Running Lean?
Thread Starter
Pro
Joined: Oct 2003
Posts: 705
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From: Churchville MD
Running Lean?
I've had P0171 & P0174 codes come up 3 times in the last 500 miles, usually after hard runs. The only mods on the car is a Halltech Stinger intake that has been on for a year now. I also noticed a little surging during 2-4 k rpms when cold and not as noticable when warm. Any idea whats going on? Is it really running lean?
Melting Slicks
Joined: Aug 2002
Posts: 2,737
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From: California USA
Originally Posted by 02impactblue
I've had P0171 & P0174 codes come up 3 times in the last 500 miles, usually after hard runs. The only mods on the car is a Halltech Stinger intake that has been on for a year now. I also noticed a little surging during 2-4 k rpms when cold and not as noticable when warm. Any idea whats going on? Is it really running lean?
Last I remember, about a 2-3% scaling of the inj would fix things, though I would prefer see the maf rescaled for the box.
Instructor
Joined: Sep 2003
Posts: 129
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From: Nassau County NY
427CPE is correct. I, too, was running lean after i installed my Vararam intake (verified via pre and post install scans with HPTuners). I ended up having to rescale my MAF (after VE tuning) accordingly....One other thing to look into is to be sure your intake system has not developed any air leaks upstream of the MAF, as any unmetered air entering the intake will also make you run lean......
Thread Starter
Pro
Joined: Oct 2003
Posts: 705
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From: Churchville MD
I found one of the clamps at the tb very loose and I tightened it thinking that was the problem, however the next time I took the vette out it threw the codes again after jumping on it. Does it have to relearn after getting more air via the leak?
