Will Bad Gas make my LTFT's go Positive?
05-28-2005, 09:53 AM
#1
Will Bad Gas make my LTFT's go Positive? Well I am in the works of a VE Tune had the LTFT's close to where I want them.But Then I had to get gas,Drove home all was fine.Then I had to go out and pick up a pizza,My Car didnt want to Idle,Surging and I noticed my Trims went from being -1 to-3 across my map board to Positive 4's5'sand 7's I was like WTF!I put dry gas in it when I got home.Drove it to work and Idle isnt as bad.But my Trims still arent right.Will bad gas mmake LTFT's go from Neg To Positive?Thanks!
Scott
Scott
05-28-2005, 12:33 PM
#3
Originally Posted by slow
changes in fuel will have an effect on the trims.
I started tuning a 42x ls1 motor with 6 month old gas in the tank, when we filled up during the tuning process, the trims were 10-20% off.
Ryan
I started tuning a 42x ls1 motor with 6 month old gas in the tank, when we filled up during the tuning process, the trims were 10-20% off.
Ryan
05-28-2005, 10:51 PM
#5
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Originally Posted by 405HP_Z06
Your FT's will skew for a short time immediately after filling your tank. I surmise it's because of the fuel vapor system.
He is correct...you might want to do a search on the HPtuners site. We had a pretty lengthy discussion about Trims being swayed after a fill up.
