misfires without codes?

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Aug 27, 2009 | 10:09 PM

#11

viciousknid

Where's the Beef?

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From: Dover, Oklahoma

If your using your 02's they can go bad without throwing a code and you'll get horrible mileage but you'll notice really bad AFR's on your wideband (Assuming you have one).

When one of mine messed up It would sputter trying to give it some throttle but if i went WOT it would clear up.

Aug 28, 2009 | 05:25 AM

#12

GMCtrk

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From: Dallas

Quote:

Originally Posted by hirdlej

Is your AC bump spark on? I disabled mine as I was having a similar issue. Too much timing will cause your truck to "kick back" a bit. Try turning it off and report back

Could you please tell me how to disable this in EFI live? As far as I knew, only HP tuners could do it?

Also, why does GM have it in the first place? Does it protect the AC compressor somehow?