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1994 Pontiac Grand Am lean exhaust

Tiny
ROCCOKIKO
  • MEMBER
  • 1994 PONTIAC GRAND AM
Engine Performance problem
1994 Pontiac Grand Am 6 cyl Front Wheel Drive Automatic

Hi there,
2 min after I start my engine it comes "check engine soon". I took the car for diagnostic and the guy from the shop told me that according his scanner my problem is "lean exhaust".
What could be that. I checked all vacuum lines and everything seems to be ok. While driving the car - no problem.
Please, help me!
Thanx
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Sunday, March 15th, 2009 AT 10:30 AM

3 Replies

Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
Hello, I'd want to see what the o2 sensor is doing? Open and close the throttle quickly, while watching the o2 sensor reading, there should be a reaction. If the sensor is showing lean, I try to drive it rich, to get a reaction.
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Sunday, March 15th, 2009 AT 10:49 AM
Tiny
ROCCOKIKO
  • MEMBER
  • 2 POSTS
I just replaced the O2 sensor with a new one and that solved the problem- no more "check engine soon" or other problems.
Thank you for your advice!
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Tuesday, March 17th, 2009 AT 10:33 AM
Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
Glad you got it fixed.
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Tuesday, March 17th, 2009 AT 10:42 AM

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