Medium and Heavy Trucks

Have truck repair questions? Ask an Expert

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

This answer was rated:

I have a 2004 Kenworth T 800 with a Catapillar C 15 that was…

Hi I have a 2004...
Hi I have a 2004 Kenworth T 800 with a Catapillar C 15 that was recently just rebuilt about 1000 miles ago that fixed the major issues that we we're having. But we're still having an underlying issue that was going on before the truck stumbles at idle sometimes and will stumble upon acceleration The truck will catch itself and run great. Any ideas the driver says it does it more under three quarters of a tank of fuel.... I seem to think because the motor is hot by the time it's at three quarters of a tank and that's when it starts acting up air in the fuel? thanks in advance
Show More
Show Less
Ask Your Own Medium and Heavy Trucks Question
Answered in 8 hours by:
4/29/2017
Technician: Cat Man, Cat Engine Expert replied 5 years ago
Cat Man
Cat Man, Cat Engine Expert
Category: Medium and Heavy Trucks
Satisfied Customers: 10,344
Experience: I am ASE Master Truck Certified.
Verified
Thanks for asking your question. I will try and help you out. Has the fuel pressure been checked when this happens? Does the engine smoke out the exhaust when this happens? Were the injectors and Iva housings changed with the rebuild?
Ask Your Own Medium and Heavy Trucks Question
Customer reply replied 5 years ago
Fuel pressure hasn't been checked motor has plenty of top end power so we figured it had plenty of pressure I was thinking air in the fuel. And no injectors are all original noting changed except new cups and o rings wasn't told about this issue before the rebuild so we kept injectorsno to the Iva housingthis motor is and MBN single turbo didn't just the averts have the Iva housing?
Technician: Cat Man, Cat Engine Expert replied 5 years ago
you are correct. MBN has no iva. If you have good power. I would not suspect fuel pressure is low. I must suspect a faulty injector. The tough part is it's hard to determine which injector is causing this.
Ask Your Own Medium and Heavy Trucks Question
Customer reply replied 5 years ago
Yea that's what I was thinking especially because it can be one or more... can air in the fuel cause this? Like possibly a pick up tube issue cause it gets worse as the fuel level drops?
Technician: Cat Man, Cat Engine Expert replied 5 years ago
it's possible it's sucking air. But normally when it's sucking air the engine has low power.
Ask Your Own Medium and Heavy Trucks Question
Customer reply replied 5 years ago
Okay well I'll check it just to see and maby an low rpm fuel issue?I don't have access to cat ET you have any recommendations as to how to track the misfire the over head was just ran on over haul could it be jakes acting up?
Technician: Cat Man, Cat Engine Expert replied 5 years ago
it's possible a jake is causing this. You can try backing off the jake adjustment. The only other way to try and verify a miss without ET is to unplug each injector one at s time.
Ask Your Own Medium and Heavy Trucks Question
Technician: Cat Man, Cat Engine Expert replied 5 years ago
Hey. I just wanted to see how things were going. Please let me know if you need more help. I am happy to assist. If my information was helpful, please leave a good or higher rating so that I receive credit. Thanks.
Cat Man
Cat Man, Cat Engine Expert
Category: Medium and Heavy Trucks
Satisfied Customers: 10,344
Experience: I am ASE Master Truck Certified.
Verified
Cat Man and 87 other Medium and Heavy Trucks Specialists are ready to help you
Ask your own question now
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 Cat Man Your Own Question
Cat Man
Cat Man
Cat Man, Cat Engine Expert
Category: Medium and Heavy Trucks
Satisfied Customers: 10,344
10,344 Satisfied Customers
Experience: I am ASE Master Truck Certified.

