Medium and Heavy Trucks

Have truck repair questions? Ask an Expert

Ask an Expert,
Get an Answer ASAP!

I have a 05 379 I am having problems with the engine not…

Customer Question
I have a 05 379...
I have a 05 379 I am having problems with the engine not picking up the throttle position acts like it wants to but just cant. (Sometimes) it acts like it's starving for fuel and starts fluttering and shaking . At the same time the air dryer will spit @ 100 lbs and will do a full purge @ 120. When this all goes on it puts considerable drag on the engine. It feels like it is fighting itself and recently the abs light comes on and goes off. Humidity and wet weather make symptoms worse as long as it stays in a stable environment it works well. I'm thinking fuse panel or something like that?
Submitted: 2 years ago.Category: Medium and Heavy Trucks
Show More
Show Less
Ask Your Own Medium and Heavy Trucks Question
Customer reply replied 2 years ago
Posted by JustAnswer at customer's request) Hello. I would like to request the following Expert Service(s) from you: Live Phone Call. Let me know if you need more information, or send me the service offer(s) so we can proceed.
Answered in 48 minutes by:
3/3/2016
Technician: Daniel Wilson,
 replied 2 years ago
Daniel Wilson
Category: Medium and Heavy Trucks
Satisfied Customers: 6,770
Experience: Owner at DJ Wilson
Verified

Hi Tammy. My name is***** will be glad to help. What is the make , model and serial of the engine?

Ask Your Own Medium and Heavy Trucks Question
Technician: Daniel Wilson,
 replied 2 years ago

For initial checks, check the fuel lines between the tank and pump for leaks or restrictions indicating a loss of fuel supply pressure and sucking in air. Install a sight glass or clear hose to check for bubbles indicating air in the system. Let me know what engine make and model so I can give you details on the engine checks whether it is Cat C15, Cummins ISX, Detroit...??? Let me know

Ask Your Own Medium and Heavy Trucks Question
Technician: Daniel Wilson,
 replied 2 years ago

Hi, It appears there is some technical difficulty. Let me know if you can see my responses

Ask Your Own Medium and Heavy Trucks Question
Technician: Daniel Wilson,
 replied 2 years ago

I can provide with some schematics and troubleshooting info to help once I get your engine information.

Ask Your Own Medium and Heavy Trucks Question
Customer reply replied 2 years ago
Bsx25790 did everything u suggested. All was ok.
Customer reply replied 2 years ago
C15
Technician: Daniel Wilson,
 replied 2 years ago

What are the first three characters of the engine serial number?

Ask Your Own Medium and Heavy Trucks Question
Technician: Daniel Wilson,
 replied 2 years ago

Is the check engine light coming on at all?

Ask Your Own Medium and Heavy Trucks Question
Technician: Daniel Wilson,
 replied 2 years ago

Click here for your schematics.

Schematics

Ask Your Own Medium and Heavy Trucks Question
Technician: Daniel Wilson,
 replied 2 years ago

Check your fuel pressure with a gauge. Should be 75-90 PSI consistent even under a load. If low your could have a faulty pressure regulator or transfer pump. The other cause is faulty injectors if high mileage. You can have an injector test done with Cat ET connected. Let me know

Ask Your Own Medium and Heavy Trucks Question
Customer reply replied 2 years ago
Have had 2 sets of injectors in. fuel pressure runs 92 running down the road and 89 at a 800 rpm. What is normal turbo boost? I'm only getting about 35. Injector tested ok, but it always runs fine in a stable environment.
Technician: Daniel Wilson,
 replied 2 years ago

That is in range for boost. Are you getting any fault codes? Check engine light come on? Hard starting? you mention when the air compressor is pumping/cut in the symptoms are worse? Or are the symptoms only present when the air compressor is cut in? What is the complete engine model and serial number from the ID tag?

