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1993 Buick Skylark Custom 2

Tiny
RONALDDENNISONSR
  • MEMBER
  • 1993 BUICK SKYLARK
  • 78,000 MILES
1993 Buick Skylark Custom 2.3 4cy runs extreamly rich and rpm surges at midrang? Have changed ECM, fuel reulator, idle circut sensor, map, temp sensor x2 just to name a few?
Thursday, October 25th, 2012 AT 7:21 PM

3 Replies

Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Scan for codes and check fuel pressure first. See if fuel pressure holds after turning key off.
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Thursday, October 25th, 2012 AT 7:25 PM
Tiny
RONALDDENNISONSR
  • MEMBER
  • 2 POSTS
Code 26, 29. Holds fuel pressure, replaced fuel pump about 6-7 months ago. This started about 3-4 weeks ago. Seems to be geeting worse.
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Thursday, October 25th, 2012 AT 7:43 PM
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Ther eis no code 29 but a 28 and both codes lead ot a poor connection at pcm or pcm itself. It's inside the pcm called a quad driver. If you get another one then make sure to change theprom in the old one to the new one. And dont' touch it with your hand unless it is grounded to something.
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Friday, October 26th, 2012 AT 11:59 PM

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