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1999 Volkswagen Jetta Stalling on Acceleration

Tiny
TAZMAN1982
  • MEMBER
  • 1999 VOLKSWAGEN JETTA
  • 4 CYL
  • FWD
  • MANUAL
  • 140,000 MILES
My 1999 VW Jetta, Stalls out in acceleration, mainly from 1-2K RPM. And will fall flat. And it is getting worse as it goes. When up to temp, It is not "as" bad.
Things I have fixed already: Plugs, Wires, Fuel Filter, Air Filter. I have done the Basic trouble shooting.
The code reader says Vacuum Leak but the Vacuum tester showed it was fine.
After doing some research it points to 3 things.
O2 sensor, Fuel Pressure regulator, or MAF sensor (replaced 1 year ago) They all range in the 50-100+$ range. I don't have the $$ to throw parts at it.
Do you know of any thing that would be the main problem? If I had to buy 1 part. What one would you do?
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Saturday, October 9th, 2010 AT 5:21 PM

9 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,755 POSTS
This is a tough one. The maf is my first guess, and I mean guess. The regulator could do the same as well as a vacuum leak. Have you tried cleaning the MAF?
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Sunday, October 10th, 2010 AT 12:05 AM
Tiny
TAZMAN1982
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  • 5 POSTS
I pulled the MAF off and blew it out. Not sure how else to clean it. It was spotless to begin with but I did try to clean it.
Is there a special way to clean it?
And according to the vacuum reader there is no leak. My dad and I are at such a loss with out blowing $$ and still having to take it to a repair shop.
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Sunday, October 10th, 2010 AT 7:14 PM
Tiny
JACOBANDNICKOLAS
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They make a special electronic cleaner that you can get at a parts store to properly clean the MAF. Have you noticed any difference since you blew it out?
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Monday, October 11th, 2010 AT 8:56 AM
Tiny
TAZMAN1982
  • MEMBER
  • 5 POSTS
It was still laggy after. It seemed a bit better after until I shut the car off and it cooled down a little. Then it was just as bad. So I don't know if I can attribute the better running to the car warming up or blowing it out.
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Monday, October 11th, 2010 AT 10:24 AM
Tiny
JACOBANDNICKOLAS
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I would try cleaning it with the cleaner. I recommend this so we can save money if that is the problem and not have to replace it.
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Monday, October 11th, 2010 AT 11:20 AM
Tiny
TAZMAN1982
  • MEMBER
  • 5 POSTS
I used the MAF cleaner and the check engine light shut off but it is still bad. Could the throttle body be bad?
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Monday, October 11th, 2010 AT 1:34 PM
Tiny
JACOBANDNICKOLAS
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If the light now is off, have the maf checked. I think it is bad. If it didn't pertain to the sensor, cleaning it wouldn't have changed.
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Monday, October 11th, 2010 AT 1:44 PM
Tiny
TAZMAN1982
  • MEMBER
  • 5 POSTS
It was the MAF. I talked with a VW dealer and he was very helpful. Gave me some trouble shooting ideas to verify the maf was problem. And it was. Problem now fixed.
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Monday, October 11th, 2010 AT 10:15 PM
Tiny
JACOBANDNICKOLAS
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That is what it sounded like. I'm glad it's fixed. Let us know if you have questions in the future.

Joe
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Tuesday, October 12th, 2010 AT 7:37 AM

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