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 internal88 Your Own Question
internal88, Technician
Category: Porsche
Satisfied Customers: 2558
Experience:  Over 10 years in the Import Auto industry. Engineering background and diagnostic is my specialty.
Type Your Porsche Question Here...
internal88 is online now
A new question is answered every 9 seconds

I have a ,1998 91carrera conv it has ,100 thousand on it it

Customer Question

I have a ,1998 91carrera conv it has ,100 thousand on it it smokes once in a while when I start it and once in while it smokes so bad on the highway I can stop traffic I cleaned the throttle body and it went away for about ,50 miles its back doing it again and the only codes I get r a misfire any ideas
Submitted: 1 year ago.
Category: Porsche
Expert:  internal88 replied 1 year ago.

Hello, I'm Brandon- Porsche tech.

The valve guides are worn out therefore you will smokes during start up and driving on the highway.

It is a result of causing the coil and spark plugs to misfire.

This is an expensive job - you are looking at a ball park of $5000 for a good Porsche shop.

Let me know if you have further question. Please rate me positive for the prompt service, Thank you!