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1991 Buick Century w/n start

Tiny
TPERK004
  • MEMBER
  • 1991 BUICK CENTURY
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 65,000 MILES
First, Car run untill it reaches operating temp then dies like out of gas. When cold off car will start. Fuel pressure is good, tps is good, IAC is good. Ignition module test good, MAS is good. Followed troubleshooting in mitchells on demand to check crank sensor. Now car will not start. All test say bad crank sensor. Changed it. Still w/n start. I am changing the sensor again but it seem I am missing something.
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Monday, January 19th, 2009 AT 1:57 PM

4 Replies

Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
Do you have the 3.3 litre engine? Did you check for spark at the plugs and injector pulse with the engine cranking? Any trouble codes?
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Monday, January 19th, 2009 AT 2:19 PM
Tiny
TPERK004
  • MEMBER
  • 3 POSTS
Yes I have spark and injector pulse. Now it back fires though the intake. I'm thinking it might have jumped time.
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Monday, January 19th, 2009 AT 6:19 PM
Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
Did you get the chance to check for codes? The knock sensor might cause a timing issue?

If that is a dual crank sensor, I'd check the circuits, ref voltage--ground--and two signals.

Yes, it could have jumped time.
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Tuesday, January 20th, 2009 AT 8:39 AM
Tiny
TPERK004
  • MEMBER
  • 3 POSTS
There are no code. I was also thinking the injectors could be the problem
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Tuesday, January 20th, 2009 AT 8:55 AM

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