93 Sunbird too much fuel

1993 PONTIAC SUNBIRD
200,000 MILES • 6 CYL • FWD • AUTOMATIC
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EDDIE
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  • 3 POSTS
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
Feb 1, 2011 at 4:47 PM
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WRENCHTECH
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  • 20,761 POSTS
What codes is it setting in the computer?
Feb 1, 2011 at 5:58 PM
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EDDIE
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  • 3 POSTS
I am not getting a check engine light
Feb 2, 2011 at 3:19 PM
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EDDIE
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  • 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?
Feb 2, 2011 at 3:21 PM
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WRENCHTECH
  • ✓Experienced Mechanic
  • 20,761 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.
Feb 2, 2011 at 3:26 PM
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