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2000 Buick Regal Regal Dies while driving

Tiny
NBFONG
  • MEMBER
  • 2000 BUICK REGAL
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 104,000 MILES
Hi,
My buick regal has had an assortment of problems over the years:
1) car was hesitant to accelerate, very sluggish. Pulled code, code said O2 sensor or MAP sensor. Replaced O2 sensor, that didn't help. Replaced MAP sensor, that didn't help. UNPLUGGED MAP sensor, after 30 seconds car would run just fine. This was 2 years ago, so I've been driving without MAP sensor plugged in for 2 years.
2) recently, the car has died suddenly while driving down the road. I restart it, but it soon dies again. I restart it and immediately rev the engine to 4000+rpm, and then the car drives fine for a couple more days.
Since this problem first occured, I've replaced the fuel filter and spark plugs/wires. Cat. Converter doesn't rattle.
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Thursday, April 22nd, 2010 AT 2:27 PM

1 Reply

Tiny
MMPRINCE4000
  • MECHANIC
  • 8,549 POSTS
MAP (Manifold Absolute Pressure) uses fluctuations in vacuum to calculate volume of air coming into engine and sets fuel and ignition accordingly.

A disabled (unplugged) MAP would default to a very rich mixture to avoid a lean fuel mixture which could very quickly burn a piston.

I think your CAT is melted internally, causing a severe restriction.
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Sunday, April 25th, 2010 AT 8:26 AM

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