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Fuel trims

zildjian102

zildjian102

New member
Okay well ive always seemed to have a problem with my fuel trims. I dont have any vacuum leaks so I'm thinking its something else. At idle my ltft's are anywhere from +14 to +16. But as soon as i start accelerating they jump down to +3 to +5 . Could it just be a bad tune? I have an intense pcm btw
 


if youre sure you dont have any vac leaks it might be the tune. however, there are other things that can create high fuel trims.
 
Many stock MAF tunes can have crazy wacked out fuel trims. I've started on cars that were +12's in the winter.
If you're sure that you don't have a vac leak (which would point to the +16 almost any time), then the tune is just that far off.
 
put it back in and see what happens. its not a restrictive part and its only job is to keep laminar flow across the MAF.
 


Also if you have a 2001 and new GP and no rear 02 that could cause the issue aswell. But Im still 99 percent thinking vac leak
 
well i know my evap system isnt working so idk if thats affecting anything.. I'll have to pick up a screen for the TB from the junkyard because i wasnt the one who took it out
 
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