Ask Your Own Medium and Heavy Trucks Question
Customer reply replied 2 years ago
No codes, no lights. Not hard starts cat c15 bsx25790. Doesn't semester to matter if air compressor cuts in or not. Btw new.
Technician: Daniel Wilson,
 replied 2 years ago

If the fuel system checks out ok and there is no codes then check your throttle position sensor for loss of signal and corrosion/poor connections in the harness, Check the ECM power connections between the battery box and ECM for corrosion or loose connections, Check the cam sensor and harness for loss of signal or erratic signal and it would be worth while to read live data with Cat ET connected to monitor what is happening with the sensors etc when this problem occurs. Also reflashing and updating the ECM software for test purposes might not be a bad idea or if you have access to a test ECM. Be sure to check all grounds which could cause a lot of odd things to happen. Let me know

Ask Your Own Medium and Heavy Trucks Question
Customer reply replied 2 years ago
Throttle sensor itself is new. Have had alot of wire issues under cab and between ecm and ignition. Ecm is new (2x) all wiring harnesses from ecm to engine as re new and the harness on cab side of ecm is new. Cam senior is new as well as ambiance air senior and temp sencor. What is a "cat et"? Would I be able to leave it in going down the road for an extended period of time? Grounds have all been checked and cleaned.
Technician: Daniel Wilson,
 replied 2 years ago

Cat ET is the diagnostic software for Caterpillar programmed into a laptop that plugs into the diagnostic connector using a communication adapter between the truck and laptop. If you know a shop that has this or a scan tool that will read live data. The Cat ET setup is pricey. You can go on Ebay and buy a Launch brand reader and if you have time to wait buy it from a China seller to get it at half the money. I got one on my road truck and it works great.

Ask Your Own Medium and Heavy Trucks Question
Customer reply replied 2 years ago
It would have to be connected going down the road and be able to record data for long periods of time. Every time the shop hooks the computer to it everything checks out ok (stable environment) and I can't make it act up.
Customer reply replied 2 years ago
I've been fighting this for 2 years. I've been to 8 different shops. Everybody checks the same things as what you are discribing. But I think you might be on to something with the throttle harness. Seems like when it acts up I push the throttle down and there is nothing there. It will flutter and almost act like it's applying the breaks. It will drop the front end instead of picking it up.
Technician: Daniel Wilson,
 replied 2 years ago

Thanks for the update. Check the engine brake circuit as well. It sounds like you might have the engine brake coming on or sticking when it should not be. Watch to see if this happens with the engine brake turned off.

Ask Your Own Medium and Heavy Trucks Question
Customer reply replied 2 years ago
Circuit was just replaced. Turn Jakes off sometimes it seems to get better other times doesn't make a difference. Could it be effecting the abs? Seems like it wants to pull to the left if it gets bad enough. Had this same problem with my kw with the n14 in it. It's possible I have more than 1 problem but when it runs good all the symptoms go away. I've noticed at its worse the air dryer does not purge
Customer reply replied 2 years ago
It will also steer hard and get a shake. But it gets better if I use lots of air (dump bags, slam on brakes, etc.) Last night it was 20 degrees and dry. It ran good. But was making a howling noise. Seems if the noise is than it doesn't feel like the brakes are applied.
Technician: Daniel Wilson,
 replied 2 years ago

Thanks for the update. I think you have multiple things going on. For the engine, if the fuel system tests good and the injectors test good after being tested with Cat ET software plugged in and they pass then I recommend having the valves, injectors, and jakes adjusted and the jake housings inspected for leaks and possible sticking plungers, etc. With the valve covers off and engine idling you can test the jakes by pressing the center of the solenoid one at a time to see if they are sticking or working properly. As far as your vibration, Check your suspension and steering components, driveline components and input and output yokes for looseness, center bearing, engine and transmission mounts.

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: 6,770
6,770 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

