Trouble code 45

1991 PONTIAC FIREBIRD
142,000 MILES • 3.1L • 6 CYL • 2WD • AUTOMATIC
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SDANDERSON5150
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  • 6 POSTS
Replaced oxygen sensor, digital EGR new ECM. New injectors, new pigtail connectors on distributor and coil, new TPS. Drives fine if let sit in park a few minutes starts idling rough then flashes code 45. let it sit for a while drive around no problems come back let sit idling in park a couple minutes light comes back on.
Jan 15, 2018 at 6:55 PM
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PATENTED_REPAIR_PRO
  • ✓ASE Certified Mechanic
  • 1,853 POSTS
  • ASE Certified Mechanic
Check your fuel pressure at idle and make sure it is not above 47 psi, cause the norm is 41-47 psi and if you have too much fuel pressure at idle, this might be causing the rich fuel mixture. If the fuel pressure is too high, check for a kink in a metal fuel line causing back pressure.
Jan 17, 2018 at 7:06 AM
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