Medium and Heavy Trucks

Have truck repair questions? Ask an Expert

Ask an Expert,
Get an Answer ASAP!

1990 Cummins 8.3 engine hunts what a highway speeds and it…

Customer Question
1990 Cummins 8.3 engine...

1990 Cummins 8.3 engine hunts what a highway speeds and it wide open throttle no load on Engine

Mechanic's Assistant: What is the complete model and serial number of your machine?

Model # 6cta-8 sear #44365508

Mechanic's Assistant: Are you fixing this yourself? What have you tried so far?

We checked for air leaks from the fuel tank to the injector pump no leaks we check the injector pump timing it's on 16° App and afr diaphragm

Submitted: 11 months ago.Category: Medium and Heavy Trucks
Show More
Show Less
Ask Your Own Medium and Heavy Trucks Question
Customer reply replied 11 months ago
Posted by JustAnswer at customer's request) Hello. I would like to request the following Expert Service(s) from you: Live Phone Call.
Customer reply replied 11 months ago
Let me know if you need more information, or send me the service offer(s) so we can proceed.
Answered in 6 hours by:
7/31/2017
Technician: Daniel Wilson,
 replied 11 months ago
Daniel Wilson
Category: Medium and Heavy Trucks
Satisfied Customers: 6,797
Experience: Owner at DJ Wilson
Verified

Hi my name is***** will be glad to try to help. Install a sight glass or clear hose in between the tank and pump to monitor for air bubbles and also check your fuel pressure with a gauge and verify if the pressure fluctuates or is constant and withing specs. Let me know the results.

Ask Your Own Medium and Heavy Trucks Question
Customer reply replied 11 months ago
We are already tried that we checked everything no bubbles has proper fuel pressure within specs
Technician: Daniel Wilson,
 replied 11 months ago

If no air, restrictions, or leaks in the supply fuel system then it points to an internal problem with the injection pump itself. Let me know

Ask Your Own Medium and Heavy Trucks Question
Technician: Daniel Wilson,
 replied 10 months ago

Hi, Did you get this resolved?If so, Please take a moment to rate as that is how the site credits my time helping on the site or let me know if you need more help. 5 star and bonuses are always greatly appreciated.

Ask Your Own Medium and Heavy Trucks Question
Was this answer helpful?

How JustAnswer works

step-image
Describe your issueThe assistant will guide you
step-image
Chat 1:1 with a technicianLicensed Experts are available 24/7
step-image
100% satisfaction guaranteeGet all the answers you need
Ask Daniel Wilson Your Own Question
Daniel Wilson
Daniel Wilson
Daniel Wilson
Category: Medium and Heavy Trucks
Satisfied Customers: 6,797
6,797 Satisfied Customers
Experience: Owner at DJ Wilson

Daniel Wilson is online now

A new question is answered every 9 seconds

How JustAnswer works:

  • Ask an ExpertExperts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional AnswerVia email, text message, or notification as you wait on our site. Ask follow up questions if you need to.
  • 100% Satisfaction GuaranteeRate the answer you receive.

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

6,797 satisfied customers

Owner at DJ Wilson

Cat Man

Cat Man

Cat Engine Expert

4,493 satisfied customers

I am ASE Master Truck Certified.

Wayne

Wayne

Journeyman

2,869 satisfied customers

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

Jeremy

Jeremy

Certified Truck/Bus Technician

2,235 satisfied customers

ASE Med/HD Truck Technician, NATEF Diesel Engines and Electrical/Electronics Technician, EPA 608/609 HVAC Certified, Steering/Suspension and ABS/Brakes Technician

cumminsdr

cumminsdr

Mechanic

1,337 satisfied customers

All types of Cummins applications

Curtis B.

Curtis B.

Technician

961 satisfied customers

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

dieseldan55

dieseldan55

Contractor

74 satisfied customers

Road Service mechanic for Volvo Construction.

