, Technical or Trade Scho
4,023 satisfied customers
I have a 2003 350 cummins ISC engine in a 2003 freightline. The power is find from dead s
I have a 2003 350 cummins ISC engine in a 2003 freightline. The power is find from dead start \until around 40/45 miles per hour, changing from 4th to 5 gear, then motor cuts-out/shutters and check en… read more
Andy
Andy
truck /coach technician
Vocational, Technical or Trade School
210 satisfied customers
F750: have a 2006 ford f750 w 6.2 cummins. it is blowing black
have a 2006 ford f750 w 6.2 cummins. it is blowing black smoke badly and doesn't have any power until the turbo spools and it hits about 2200 rpm. could the egr be stuck open??… read more
Jeremy
Jeremy
Certified Truck/Bus Technician
Associate Degree
2,740 satisfied customers
Bought a 2000 monaco motorhome in Nov. 2013 and it sat in Florida
Bought a 2000 monaco motorhome in Nov. 2013 and it sat in Florida until two days ago. Chassis batts were dead so replaced them and it fired right up. Seems to run good but lots of black smoke from exh… read more
Wayne
Wayne
Journeyman
Vocational, Technical or Trade Scho
4,023 satisfied customers
2001 FL70 Freightliner, Cummins: Has no power, starts and runs
2001 FL70 Freightliner, Cummins: Has no power, starts and runs great, doesn't miss, doesn't smoke but when under a load, it has no power. Every since the check engine came on I've had this problem. Ha… read more
spankyjr1
spankyjr1
Retired
Vocational, Technical or Trade Scho
420 satisfied customers
05 cummins m11 excesive blow by imediatly from cold start and
05 cummins m11 excesive blow by imediatly from cold start and when hot pours oil out blow by can fill gallon jug in about 30 minutes, inframed engine and rebuilt head and it still does it, with no smo… read more
spankyjr1
spankyjr1
Retired
Vocational, Technical or Trade Scho
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I have an N14 Cummins, in January it was rebuilt by my regular
I have an N14 Cummins, in January it was rebuilt by my regular mechanic and it ran perfect. a couple months ago I had a problem and a Cummins shop replaced my ECM, injectors and alternator. 4 weeks ag… read more
cumminsdr
cumminsdr
Mechanic
High School or GED
1,700 satisfied customers
Eldorado National Rea 37: I have a party bus with a cummins
I have a party bus with a cummins 8.3 deisel. It ran fine for a few hours last night then it lost power, was running rough. By the time the run was over it was maxing out at 15 mph chugging, and blowi… read more
spankyjr1
spankyjr1
Retired
Vocational, Technical or Trade Scho
420 satisfied customers
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Meet the Experts:

Daniel Wilson

Daniel Wilson

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Owner at DJ 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

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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

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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