93 Sunbird too much fuel

EDDIE

MEMBER
1993 PONTIAC SUNBIRD
6 CYL
FWD
AUTOMATIC
200,000 MILES

93 Sunbird 6cyl getting too much fuel. Extereme backfire at startup cannot give any fuel to start and burns really rich. Has new fuel pressure regulator, fuel injectors and think new MAP sensor and have checked all the vacum lines. Started backfirring only on cold start (overnight) but does on any start now. Any ideas? Thanks

4 Replies

WRENCHTECH

MECHANIC
20,757 POSTS

What codes is it setting in the computer?

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Wednesday, February 2nd, 2011 AT 1:58 AM

EDDIE

MEMBER
3 POSTS

I am not getting a check engine light

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Wednesday, February 2nd, 2011 AT 11:19 PM

EDDIE

MEMBER
3 POSTS

I am really begging to think cat converter is stopped up. Any way to check other than cutting tail pipe in front of?

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Wednesday, February 2nd, 2011 AT 11:21 PM

WRENCHTECH

MECHANIC
20,757 POSTS

There would have to be codes stored if it was really running rich unless the problem is in the ECM itself. Someone is going to have to analyze the sensor data from using a scan tool.

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Wednesday, February 2nd, 2011 AT 11:26 PM