1989 Chevy Beretta runs rough

Tiny
COLEMANLANTERN
  • MEMBER
  • 1989 CHEVROLET BERETTA
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 138,000 MILES
The engine started running rough about 2 weeks ago. Seems to be flooding. Had O2 sensor error and replaced that but no change. Still have a 24 error (VSS). Cleaned the EGR valve and made no difference. Doesn't seem to have a vaccuum leak but haven't measured either. Can drive it but only if it kept at a higher rpm and find the "sweet" spot in the throttle.
Monday, August 30th, 2010 AT 8:25 PM

3 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 110,176 POSTS
When was the last tune up? Also, have you checked fuel pump pressure? Finally, this problem can be caused by a bad throttle position sensor or idle air control valve. Has the check engine light come on?
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Monday, August 30th, 2010 AT 9:01 PM
Tiny
COLEMANLANTERN
  • MEMBER
  • 2 POSTS
No I have not checked fuel pressure. Are you thinking it's to high? The check engine light will come on periodically but nothing consitent. The only error code is a 24. Last tunup. It has newer plugs and wires but could not tell you when. They were installed before I got the car about a year ago.

How do I check for throttle position sensor or idle air control valve?
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Monday, August 30th, 2010 AT 10:14 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 110,176 POSTS
Either one will set the check engine light. I would recommend checking for vacuum leaks and fuel pressure. If you need directions, let me know.
Joe
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Wednesday, September 1st, 2010 AT 7:22 AM

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