Check Engine Light (lean mixture)
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Joined: Feb 2005
Posts: 52
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From: Memphis TN
Check Engine Light (lean mixture)
Hi All-
A friend has a 97 corvette with a check engine light that comes and goes. The code was checked and came up with lean mixture (cannot remember what the code number was). He is running premium gas, and the oxygen sensors were ok. The next test is to check if there is a vacuum leak somewhere. What is the best way to do this? Are there any other problem to look out for?
Thanks.
A friend has a 97 corvette with a check engine light that comes and goes. The code was checked and came up with lean mixture (cannot remember what the code number was). He is running premium gas, and the oxygen sensors were ok. The next test is to check if there is a vacuum leak somewhere. What is the best way to do this? Are there any other problem to look out for?
Thanks.
Burning Brakes
Joined: Dec 2004
Posts: 1,092
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From: Port Charlotte FL
Originally Posted by navy99vert
Check and make sure the air bridge is on good 
Team Owner
Joined: May 2001
Posts: 36,836
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From: Dear Karma, I have a list of people you missed.
St. Jude Donor '08-'09-'10-'11-'12-'13-'14-'15-'16
Also check fuel pressure. If too low could be a sign of pump problems or pressure regulator problems too. HTH
Racer
Joined: Jun 2002
Posts: 302
Likes: 1
From: Iowa
I recently had the same problem on my 97 Chevy pickup. A good friend who is also a GM tech correctly diagnosed the culprit to be a restricted fuel filter. The engine leans out momentarily and throws this code. Changed fuel filter, erased fault code and no more problem. 
No guarantee but this is a cheap place to start....Good Luck
No guarantee but this is a cheap place to start....Good Luck
