Medium and Heavy Trucks

Have truck repair questions? Ask an Expert

Connect one-on-one with {0} who will answer your question

Related Medium and Heavy Trucks Questions
2001 GMC with a 3126 engine. After warming up the engine
2001 GMC with a 3126 engine. After warming up the engine looses power and will drop to 20 MPH climbing hills. I checked fuel pressure at an idle and its around 75 PSI. I left the gauge on and drove th… read more
Steven
Steven
Shop Foreman/Triage Tech
Associates
2,384 satisfied customers
I have a 99 3126b that after reaching operating operating
I have a 99 3126b that after reaching operating operating temp, with good oil psi, after sitting 15 min. cranks hard to restart. I've replaced the low psi oil pump (Got great psi after that), fuel fil… read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
4,965 satisfied customers
I have a cat d5n with a 3126 Huey system. Ran fine
I have a cat d5n with a 3126 Huey system. Ran fine yesterday. It will only turn over today. If you spray a little either to it it will crank but not run good… read more
catmastertech
catmastertech
Field service technician
Vocational, Technical or Trade Scho
1,297 satisfied customers
I have a Cat 3126 on a Freightliner RV chassis. Last week my
I have a Cat 3126 on a Freightliner RV chassis. Last week my check engine light came on twice after idleing at a stop light. I took it to Western States Kalispell for a lube service and to read the co… read more
Steven
Steven
Shop Foreman/Triage Tech
Associates
2,384 satisfied customers
2007 C7 cat. 0 power on hills. Skips at full throttle leaves
2007 C7 cat. 0 power on hills. Skips at full throttle leaves me doing 3 mph. But most of time just lacks a little power … read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
4,965 satisfied customers
Has code PID 164 FMI 11. 2002 chevrolet Kodiak w 3126 cat.
put a huei pump on had no fuel pressure before now have pressure but has this code … read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
4,965 satisfied customers
2006 Freightliner c13 cat oil pressure shot up to 75 going
2006 Freightliner c13 cat oil pressure shot up to 75 going down the road bout a week ago but it would come back to normal... back and forth.... now it's tryna read low bout 20 idling and 30 going down… read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
4,965 satisfied customers
C-7 cat low oil pressure, has 20 lbs on cold crank, 10 psi
c-7 cat low oil pressure, has 20 lbs on cold crank, 10 psi warm, new oil pump main rod barings, new injectors, new injection control pressure sensor, new bypass in filter housing, all with no change t… read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
4,965 satisfied customers
Have an FL 80 Freightliner with 3126 engine that is
Have an FL 80 Freightliner with 3126 engine that is experiencing intermittently severe power loss. After sitting and cooling off power level return to normal levels only to relapse in an hour or two o… read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
4,965 satisfied customers
1997 Freightliner FL70 with 3126 Cat Engine and Automatic
1997 Freightliner FL70 with 3126 Cat Engine and Automatic Transmission.The Water\Oil light is coming on intermittently along with a buzzer. Can someone help me trouble shoot this? I don't want to arbi… read more
FIX-IT
FIX-IT
Comercial transport technician
Vocational, Technical or Trade Scho
829 satisfied customers
I've got injectors leaking, won't build up gh pressure. Have
I've got injectors leaking, won't build up high pressure. Have replaced sensor, valve, and huei pump, replaced all 6 injectors, and now # ***** is leaking oil again and won't start. No pressure.… read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
4,965 satisfied customers
cat man please 2002 cat 3126 lost oil pressure but is still
cat man please 2002 cat 3126 lost oil pressure but is still running. Driver stated it felt low on power going up hill, as he was watching the tac the oil pressure started to drop first to half and the… read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
4,965 satisfied customers
I HAVE A 2000 FREIGHTLINER WITH A 3126 CAT ENGINE-NO START
I HAVE A 2000 FREIGHTLINER WITH A 3126 CAT ENGINE-NO START CONDITION,CRANKS BUT WILL NOT STAY RUNNING,DIAG METHOD FOR HIGH PRESSURE OIL CIRCUIT.TRUCK CUT OFF WHILE DRIVING DOWN HIGHWAY.… read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
4,965 satisfied customers
Caterpillar 3126/C7 Engine Issues. The following enine is in
Caterpillar 3126/C7 Engine Issues. The following enine is in the shop with failure issues. Can you advise as to perhaps why engine has continual engine issues? Here is a history of engine issues in th… read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
4,965 satisfied customers
What is making the huei pump only produce 500 psi until I unplug
What is making the huei pump only produce 500 psi until I unplug the injection control pressure sensor on top the head. With it unplugged the huei pump will put out 5000psi… read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
4,965 satisfied customers
catman,your the best,once again im having issues on the 04
catman,your the best,once again im having issues on the 04 chev c6500 3126 cat. either its bad o-rings on the injectors again or the cups or o-rings below the injectors. i know before you said a bad h… read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
4,965 satisfied customers
04 CHEV 6500 W/CAT 3126 ,ALLISON TRANS (TRANS WAS JUST REBUILT.
04 CHEV 6500 W/CAT 3126 ,ALLISON TRANS (TRANS WAS JUST REBUILT. 420777 MILES, I BELIEVE I HAVE #1 INJECTOR BAD ,O-RINGS BAD -DIESEL IN OIL ,OIL IN DIESEL. I MAY START IT UP LOW POWER LIGHT MAY GO ON, … read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
4,965 satisfied customers
thank you i can imagine that is probably the case ... now
thank you i can imagine that is probably the case ... now if the presure regulator is good .. should the fuel presure flucuate between 65 and 85 or be at a steady presure?also as far as you can tell f… read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
4,965 satisfied customers
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.

