Ltft @ 16?

[rperry435]

Long term fuel Trim is sitting at 16...

Someone mentioned its a vacuum leak.

I've got a P0455 large evap leak and the check gas cap indicator on the DIC.

-I already tried the carb cleaner trick didn't find anything under the hood.
-I used my tech2 to command the purge and vent solenoids and they appear to be in working order.

I'm going to try a new GM Gas Cap tomorrow. Because that's the obvious choice but what's weird is trying to fill up. it acts like it's got a full tank stopping the gas pump at the station. Wait a couple seconds and start filling again... if I squeeze the handle less it doesn't act up as quick... any thoughts?

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[00grandprixgtp]

what are ur mods? i think my ltft was at like -5 until i got my pcm now i am at like 15 with the zzp pcm

[rperry435]

No mods really yet. App605 plugs..gutted cat and no res. K&n

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[Bio248]

LTFT of a maxed out +16.4 means you have a vacuum leak. it's trying to compensate and dump fuel in to richen up the car.

i would fix your evap leak and then go from there.

[TEK310]

do a smoke test at your local dealer or shop

[rperry435]

Yeah smoke test was the next plan.. I tried carb cleaner everywhere no change in idle not even slightly.

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