What is happening? The fuel trim goes real negative as I accelerate.
Negative fuel trims when accelerating
What is happening? The fuel trim goes real negative as I accelerate.
welcome to THE site
you'll get tons of help here.
Negative fuels trims are always better than Positive fuel trims. Be happy ur in the safe zone.
No Such Thing as a Fast Cobalt
welcome!
BULLSEYE POWER FANBOY #001
Welcome to the site.
I know what you have on your car, but the majority doesn't so start off with telling everyone you have an LNF with a K&N intake and it is untuned.
Any other mods?
My MAF relocated to the cold side CP drives stft's negative on accel, just the opposite of stock. Life is good.
Performance Autowerks
'02 WS6 on C2H5OH
negative fuel trims are indicative of a rich condition, as mentioned these are FAR better than positive fuel trims which indicate lean
Are you talking about your STF or is your LTFT skewed negative? STFT change all the time, and it could be something as simple as you got a good batch of gas compared to the last one...
I need to engage in homicidal activity on a massive scale......
Pedders Fanboi #001
My car with the mods listed below without a tune was hitting between +2 and +12 fuel trims throughout the RPMs according to HPTUNERS. Clearly a good reason for me to have gotten a tune haha
Silver SS/Turbo 2.4 Sedan
Cuda
You already have better info in a few hours on here then you'll ever get on the shortbus...
lol okay. Let me be more precise.
STFTs hit -25.0 at WOT or close to it.
LTFTS are creeping to -20.0.
Resetting the PCM by disconnecting the battery brings back to 0.0 so that I may watch them fall to -2930259u54968750698 again. Boost is low. 12psi roughly. and sometimes I cant even boost past 0. four T-bolt clamps hold my ZZP hotside charge pipe in place and they are tight like a tiger. No slippage there.
The K&N intake was giving me roughly -4.0 to 1.5 ltfts. Stfts were about the same but would shoot up to +15.0 for a split second when starting to throttle but they come back down immediately. Same effect happened with letting off gas but the stfts would be negative.
I now have the stock airbox back on and my fuel trims are even worse! Its not the intake thats the problem. I am thinking its a cracked IC? I can still drive the car. I plan to tomorrow to go to work anyways. lol.
Sounds like a boost leak.
Why do you have mods on your car if you're not tuned?
Tunes gonna happen eventually lol. Just want more mods. im a ricer.
Fix your boost leak first
Wow, There's alot of people in here that have veerrrrry similar names to some folks over at CSS.net. strange?
not strange
Negatives that high indicate a leak of some sort... most times intakes (unlike the hahn that cause positive trims) your LTFTs on most intakes untuned are in the 10-13's.
When they get that crazy you have a leak or a cracked intercooler which seems to be the culprit of most they just don't want to believe it.
Get it tuned, your car will be much happier.
STFTs will fix them selves and they will never stay zero as they are a constant changing trim.... you get your LTFTs at 0 your STFTs will correct themselves
new info:
Stock airbox is on and secure. Fuel trim is becoming more negative at a quicker rate now
intake was not the issue. There is a leak somewhere, I have to find it
Now I have a quiet car with a problem
not to strange lol
Ill bet it's the BPV Diaphram has a tear. Or some other boost leak like everyone is saying. Can you monitor KR (do you have the RPD?)? If so, with a boost leak the car likes to knock everywhere during a pull, trims go wacky and the boost should fluctuate up and down a bit!
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