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 vwnewton Your Own Question

vwnewton
vwnewton, VW Owner,ASE Master and L1 Advanced
Category: VW
Satisfied Customers: 660
Experience:  25 years of VW obsession turned into a job, last 15 years as a VW Tech.
13710235
Type Your VW Question Here...
vwnewton is online now
A new question is answered every 9 seconds

2005 VW Passat: cylinder..light keeps coming..of the ignition coils

Customer Question

I have a 2005 VW Passat 1.8l 4 cylinder and my chec engine light keeps coming on. It continues to show miss fires in various cyclinders and have changed all of the ignition coils. please adsive what the probem could be. Plus the car is running really hard
Submitted: 5 years ago.
Category: VW
Expert:  vwnewton replied 5 years ago.

Hello, Jason here to help. If the misfire doesnt seem to stay with a cylinder, and a P0300,301,302,303,304 is generated, then there are other causes. A coil when it fails will cause a single cylinder to misfire.

Mass Air Flow Sensors(MAF) do fail quite often and will cause multiple random misfires.

A clogging fuel filter will also cause the same codes.

The fuel filter is often overlooked, and is inexpensive. If you have over 50k miles, change the filter first.

If there was also a P0171(system lean) code then this is a very likely cause.

If the MAF readings are low, either a dirty or failing MAF is likely. The MAF can be cleaned with MAF cleaner, Also inexpensive.

Another possible cause is a vacuum leak between the airfilter/MAF housing and the throttle body, or under the intake manifold. Usually will have a sucking/whistle noise at idle in that area if that is the cause.

A parts store can scan the car for free usually, record any codes and let me know.

Jason

 

vwnewton, VW Owner,ASE Master and L1 Advanced
Category: VW
Satisfied Customers: 660
Experience: 25 years of VW obsession turned into a job, last 15 years as a VW Tech.
vwnewton and 2 other VW Specialists are ready to help you
Expert:  vwnewton replied 5 years ago.

Please let me know if more information is needed before leaving feedback.

I want you to be happy with my answer!

If the fuel filter isnt the cure, or if no vacuum leaks can be heard or seen, please reply.

Testing the MAF sensor after cleaning will require a scantool if no codes like P0171,P1136(lean fuel mixture codes) are present.

Jason

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
  • 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
 
 
 

Meet The Experts:

 
 
 
  • vwnewton

    VW Owner,ASE Master and L1 Advanced

    Satisfied Customers:

    307
    25 years of VW obsession turned into a job, last 15 years as a VW Tech.
< Last | Next >
  • http://ww2.justanswer.com/uploads/vwnewton/2008-12-27_221405_JA_avatar.jpg vwnewton's Avatar

    vwnewton

    VW Owner,ASE Master and L1 Advanced

    Satisfied Customers:

    307
    25 years of VW obsession turned into a job, last 15 years as a VW Tech.
  • http://ww2.justanswer.com/uploads/audidoc/2008-12-23_175252_headshot.jpg VWDoc's Avatar

    VWDoc

    Independent VW Shop owner

    Satisfied Customers:

    1713
    20 years of experience working with VW's. Independent European shop owner and technician.
  • http://ww2.justanswer.com/uploads/35/350matt/2012-6-7_182356_matsavatr.64x64.jpg Matt's Avatar

    Matt

    Engineer

    Satisfied Customers:

    506
    Mechanical Engineer with 20 years experience in the auto industry, 8 yrs in formula 1 engine testing
  • http://ww2.justanswer.com/uploads/CA/carbezerk/2011-3-13_103612_SAM0048.64x64.JPG Martin's Avatar

    Martin

    auto electrical

    Satisfied Customers:

    475
    South African Trade Diploma in Auto Electrical
  • http://ww2.justanswer.com/uploads/terocoga/2009-08-17_050126_015.JPG RobJackson's Avatar

    RobJackson

    VW Mechanic

    Satisfied Customers:

    416
    Started working in VW/Audi dealership in 1999. 2009 Registered and Certified VW Tech. ASE Master
  • 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:

    397
    Have owned a repair shop for 25 yrs.
  • http://ww2.justanswer.com/uploads/RO/rodcuda/2011-7-25_224114_Donhoff1.64x64.JPG Neal's Avatar

    Neal

    VW Mechanic

    Satisfied Customers:

    391
    Shop owner and experienced in most brands.