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Engine runs rough at cold startup and stalls most of the time MAF sensor is all over the place up and down.

Tiny
FIREMNTED
  • MEMBER
  • 1996 BUICK REGAL
  • 189,000 MILES
1900 miles on the Original rebuilt engine (my dad was an ASE Mechanic for 35 years but got out of the business in 1996

I have already replaced the TPS, Temp, MAP, MAF, upstream o2 sensor.

Plugs and wires are new I have cleaned the grounds on the bell-housing I do see a ground with a 16-18 Ga. Wire by the battery tray on the inner fender well that the bolt is so rusted I haven't had the time to remove and clean it! (Could this be the problem)
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Thursday, June 14th, 2012 AT 3:16 AM

3 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,755 POSTS
Check the IAC and check for vacuum leaks.
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Thursday, June 14th, 2012 AT 3:43 AM
Tiny
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I have suspected the IAC but it has about 6 pins and I cant find anything on how to test it! No vacuum leaks! I forgot to add if I hold the throttle at 2000 RPM's and slowly reduce the RPM's the MAF sensor is stable at Idle!
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Thursday, June 14th, 2012 AT 4:04 AM
Tiny
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I'm getting my readings from a scanner!
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Thursday, June 14th, 2012 AT 4:07 AM

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