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Runs well for ten minutes then has a significant loss of power

Tiny
RYDALC912
  • MEMBER
  • 1991 PONTIAC FIREBIRD
  • 5.7L
  • V8
  • 2WD
  • AUTOMATIC
  • 70,000 MILES
My car will run just fine for a little bit after start up but after I drive it for a little bit the check engine light comes on and the engine sounds and smells like its running too rich.
Friday, March 20th, 2020 AT 12:58 PM

2 Replies

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Good afternoon,

Do you know the code? It sounds like when it goes into closed loop, it is running rich.

A common issue is the MAP sensor but before you go there, I need the code and you need to check the hose from the sensor to the throttle body and be sure there are no holes in the hose.

Roy
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Friday, March 20th, 2020 AT 1:12 PM
Tiny
TOUGHDIVER
  • MECHANIC
  • 224 POSTS
Hi,

It could be the engine coolant temperature sensor is giving false reading the readings can be checked with a scan tool. I'm attaching sensor location and repair guides below. Let us know it you need more information.

https://www.2carpros.com/articles/symptoms-of-a-bad-coolant-temperature-sensor

Thanks
Joe T.
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Friday, March 20th, 2020 AT 1:23 PM

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