Medium and Heavy Trucks

Have truck repair questions? Ask an Expert

Ask an Expert,
Get an Answer ASAP!

Mack e7 sputters/ misses when you let it idle than take off.

Customer Question
Mack e7 sputters/ misses...

Mack e7 sputters/ misses when you let it idle than take off. it clears out normally by the first shift or two and runs out normal

Mechanic's Assistant: What's the make/model/year of your truck? Engine type?

2000 e7 427 ch613

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

I had it at a local shop they racked up a large bill and didnt fix it. 6 new injectors, 1 injector solenoid. no trouble codes. i am working on it now in my shop that i have time

Mechanic's Assistant: Anything else you want the truck mechanic to know before I connect you?

It was rebuilt 3 year ago less than 200000 miles

Submitted: 7 months ago.Category: Medium and Heavy Trucks
Show More
Show Less
Ask Your Own Medium and Heavy Trucks Question
Answered in 57 minutes by:
12/14/2017
Technician: Daniel Wilson,
 replied 7 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 help. Install a clear hose or sight glass on the suction and return to look for air bubbles and for leaks or restrictions. This will help to check and isolate a suction or return fuel supply problem. If the return only it points to injector issues or in the head but if before the pump ir points to a supply issue. Monitor the pressure as well. Let me know the results.

Ask Your Own Medium and Heavy Trucks Question
Technician: Daniel Wilson,
 replied 7 months ago

Test the exhaust port temps as well to check for a cold cylinder that would indicate weak combustion.

Ask Your Own Medium and Heavy Trucks Question
Technician: Daniel Wilson,
 replied 7 months ago

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
Customer reply replied 7 months ago
We had a little on suction side a lot on the return so we ran a line straight back to the tank removing any air going in and still have a lot of air on return what do we check next
Technician: Daniel Wilson,
 replied 7 months ago

If a lot on the return but not the suction it points to air or combustion getting in through the injectors.

Ask Your Own Medium and Heavy Trucks Question
Technician: Daniel Wilson,
 replied 7 months ago

If it is in the suction as well it would be passing through to the return.

Ask Your Own Medium and Heavy Trucks Question
Customer reply replied 7 months ago
The air is definitely coming from the head I believe the injectors does it mean anything if all the air is coming out of a rubber line top dead center in the front of valve cover coming out of the head which goes down and ties in the return line work comes out of the block
Technician: Daniel Wilson,
 replied 7 months ago

If none on the suction anymore but on the return it points to an injector issue. Test and reseal the injectors. If around 500k on the injectors replace them.

Ask Your Own Medium and Heavy Trucks Question
Customer reply replied 7 months ago
How do you test the injectors to find out what ones are leaking
Technician: Daniel Wilson,
 replied 7 months ago

An initial test would be to take exhaust port temps to look for a cold cylinder and for signs of wet unburned fuel at the exhaust ports. The other way is to remove them and send them out for a fuel injection shop to test them properly.

Ask Your Own Medium and Heavy Trucks Question
Technician: Daniel Wilson,
 replied 7 months ago

Did this get new injectors 200k ago? If not I would go with 6 new ones without hesitation.

Ask Your Own Medium and Heavy Trucks Question
Technician: Daniel Wilson,
 replied 6 months ago