< Previous | Next >

Related Medium and Heavy Trucks Questions
Fuel Injector Setting. 1981 - 6-92. Just need Injector
Fuel Injector Setting JA: What's the make/model/year of your truck? Engine type? Customer: 1981 - 6-92 JA: Are you fixing your truck yourself? What have you tried so far? Customer: Yes, Just need Inje… read more
Curtis B.
Curtis B.
Technician
Associate Degree
961 satisfied customers
Cummins N14 fuel in the oil? we have every part of the fuel
cummins N14 fuel in the oil ? we have every part of the fuel system !new heads, injectors, and so on what else could be the issue … read more
timdieseltech
timdieseltech
diesel tech
Vocational, Technical or Trade School
85 satisfied customers
Cummins V8 eng. number 20119371 what is the cu in. Huber
what year is the grader and what type is the transmission… read more
cumminsdr
cumminsdr
Mechanic
High School or GED
1,337 satisfied customers
What is the firing order and how many degrees before top
what is the firing order and how many degrees before top dead center do you set thepumpat … read more
Daniel Wilson
Daniel Wilson
6,797 satisfied customers
2011 t700 kenworth isx clutch will not engage has prower but
2011 t700 kenworth isx clutch will not engage has prower but no ground looked for relay could'nt find it . … read more
Wayne
Wayne
Journeyman
Vocational, Technical or Trade Scho
2,869 satisfied customers
I've got a kta50 Cummins it has been overhauled recently
Hi I've got a kta50 Cummins it has been overhauled recently I've startet machine but only one side of bank(rh) is firing,can u please help,I've chanced the diesel pump,checked the rail replaced all in… read more
Curtis B.
Curtis B.
Technician
Associate Degree
961 satisfied customers
I workin on a e6 350 mack dinatard how do i adjust the
Hey i workin on a e6 350 mack dinatard how do i adjust the valves … read more
Wayne
Wayne
Journeyman
Vocational, Technical or Trade Scho
2,869 satisfied customers
2014 FORD F750 WITH ISB CUMMINS. NO CRANK NOT SHOWING GEAR
2014 FORD F750 WITH ISB CUMMINS. NO CRANK NOT SHOWING GEAR INDICATION THRU ALLISON NOR WILL ALLISON TCM COMMUNICATE. I NEED A DIAGRAM OF THE IGNITION CIRCUIT. TRIED TEST TCM, TEST VIM, NEUTRAL DETENT … read more
Daniel Wilson
Daniel Wilson
6,797 satisfied customers
My truck is a freightliner condor with 2007 isl cummins
My truck is a freightliner condor with 2007 isl cummins engine. I now need to use the fuel primer pump each time I start the engine. The truck will not start without priming. What would cause this to … read more
William Herren
William Herren
A.A.S.
2 satisfied customers
I am working on a ford f750, with a 5.9 cummins engine, I and
I am working on a ford f750, with a 5.9 cummins engine, I and getting a low fuel pressuer code, using a pro link hds1708, I do not have the program for cummins. the only thing is PID 94 + FMI -1. I ha… read more
Daniel Wilson
Daniel Wilson
6,797 satisfied customers
Need code engine 2007 c13 broke down loaded with hogs need
Need code for cat engine 2007 c13 broke down loaded with hogs need to clear codes to regeneration… read more
Bradley Martin
Bradley Martin
16 satisfied customers
I have a 2007 volvo with a cummins 450 motor, automatic
I have a 2007 volvo with a cummins 450 motor, automatic transmission cannot start truck with key,get absolutely nothing,but can jump it from ignition soleniod to start but no power to transmission. wh… read more
Daniel Wilson
Daniel Wilson
6,797 satisfied customers
I have a cummins ISX and is smoking a lot smoke I do
I have a cummins ISX and is smoking a lot white smoke I do regeneration every 2 days I ready clean the filter or DPF I change the Atf injector the turbo still having this problem… read more
Daniel Wilson
Daniel Wilson
6,797 satisfied customers
I have a 98 international 444 or a 7.3 have fuel pressure
I have a 98 international 444 or a 7.3 have fuel pressure replaced fuel air icp cam position sensor lift pump checked for air leaks I nspected turbo pressure tested radiator ran alternate fuel source … read more
Expert
Expert
I installed a fan over ride at my prostar powered by cummins
Hi my name is***** installed a fan over ride at my prostar powered by cummins and I touched a thick red wire which is going in the cab and a saw a short circuit,i think is comming from ecm ,and now I … read more
Andy3221
Andy3221
truck /coach technician
Vocational, Technical or Trade Scho
222 satisfied customers
My wife is driving through Colorado with a 99 pete Scwabe
My wife is driving through Colorado with a 99 pete Scwabe conversion. Has a Cummins 8.3 (285 hp ?) there is a red cap with a blue back that looks like it has been disconnected. Looks like its a coolan… read more
FIX-IT
FIX-IT
Comercial transport technician
Vocational, Technical or Trade Scho
784 satisfied customers
I have a freight liner cascadia 2009 truck. right now code
Hello i have a freight liner cascadia 2009 truck. right now code showing ENG RSRVC 128s 371 14 comes with check light and check engine sign came in and also truck ABS light coming . all light and code… read more
roy
roy
Associate Degree
3 satisfied customers
I have a 2007 six motor,an my temp Gage going like up to 235to240,an
I have a 2007 six motor,an my temp Gage going like up to 235to240,an my loads is usely like 45000,an I'm not climbing no hills… read more
Wayne
Wayne
Journeyman
Vocational, Technical or Trade Scho
2,869 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.

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