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Very lean but only sometimes...

C

codyswanson4

New member
Hello, everybody! I just started piecing together some light mods on my 1997 GTP, but every once in a while, the SES light will come on. The code is for a system lean condition, but it clears its self after a few days. I checked the fuel trims at WOT and they are right around 0, but when I'm cruising they go to 16. Is this supposed to happen, or should I get a smoke test done?
 
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Have you cleaned the MAF lately?

Negative trims like -16 means it's overally rich, a smoke test won't show you something there. a Postive fuel trim of +16 would mean it's trying to add fuel because it's lean.

I'd suspect a dirty MAF sensor or leaking fuel injector if the trims are always negative on a factory calibration.
 
usually there is a vacuum leak when the fuel trims to positive. a misfire will make the fuel trims go lean as well.
 
Check vacuum lines.

With it being a 97, I'm sure literally everything is dry rotted.

Replace all of those and do the intake gaskets as well. Could be those, too.
 


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