JustAnswer in the News:

Ask-a-doc Web sites: If you've got a quick question, you can try to get an answer from sites that say they have various specialists on hand to give quick answers... Justanswer.com.
JustAnswer.com...has seen a spike since October in legal questions from readers about layoffs, unemployment and severance.
Web sites like justanswer.com/legal
...leave nothing to chance.
Traffic on JustAnswer rose 14 percent...and had nearly 400,000 page views in 30 days...inquiries related to stress, high blood pressure, drinking and heart pain jumped 33 percent.
Tory Johnson, GMA Workplace Contributor, discusses work-from-home jobs, such as JustAnswer in which verified Experts answer people’s questions.
I will tell you that...the things you have to go through to be an Expert are quite rigorous.

What Customers are Saying:

Wonderful service, prompt, efficient, and accurate. Couldn't have asked for more. I cannot thank you enough for your help.

Mary C.Freshfield, Liverpool, UK

This expert is wonderful. They truly know what they are talking about, and they actually care about you. They really helped put my nerves at ease. Thank you so much!!!!

AlexLos Angeles, CA

Thank you for all your help. It is nice to know that this service is here for people like myself, who need answers fast and are not sure who to consult.

GPHesperia, CA

I couldn't be more satisfied! This is the site I will always come to when I need a second opinion.

JustinKernersville, NC

Just let me say that this encounter has been entirely professional and most helpful. I liked that I could ask additional questions and get answered in a very short turn around.

EstherWoodstock, NY

Thank you so much for taking your time and knowledge to support my concerns. Not only did you answer my questions, you even took it a step further with replying with more pertinent information I needed to know.

RobinElkton, Maryland

He answered my question promptly and gave me accurate, detailed information. If all of your experts are half as good, you have a great thing going here.

DianeDallas, TX

< Previous | Next >

Meet the Experts:

Daniel Wilson

Daniel Wilson

3,632 satisfied customers

Owner at DJ Wilson

Cat Man

Cat Man

Cat Engine Expert

4,965 satisfied customers

I am ASE Master Truck Certified.

Wayne

Wayne

Journeyman

3,400 satisfied customers

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

Jeremy

Jeremy

Certified Truck/Bus Technician

2,672 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

1,458 satisfied customers

All types of Cummins applications

Chris (aka-Moose)

Chris (aka-Moose)

Technician

149 satisfied customers

16 years of experience

dieseldan55

dieseldan55

Contractor

77 satisfied customers

Road Service mechanic for Volvo Construction.

< Previous | Next >

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.

Show MoreShow Less

Ask Your Question

x