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 DaveTheCarGuy Your Own Question

DaveTheCarGuy
DaveTheCarGuy, Car Enthusiast
Category: Car
Satisfied Customers: 202
Experience:  AAS in Automotive Technology.
75818362
Type Your Car Question Here...
DaveTheCarGuy is online now
A new question is answered every 9 seconds

suzuki grand vatara: 1999 Suzuki grand vitara 228000 mi. ran

Customer Question

1999 Suzuki grand vitara 228000 mi. ran fine would sometimes shut off , start right back up, cleaned maf worked ok for a few day's then again threw code 102 took to shop they replaced maf sensor now backfires when cold gets better when warm?
Submitted: 1 year ago.
Category: Car
Expert:  DaveTheCarGuy replied 1 year ago.

DaveTheCarGuy :

Hello, Code P0102 is Maf low input. This code can mean more than just a MaF problem. It is the computer saying that the engine is getting more air than the maf is reading. This can be a clogged intake, a leak in the intake piping, or another airflow issue. Start by checking your intake piping for obstructions or damage. Focus on the area after the maf. If you don't find the issue

DaveTheCarGuy :

If you don't find the issue in the intake pipe, check all your vacuum piping. If you don't find the issue let me know.

Customer:

what about the backfire and it ran fine before the maf sensor was replaced?

DaveTheCarGuy :

Backfires can be caused by any fueling issue; too much, or too little and you can have backfire situations. Are you sure that it is a backfire and not a misfire?

DaveTheCarGuy :

Also, they may have reset the PCM to clear your code after replacing the maf. This will also reset the fuel trim adjustments that your car had learned. This may have uncovered an issue that had been covered up by the cars adjustments.

DaveTheCarGuy, Car Enthusiast
Category: Car
Satisfied Customers: 202
Experience: AAS in Automotive Technology.
DaveTheCarGuy and 13 other Car Specialists are ready to help you
Customer: replied 1 year ago.

I already knew what po102 is, what about the backfire and running better when warm

Expert:  DaveTheCarGuy replied 1 year ago.
It sounds like you have a vacuum leak past the Maf. What this allows is more air then expected into the combustion chamber. As far as the running better warm and the backfiring; A car needs more fuel when cold then when warm, so if you have a fuel shortage (like one from a vacuum leak or past maf air leak)it will run worse when cold than when warm(when it needs less fuel). The backfiring can also be caused by this issue in two ways:
Way 1 - There is not enough fuel in the air to be ignited by the spark, but once it gets into the exhaust manifold it ignites, this causes a back fire out the exhaust.

Way 2- The cause is the same as way 1, but it happens during the very small amount of time that both valves are open and it backfires into the intake (the intake has less pressure so it will head there over the exhaust if it can)

Thanks,
Dave
Expert:  DaveTheCarGuy replied 1 year ago.
Hello,

Is the car running better? If you have any follow up questions or need more help with this one, please let me know.

Thanks,
David
Customer: replied 1 year ago.

car is running fine . I think it needed to re-learn some settings. Thanks for your suggestions.

Expert:  DaveTheCarGuy replied 1 year ago.
Hello,


I'm glad its running better. Ill be here if you have any questions.

Thanks,
Dave

P.S. Don't forget to leave feedback : )

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 would (and have) recommend your site to others I was quite satisfied with the quality of the information received, the professional with whom I interacted, and the quick response time. Thanks, and be sure that I'll be back whenever I need a question answered in a hurry. Stephanie P Elm City, NC
< Last | Next >
  • I would (and have) recommend your site to others I was quite satisfied with the quality of the information received, the professional with whom I interacted, and the quick response time. Thanks, and be sure that I'll be back whenever I need a question answered in a hurry. Stephanie P Elm City, NC
  • used your service this weekend with "Trecers" help. thank you ,thank you, thank you. replaced an A/C fan motor. Local Auto Zone had part. $15.00 "tracer" fee and $40.00 for parts, I saved several hundreds of dollers at a shop. i will recommend you and use you in the future. David L. Richmond, TX
  • 9 dollars, 2 hours of my time, and I drove away. Your diagnosis was right on the mark. Thank you so much. Phil Marysville, CA
  • Lurch. Thank you very much. I had real doubts about this website but your promptness of response, quick followup and to the point answer with picture was incredible. Charles Walnut Creek, CA
  • As a single woman, I really appreciate an excellent and affordable opinion.
    Thank you Geordie, I will not hesitate to contact justanswer in the future!
    Sue Charleston, WV
  • Another great insight to what may be the problem. I will have my mechanic take a look at it tomorrow. Thanks again, Frank...you do indeed know your stuff. Jim Castleberry, FL
  • Excellent reply, and also very quick. Really sounds like the Expert knows what he is talking about. I will be back to use your service when I need more help with my RV. Dutch USA
 
 
 

Meet The Experts:

 
 
 
  • Chris (aka-Moose)

    Technician

    Satisfied Customers:

    846
    16 years of experience
< Last | Next >
  • http://ww2.justanswer.com/uploads/MU/muddyford/2012-6-13_1204_1.64x64.png Chris (aka-Moose)'s Avatar

    Chris (aka-Moose)

    Technician

    Satisfied Customers:

    846
    16 years of experience
  • http://ww2.justanswer.com/uploads/TE/TedG/2012-6-15_14759_avaLarge.64x64.jpg Ted G.'s Avatar

    Ted G.

    ASE Certified Technician

    Satisfied Customers:

    1596
    20 years auto repair experience, ASE Master Tech, Mechanical Failure consultant, Expert Witness
  • http://ww2.justanswer.com/uploads/joecamel90/2008-11-13_03615_head_shot.jpg George H.'s Avatar

    George H.

    ASE Certified Technician

    Satisfied Customers:

    1311
    ASE Master Tech 15+ yrs, AAS Automotive Technology, Factory trained Asian specialist
  • http://ww2.justanswer.com/uploads/AM/amedee/2013-10-24_23656_Amedee1.64x64.jpg Amedee's Avatar

    Amedee

    ASE Master Tech

    Satisfied Customers:

    2367
    ASE Master Tech advanced level specialist
  • http://ww2.justanswer.com/uploads/SU/supermechanic/2013-8-23_03546_500.64x64.jpg Jerry's Avatar

    Jerry

    Master Mechanic

    Satisfied Customers:

    1906
    ASE master, 30+ years. All makes and models. Trouble shooter, shop forman, service manager
  • http://ww2.justanswer.com/uploads/CR/crzydrvr00/2013-11-3_12123_246347.64x64.jpg Richard's Avatar

    Richard

    ASE Certified Technician

    Satisfied Customers:

    942
    12 years Ford Lincoln/Mercury Jaguar dealership as a technician and shop foreman reparing all makes
  • http://ww2.justanswer.com/uploads/ST/Steve7654/2012-6-5_215929_japic800x660.64x64.jpg Steve's Avatar

    Steve

    Auto Service Technician

    Satisfied Customers:

    1980
    25+ yrs experience as a professional working technician; ASE L1 master technician
 
 
 

Related Car Questions