1993 BUICK SKYLARK
78,000 MILES
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RONALDDENNISONSR
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  • 2 POSTS
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?
Oct 25, 2012 at 7:21 PM
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HMAC300
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  • 48,601 POSTS
scan for codes and check fuel pressure first. see if fuel pressure holds after turning key off.
Oct 25, 2012 at 7:25 PM
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RONALDDENNISONSR
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  • 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.
Oct 25, 2012 at 7:43 PM
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HMAC300
  • CERTIFIED EXPERT
  • 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.
Oct 26, 2012 at 11:59 PM