6,770 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
Mileage counter continues to count miles even though I'm
Mileage counter continues to count miles even though I'm parked. … read more
Steven
Steven
Triage Tech/Shop Foreman
Associates
10 satisfied customers
2013 Volvo d13 code sa 0 spn 411 fmi 7. Volvo vnlVolvo d13.
2013 Volvo d13 code sa 0 spn 411 fmi 7 JA: What's the make/model/year of your truck? Engine type? Customer: Volvo vnl(###) ###-####Volvo d13 JA: Are you fixing your truck yourself? What have you tried… read more
Steven
Steven
Triage Tech/Shop Foreman
Associates
10 satisfied customers
Have a Cummins N14 Celect Plus, Throwing codes PID 036 and
Have a Cummins N14 Celect Plus, Throwing codes PID 036 and PID 021 on truck display. Check engine light is on below 1500rpm but goes off and stays off over 1500rpm? Truck still runs perfectly fine. Wh… read more
Jackie Dempsey
Jackie Dempsey
Heavy Line Technician
Automotive and Diesel Engines
96 satisfied customers
I have 3 fault codes. Son 3363 FMI 26; SPN 3365 FMI 16; and
I have 3 fault codes. Son 3363 FMI 26; SPN 3365 FMI 16; and SPN 1569 SMI 26. I have the software updated last month at the West Palm Beach Cummins facility. Earlier this week I had the sending unit in… read more
roy
roy
Associate Degree
3 satisfied customers
2004 Mack ch613 runs good about 15 miles and then it
2004 Mack ch613 runs good about 15 miles and then it flutters and then it shows 6-4 j1939 and then the fan barely moves in the truck kind of gets warm what could be wrong with it … read more
Steven
Steven
Triage Tech/Shop Foreman
Associates
10 satisfied customers
Could I get the injector height for a 3116 2bk25277. 1992
Could I get the injector height for a 3116 2bk25277 … read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
4,493 satisfied customers
I'm looking for my cat engine family code. Engine model is
Hello my name is*****'m looking for my cat engine family code … read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
4,493 satisfied customers
I have a 89 MCI 102 A3 bus, air pressure goes to 90 PSI or
I have a 89 MCI 102 A3 bus, air pressure goes to 90 PSI or 100, move very slowly to 110 it wont go to 125 PSL, I replaced the foot valve, still the same, can you help? … read more
Curtis B.
Curtis B.
Technician
Associate Degree
961 satisfied customers
Low power on my vnl. 2006 volvo vnl d12. My self just rebuil
yes the priming valve in not geting hard when i pump it… read more
Steven
Steven
Triage Tech/Shop Foreman
Associates
10 satisfied customers
X. 2003 mack RD688s e7 etech 350 engine. Will not start, it
2003 mack RD688s e7 etech 350 engine. Will not start, it only cranks. I have eliminated any problem from the fuel tanks. I have a line running from a separate fuel container. I've replaced the Crank sensor and the Engine speed sensor. still no luck … read more
Steven
Steven
Triage Tech/Shop Foreman
Associates
10 satisfied customers
I have a New Holland L 180 which won't move, it was a but
I have a New Holland L 180 which won't move, it was a burnt but not bad it starts, runs and the boom works, I had to replace the instrument cluster and program it … read more
Curtis B.
Curtis B.
Technician
Associate Degree
961 satisfied customers
I like to erase code on Cummins 3.6kyfa-26120p it service
I like to erase code on Cummins 3.6kyfa-26120p it service required … read more
Steven
Steven
Triage Tech/Shop Foreman
Associates
10 satisfied customers
The ram does not return on my log splitter. Speeco
the ram does not return on my log splitter JA: What is the complete model and serial number of your machine? Customer: speeco 1e0600161 JA: Are you fixing this yourself? What have you tried so far? Cu… read more
Curtis B.
Curtis B.
Technician
Associate Degree
961 satisfied customers
I'm getting code 2637 and cannot do a regen. 2012
Hey I'm getting code 2637 and cannot do a regen JA: What's the make/model/year of your truck? Engine type? Customer: 2012 international pro star Cummins isx JA: Are you fixing your truck yourself? Wha… read more
Andy3221
Andy3221
truck /coach technician
Vocational, Technical or Trade Scho
222 satisfied customers
On my cat 272D, the work tool control that locks buckets
on my cat 272D , the work tool control that locks buckets etc. into place has stopped working, I checked all fuses inside the cab , and the switch itself, still cannot diagnosr … read more
catmastertech
catmastertech
Field service technician
Vocational, Technical or Trade Scho
1,287 satisfied customers
I. I have a 2011 frght lnr dd15. Just had ac compressor
just had ac compressor replaced due to reading bad ohm, due to overload it could not actuate clutch w/power probe" air drier was replaced as well. … read more
Andy3221
Andy3221
truck /coach technician
Vocational, Technical or Trade Scho
222 satisfied customers
Stop engine andcheck engine light..code eec 61. 15
Stop engine andcheck engine light..code eec 61 JA: What's the make/model/year of your truck? Engine type? Customer: 15 freightliner cascadia dd15 JA: Are you fixing your truck yourself? What have you … read more
roy
roy
Associate Degree
3 satisfied customers
Before we go further can you tell me how the payment works?
Before we go further can you tell me how the payment works? Thanks Bill … read more
FIX-IT
FIX-IT
Comercial transport technician
Vocational, Technical or Trade Scho
784 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