How JustAnswer Works:

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

Ask frank Your Own Question

frank
frank, Chevrolet Technician
Category: Chevy
Satisfied Customers: 3420
Experience:  33 years experience,24 years of Chevroler/GM experience and training .ASE Recertified Master Tech,
1816887
Type Your Chevy Question Here...
frank is online now
A new question is answered every 9 seconds

2003 Duramax LB7 vehicle emits grey/white smoke..Dealer says..exhaust

Resolved Question:

2003 Duramax LB7 vehicle emits grey/white smoke from tailpipe after extended (5-10 minutes) idle. Dealer says fuel return rate is ok. Also, heavy ammonia/urea smell from exhaust and heavy soot in tailpipe.
Submitted: 5 years ago.
Category: Chevy
Expert:  frank replied 5 years ago.
If your feul return rate is good and the balancing rate is good(the policy on the injectors only covers the return rate)smoke at extended idle is normal and there is a bulletin out on that.Are you running off road or bio-diesel?
Customer: replied 5 years ago.

Minor amounts of offroad and NO biodiesel, but this truck has never in 112k miles smoked like this since i bought it new in 2003. Dealer replaced injectors about 40k miles ago. Truck will emit CLOUDS of smoke, not a wisp...sometimes from stop and go traffic. Truck uses zero oil and coolant level is normal.

Expert:  frank replied 5 years ago.
#1-off road is high sulphur and will damage the "convertor" now called a egr filter.#2-the dealer checked for codes and excessive fuel return rates-but did they check the injector balancing rates-being off caused by bad injectors will cause it to smoke and for any codes-if you have a programer on it,thats is running the pressure up and eating the injectors up.
Customer: replied 5 years ago.
I misunderstood fuel type question...only ultra low sulfer california fuel and I forgot to mention: at time dealer told me return rate and balance OK, they replaced MAF saying that was what caused excessive smoke...still smokes like a chimney. No programmer...bone stock
Expert:  frank replied 5 years ago.
No codes and good return rate would mean that the computer is not seeing a problem-I really question the balancing rate.Do you know any one that can put a scanner on it to see what the balancing rate and idle fuel rail pressure is.
Customer: replied 5 years ago.
can this scanner be rented at an autozone? or is it specilized to connect into the fuel line?
Expert:  frank replied 5 years ago.
I am used to higher end scanner-I dont know if auto zone rents them or if their quailty is good enough for the system you have.
Customer: replied 5 years ago.

I will return vehicle to dealer and request written report of items you suggest.

 

thanks

Expert:  frank replied 5 years ago.
ok-and yes-injectors are usually the cause of excessive smoke and that should beable to be seen on a scanner-the question is if the person working on your truck knows what he is looking for or at.Its seems that the knowledge part is lacking at the dealers lately.
frank, Chevrolet Technician
Category: Chevy
Satisfied Customers: 3420
Experience: 33 years experience,24 years of Chevroler/GM experience and training .ASE Recertified Master Tech,
frank and 5 other Chevy Specialists are ready to help you

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:

 
 
 
  • I was having a terrible problem with the wheel bearings on my 98 Chevy Cavalier and I suspect that using this website saved me plenty of time and money. Todd L Rochester NY
< Last | Next >
  • I was having a terrible problem with the wheel bearings on my 98 Chevy Cavalier and I suspect that using this website saved me plenty of time and money. Todd L Rochester NY
  • 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!!!! Alex Los 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. GP Hesperia, CA
  • I couldn't be more satisfied! This is the site I will always come to when I need a second opinion. Justin Kernersville, 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. Esther Woodstock, 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. Robin Elkton, Maryland
 
 
 

Meet The Experts:

 
 
 
  • Tim's Auto Repair

    mechanic

    Satisfied Customers:

    7641
    Have owned a repair shop for 25 yrs.
< Last | Next >
  • http://ww2.justanswer.com/uploads/TI/tim37857/2011-10-28_23053_S6301814.64x64.JPG Tim's Auto Repair's Avatar

    Tim's Auto Repair

    mechanic

    Satisfied Customers:

    7641
    Have owned a repair shop for 25 yrs.
  • http://ww2.justanswer.com/uploads/DT/dt69nova/2012-6-15_234154_pic1.64x64.jpg Dave Nova's Avatar

    Dave Nova

    Chevrolet Technician

    Satisfied Customers:

    6870
    ASE Master Certification. GM World Class Certification
  • http://ww2.justanswer.com/uploads/ggrote1/2009-06-27_031011_me.jpg Gary's Avatar

    Gary

    Chevy Technician

    Satisfied Customers:

    5404
    15 years GM master tech
  • http://ww2.justanswer.com/uploads/testedtuff/2009-09-26_170108_pictures.jpg John's Avatar

    John

    Master A.S.E Automotive technician

    Satisfied Customers:

    4071
    A.S.E MasterTechnician A1-A8 w/L1,38 years experience General Motors Master Technician
  • http://ww2.justanswer.com/uploads/RO/rodcuda/2011-7-25_224114_Donhoff1.64x64.JPG Neal's Avatar

    Neal

    Chevy Mechanic

    Satisfied Customers:

    2306
    Shop Owner and Mechanic on multiple makes.
  • http://ww2.justanswer.com/uploads/goodwrench9124/2008-11-09_220838_dscf0007.jpg goodwrench9124's Avatar

    goodwrench9124

    ASE Certified Technician

    Satisfied Customers:

    2041
    Ase Master Certified, GM Master Certified Tech. Awarded GM Top performer, Hybrid certified
  • http://ww2.justanswer.com/uploads/DR/drivefast1971/2012-1-12_172422_0009051tQKh.64x64.jpg Ron Z.'s Avatar

    Ron Z.

    - Chevy Tech -

    Satisfied Customers:

    1912
    18+yrs experience. State Inspector and Chevy Diagnostics
 
 
 
Chat Now With A Chevy Mechanic
frank
frank
2588 Satisfied Customers
33 years experience,24 years of Chevroler/GM experience and training .ASE Recertified Master Tech,