Medium and Heavy Trucks

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I have a 2004 Cummins ISX RV with 48k miles that's losing
I have a 2004 Cummins ISX RV with 48k miles that's losing coolant. What could be the issue? I did the exhaust gas test, and it did turn from blue to green. Is this head gasket, or something else?… read more
cumminsdr
cumminsdr
Mechanic
High School or GED
4,300 satisfied customers
Cummins N14 Celect poor fuel milage,strugles to get moving
Cummins N14 Celect poor fuel milage,strugles to get moving when loaded. It's so weak that i cant even slide the tandems on my trailer,it just jumps and dies. Been to many shops and changed almost all … read more
Mike Mcmillan
Mike Mcmillan
Triage Tech/Shop Foreman
Associates
431 satisfied customers
I have a isx Cummins 2006, 870. Crate engine, no egr or egr
I have a isx Cummins 2006, 870. Crate engine, no egr or egr cooler. Had a delete kit installed on motor upon installation, used all my externals from previous motor since they were pretty much new exc… read more
Mike Mcmillan
Mike Mcmillan
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We put stainless injector cups with new injectors in a 2015
We put stainless injector cups with new injectors in a 2015 MP8 engine. We have all the trim codes programmed and it still will not crank. Turns over fine and the system is primed any help? … read more
Mike Mcmillan
Mike Mcmillan
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2002 dt466. starts easily, idles for a while then dies. must
2002 dt466. starts easily, idles for a while then dies. must idle for 15 minutes or engine dies on exceleration, blows white smoke. Replaced both filters. I was convinced I had some bad fuel. I cut op… read more
Mike Mcmillan
Mike Mcmillan
Triage Tech/Shop Foreman
Associates
431 satisfied customers
I have a 2007 Volvo vnl with a 2006 Cummins isx15 cm870. It
I have a 2007 Volvo vnl with a 2006 Cummins isx15 cm870. It started making loud whistle noise when turbo spools,does not have any leaks anywhere...I checked everything,just has a loud whistle and gets… read more
Mike Mcmillan
Mike Mcmillan
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Associates
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Ever had a fire started from a red hot turbo charger, and a
Ever had a fire started from a red hot turbo charger, and a gas leak inside the building at the optimum %. … read more
Curtis B.
Curtis B.
Technician
Associate Degree
1,571 satisfied customers
Following up with regen issue since ecm update Still won't
Following up with regen issue since ecm update Still won't regen Exhaust has pressure is 160in-hg. Should be 120-140 Intake manifold pressure is 19in-hg. Should be 10-14 What causes this… read more
Roy Belding
Roy Belding
7,587 satisfied customers
Dr. Cummins, what is book time for a head gasket job on
Dr. Cummins, what is book time for a head gasket job on 79372036? Does it include checking the deck for flat and liner protrusion?… read more
cumminsdr
cumminsdr
Mechanic
High School or GED
4,300 satisfied customers
Have a 2007 peterbilt with cummins ISX. Starts runs fine,
Have a 2007 peterbilt with cummins ISX. Starts runs fine, good power, no smoke, no misses. The pyro gauge is reading 1300 degrees with typical being in the 1000 to 1100 range. Typical loads. flatland.… read more
Dorian Conley
Dorian Conley
Heavy Duty Diesel Engine Technician
Vocational, Technical or Trade School
Cummins 400 ISl Oil Spray Just picked motorhome up from
Cummins 400 ISl Oil Spray Just picked motorhome up from repair shop after: air dryer filter replaced, turbocharger replaced, new oil, oil filter, air filter and front cover resealed. Drove 25 miles an… read more
cumminsdr
cumminsdr
Mechanic
High School or GED
4,300 satisfied customers
Isx 2009 won't get hot enough to do a regen turbo was
Isx 2009 won't get hot enough to do a regen turbo was replaced about 5 month ago the egregious different pressure. is .2-.4 egregious open 0 Exh press 140-160 intake manifold press 22.6-24.6 turbo act… read more
cumminsdr
cumminsdr
Mechanic
High School or GED
4,300 satisfied customers
My c15 has high exhaust gas temps. With an empty trailer on
My c15 has high exhaust gas temps. With an empty trailer on a slight uphill it will reach 950 degrees F. The truck does have a fuel air seperator.… read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
5,234 satisfied customers
I have a 2004 c15 bridge 625 with a cat 525 program we put
Hello, I have a 2004 c15 bridge 625 with a cat 525 program we put in computer. I have a problem with the egt going high when driving in temperatures above 82 degrees. seems like any boost above 20 lbs… read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
5,234 satisfied customers
Cummins dr do you know the location of the EGR VALVE
Hello cummins dr do you know the location of the EGR VALVE on a international prostar 2009 cummins isx engine? Whould you have an image of what the assembly looks like?… read more
cumminsdr
cumminsdr
Mechanic
High School or GED
4,300 satisfied customers
I have 2008 freightliner 6.7 cummins dtc 68 secondary turbo
I have 2008 freightliner 6.7 cummins dtc 68 secondary turbo inlet pressure . fault mode. data valid but above normal operational range… read more
cumminsdr
cumminsdr
Mechanic
High School or GED
4,300 satisfied customers
Dear Dr. CumminsI have a 2007 f650 rollback with a 5.9 cummins
Dear Dr. Cummins I have a 2007 f650 rollback with a 5.9 cummins and allison trans. Check engine light comes on pulling long hills, especially when loaded. I have to lift off the throttle to make light… read more
Wayne
Wayne
Journeyman
Vocational, Technical or Trade Scho
4,023 satisfied customers
I have a 1999 Cummins 5.9B inline 6 with a power issue. It
I have a 1999 Cummins 5.9B inline 6 with a power issue. It will only go to 15MPH unless you keep pumping the accelerator hard and then it will go 35MPH running very poorly. It runs better with the pre… read more
cumminsdr
cumminsdr
Mechanic
High School or GED
4,300 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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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

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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.

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)

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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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