Cat Man is online now

Related Medium and Heavy Trucks Questions
How you doing I have a 2002 Peterbilt with a C15 cat and on
How you doing I have a 2002 Peterbilt with a C15 cat and on a hot day at wide open throttle it act like it's running out of fuel but it doesn't ever die if you back off the throttle it will surge for … read more
Nich1019
Nich1019
Diesel Technician
Vocational, Technical or Trade School
64 satisfied customers
I am looking into buying a 2006 kenworth 900L. It has a mxs
Hello! I am looking into buying a 2006 kenworth 900L. It has a mxs C-15 acert EPA 04. A FRIEND OWNS THE TRUCK NOW, the engine just had a platinum rebuild with paperwork and 3 year warrenty. I have hea… read more
Nich1019
Nich1019
Diesel Technician
Vocational, Technical or Trade School
64 satisfied customers
I have an 1982 Kenworth with a 3406A model Caterpillar
I have an 1982 Kenworth with a 3406A model Caterpillar engine serial number 92U28665 when cold runs and drive great but one warmed up cuts out and acts like running out of fuel… read more
Daniel Wilson
Daniel Wilson
Auto Mechanics 1&2/diesel mech
6,062 satisfied customers
2014 Kenworth T 800 with a Cummins ISX 15 in it using half a
2014 Kenworth T 800 with a Cummins ISX 15 in it using half a gallon of coolant a day, no visible leaks radiator overflow tank under a enormity pressure ,radiator hoses bulging, help to diagnose… read more
Mike Mcmillan
Mike Mcmillan
Triage Tech/Shop Foreman
Associates
591 satisfied customers
Have a cat 3126 that starts fine but runs a bit rough until
Have a cat 3126 that starts fine but runs a bit rough until warmed up, then runs perfect all day no check engine light. Recent work speed sensors replaced, orings, injector cups, ipr. No big deal just… read more
Daniel Wilson
Daniel Wilson
Auto Mechanics 1&2/diesel mech
6,062 satisfied customers
I drive a 2001 Kenworth t600 n14 Eaton 10 speed when I drive
I drive a 2001 Kenworth t600 n14 Eaton 10 speed when I drive loaded or un loaded on my high gears 7-10 don't have power I replaced two fuel filters and a fuel line and nothing change … read more
Wayne
Wayne
Journeyman
Vocational, Technical or Trade Scho
5,115 satisfied customers
I have 2006 Freightliner Columbia just recently rebuilt
I have 2006 Freightliner Columbia just recently rebuilt engine and also put new harness for ECM. … read more
Anthony Young
Anthony Young
Associates in Diesel Technology
2 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
10,344 satisfied customers
Air conditioning issues. 2001 kenworth t 800 caterpillar
I don't know what to try not my truck but if I wait for company mechanics it will be winter … read more
Andy
Andy
truck /coach technician
Vocational, Technical or Trade School
214 satisfied customers
I have a 2009 Volvo with a d13, The problem I'm having is:
Good morning ! I have a 2009 Volvo with a d13, The problem I'm having is: … read more
Mike Mcmillan
Mike Mcmillan
Triage Tech/Shop Foreman
Associates
591 satisfied customers
If my heui pump on my cat c7 has a light paste of metal
If my heui pump on my cat c7 has a light paste of metal shavings is it absolutely necessary to replace all 6 injectors along with heui pump … read more
Aaron Evans
Aaron Evans
MOBILE FLEET MANAGER
44 satisfied customers
I have a 2006 Kenworth T 800 with a cat C-13 The truck is
I have a 2006 Kenworth T 800 with a cat C-13 The truck is having issues where is randomly shutting down sometimes one time a day sometimes three times a morning... it has been to cat three times the r… read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
10,344 satisfied customers
I am considering purchasing a few Trucks that have Jpro
I am considering purchasing a few Trucks that have Jpro diagnostic reports done on them however a vast majority of the fault codes say inactive??? Does this mean the issues have been dealt with or tha… read more
cumminsdr
cumminsdr
Mechanic
High School or GED
1,886 satisfied customers
why does my 05 kenworth with a isx Cummings act like it is
why does my 05 kenworth with a isx Cummings act like it is gelled when it gets 20 degrees outside… read more
Andy
Andy
truck /coach technician
Vocational, Technical or Trade School
214 satisfied customers
2006 Pete with CAT C7. Truck has a fresh rebuild less than
2006 Pete with CAT C7. Truck has a fresh rebuild less than 200 hr ago. Truck was driving and had a sudden loss of power and they had trouble getting it up to 15 mph, (OF COURSE THAT IS WHAT MY DRIVER … read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
10,344 satisfied customers
On a DD 15 (2009) will the fuel filters catch the tiny metal
On a DD 15 (2009) will the fuel filters catch the tiny metal flecks from the grinder after having my tank shortened & replaced.The job was done 5 months ago w no problem but the first time I ran the f… read more
Wayne
Wayne
Journeyman
Vocational, Technical or Trade Scho
5,115 satisfied customers
Okay Jeremy, giving you another question. Give me your opinion
Okay Jeremy, giving you another question. Give me your opinion on the following trucks based on mpg and relability, they will have varied uses and drive to 48 states. Also, assume all are in the like … read more
Jeremy
Jeremy
Certified Truck/Bus Technician
Associate Degree
2,756 satisfied customers
I have a Kenworth T800 dump with a Cummings N14plus motor.
I have a Kenworth T800 dump with a Cummings N14plus motor. Truck will not start. We have recently replaced the fuse and the sending unit in the fuel tank, but still cannot get the truck to start. What… read more
cumminsdr
cumminsdr
Mechanic
High School or GED
1,886 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

6,062 satisfied customers

Owner at DJ Wilson

Cat Man

Cat Man

Cat Engine Expert

10,344 satisfied customers

I am ASE Master Truck Certified.

Wayne

Wayne

Journeyman

5,115 satisfied customers

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

Jeremy

Jeremy

Certified Truck/Bus Technician

2,756 satisfied customers

ASE Med/HD Truck Technician, NATEF Diesel Engines and Electrical/Electronics Technician, Network Engineer specializing in CAN faults, Aftertertreatment, and vehicle communications

Curtis B.

Curtis B.

Technician

1,947 satisfied customers

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

cumminsdr

cumminsdr

Mechanic

1,886 satisfied customers

All types of Cummins applications

Chris (aka-Moose)

Chris (aka-Moose)

Technician

641 satisfied customers

24 years of experience diagnosing & repairing

< 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