1997 Lean bank 1, lean bank 2

Baja SS
03-07-2006, 07:40 PM
I'm having a heck of a time getting my Jimmy to pass the new NY emissions test. Code shows lean bank 1 and 2. So far I've replaced both o2 sensors, Maf sensor. check engine light still lights under 100 miles of resetting codes.

Any suggestions as to where to look next ?


03-07-2006, 08:24 PM
Post the exact codes along with any service history you have, and we can try to troubleshoot it for you.

Baja SS
03-08-2006, 06:06 AM
Codes were P0171, P0174
I'm thinking there must be a vaccume leak somewhere but I sure cant find one.

03-08-2006, 09:07 AM
Well unmetered air is getting into the system from some place, no mods done? How does the engine run? Check for low fuel pressure?

Baja SS
03-08-2006, 10:45 AM
No mods were done by myself, And none show in the service records from the first owner.
The engine rus fine just a little shake at idle.
There was a time last winter when it would kinda bog down when taking off from stop, but that has stopped.

03-08-2006, 11:00 AM
You should have a full scan done to look at all the parameters and continue to look for vacuum leaks particularly around the intake.

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