1990 Buick Riviera car dies

Tiny
FISH KELSI
  • MEMBER
  • 1990 BUICK RIVIERA
  • 3.8L
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 154,000 MILES
My car dies after driving it for about 20 minutes, even if I just let it sit and idle after about 20 minutes it will die, I replaced the fuel pump, and replaced the fuel pressure regulator, and the ignition control module, and I cleaned the mas airflow, and replaced some vaccine tubes.
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Tuesday, August 19th, 2014 AT 7:05 PM

7 Replies

Tiny
JACOBANDNICKOLAS
  • EXPERT
When it dies, can you restart it? If not, have you checked for spark and fuel to the engine at that point?
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Tuesday, August 19th, 2014 AT 7:15 PM
Tiny
FISH KELSI
  • MEMBER
Yes it will start back up but I have to wait for a while, it does have spark, and it is getting fuel
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Tuesday, August 19th, 2014 AT 10:41 PM
Tiny
JACOBANDNICKOLAS
  • EXPERT
You mean it when it dies and won't restart, it is still getting spark and fuel? Are you certain? Is the spark a blue snapping spark and fuel pressure within the manufacturer's specs?
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Wednesday, August 20th, 2014 AT 5:26 PM
Tiny
FISH KELSI
  • MEMBER
Your right after it dies there is no spark until it cools down but it is getting fuel.
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Friday, August 22nd, 2014 AT 6:22 PM
Tiny
JACOBANDNICKOLAS
  • EXPERT
Okay. First, I am going to tell you what I think the problem is based on past experience. What I believe is happening is that the crankshaft sensor is most likely cracked. What I have seen happen is when the engine is cold, the sensor works. As the engine heats up, the sensor expands and spark is lost.

The only way we can be 100% sure that this is the problem is to have a scanner that can read real time data. When there is no spark and it won't start, we need to know if there is a signal from the crank sensor. No signal = bad sensor.
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Friday, August 22nd, 2014 AT 7:20 PM
Tiny
FISH KELSI
  • MEMBER
I replaced the crankshaft sensr and now it backfires and cuts out and has loss of power so what would cause that.
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Wednesday, August 27th, 2014 AT 6:31 PM
Tiny
JACOBANDNICKOLAS
  • EXPERT
Many things could. Have you checked to make sure timing is correct? Have you checked fuel pump pressure to confirm it is within the manfacturer's specs even though it is new?
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Thursday, August 28th, 2014 AT 7:13 AM

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