Hi, Did you get this resolved? 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
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
11 satisfied customers
1992 Mack CH613: When started, will automatically go to 1400
1992 Mack CH613: When started, will automatically go to 1400 RPM and continue to climb. We messed around with the injectors and eventually went back to a normal idle. After driving 15 miles, and chang… read more
Jeremy
Jeremy
Certified Truck/Bus Technician
Associate Degree
2,235 satisfied customers
1999 Peterbilt with Cummins n14 -- engine is loping, like a
1999 Peterbilt with Cummins n14 -- engine is loping, like a miss but has great pull and power, its just at an idle i can hear it lope.. no fault codes present,.. did accelerated cylinder test and all … read more
Daniel Wilson
Daniel Wilson
6,797 satisfied customers
I have 2003 Mack Ch613 with an E7-427. Engine won't start,
I have 2003 Mack Ch613 with an E7-427. Engine won't start, im not getting any power to the EUP. We have already swiched the EPU still no luck.… read more
Daniel Wilson
Daniel Wilson
6,797 satisfied customers
I have a leroi towable air compressor. I purchased it
I have a leroi towable air compressor. I purchased it previous owner ran it empty of diesel. the injectors are clogged no fuel. 2 injectors are delivering fuel what is the best way short of rebuilding… read more
Curtis B.
Curtis B.
Technician
Associate Degree
961 satisfied customers
Lets try this one more time, I have a Detroit 14L 2008 under
Lets try this one more time, I have a Detroit 14L 2008 under load in higher gears I will get a stumble for just a couple of seconds when getting into the fuel, it will come out and run good, I have no… read more
Daniel Wilson
Daniel Wilson
6,797 satisfied customers
CUMMINSDR only please i have an ISM esn-35020751 in a Volvo,
CUMMINSDR only please i have an ISM esn-35020751 in a Volvo, its having some kind of ticking/knock/ Slight miss, at about the start of 1750RPMs... i performed an Accelerated Cyl Cutout test and i got … read more
cumminsdr
cumminsdr
Mechanic
High School or GED
1,337 satisfied customers
2002 International 4300 DT466 Allison Auto trans. 2H512173
2002 International 4300 DT466 Allison Auto trans. 2H512173 last 8 of vin. Truck starts to miss around 1800rpm to 2000 once you reach speed over 65 it clears up even sitting still and accelerating it w… read more
Jeremy
Jeremy
Certified Truck/Bus Technician
Associate Degree
2,235 satisfied customers
I have a 1991 mack truck with a mack pedigree motor beleave
I have a 1991 mack truck with a mack pedigree motor beleave its a 400. part# ***** 3514 and s/n # ***** the vin reads 12mp270c3mmo10947. … read more
Jeremy
Jeremy
Certified Truck/Bus Technician
Associate Degree
2,235 satisfied customers
Working on a mack (mtg date 02/1999). engine is an e7 427.
working on a mack (mtg date 02/1999). engine is an e7 427. had a miss on #1 and #3 cylinder. Confirmed this by loosening the injector lines at the electric solenoids. I installed 2 reman injectors. #1… read more
Wayne
Wayne
Journeyman
Vocational, Technical or Trade Scho
2,869 satisfied customers
I am working on a mack ch613, it has an E7 engine. engine
I am working on a mack ch613, it has an E7 engine. engine has a miss. I cracked the injector lines at the electric solenoids and #1 and #3 make no difference. I was thinking of swapping two of the sol… read more
Wayne
Wayne
Journeyman
Vocational, Technical or Trade Scho
2,869 satisfied customers
Have a 2000 3126B engine SN #8yl52723 that we changed number
Have a 2000 3126B engine SN #8yl52723 that we changed number #6 injector today per diesel shop recommendation for hard start and lack of power. The truck did run okay and would start but we were tryin… read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
4,493 satisfied customers
2000 mack cl 713 etech 427 engine. engine misses after rolling
2000 mack cl 713 etech 427 engine. engine misses after rolling and/or idles for a while. does not happen in cold weather does it after 45-50 degrees outside. all uni pumps tested and are ok. transfer … read more
Daniel Wilson
Daniel Wilson
6,797 satisfied customers
Can you help me with the engines Mack produced and the
Can you help me with the engines Mack produced and the differences in them also how to distinguish the difference . Like the E7 to the MP series etc. The date range I would be looking for is from the … read more
Jeremy
Jeremy
Certified Truck/Bus Technician
Associate Degree
2,235 satisfied customers
N14 Cummins Celect Plus out of 02 T2000 KW can you show me
N14 Cummins Celect Plus out of 02 T2000 KW can you show me how test an injector to make sure is getting proper power output from ecm sometimes while driving injector will cut out specially if I let of… read more
cumminsdr
cumminsdr
Mechanic
High School or GED
1,337 satisfied customers
i have a 1995 mack dumptruck with the vin number 1M2P267C9VM029858
i have a 1995 mack dumptruck with the vin number 1M2P267C9VM029858 MODEL NUMBER RD588S the owner had fuel issues with it and yesterday it just stopped working the injection pump voltage is looking lik… read more
Daniel Wilson
Daniel Wilson
6,797 satisfied customers
I have 2007 Volvo 670 with a d12. My truck was recently in
I have 2007 Volvo 670 with a d12. My truck was recently in a shop for maintenance, and now I'm experiencing difficulty while accelerating and it keeps sputtering, the truck is also bucking and struggl… read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
4,493 satisfied customers
My N14 Celect Cummins smokes only at times. when it smokes
My N14 Celect Cummins smokes only at times. when it smokes idling its blue and that is only at times. Sometimes it idles, pure clear smoke. When I am heavy on the throttle it smokes black at the begin… read more
Daniel Wilson
Daniel Wilson
6,797 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