PCM Diagnostics & Tuning - Need a tune
05-05-2012, 09:07 PM
Ok i was using a scan tool and recorded some live data idk what im looking at do you see anything wrong note i swap a ls1 into a 94 impala. 2001 ls1 and trans 0411 pcm
05-05-2012, 09:52 PM
any kind of input
05-05-2012, 10:25 PM
Fuel trim is way high. What all is done to it?
05-05-2012, 11:51 PM
nothing i got the vats and emission deleted thats all
05-06-2012, 12:51 AM
You need your MAF tuned. Your intake ducting has changed from the donor car, and/or you have a larger MAF housing. Either one can cause issues. Your long term fuel trims are telling you that you need 20+% fuel added at idle to be at the ideal air to fuel ratio. You need that fuel to make torque, so you've left a lot of driveability power on the table right now, unless you've got an exhaust leak pre-O2's or a vacuum leak.
05-06-2012, 12:58 AM
Feel free to give us a call if you need a tune.
05-06-2012, 01:01 PM
Looks like the data was recorded while you were sitting idling - running those LTFTs at idle is often an indicator of exhaust leaks - are you sure you don't have any? Would have to see a log of a drive to find out - not just sitting idling...
05-06-2012, 01:58 PM
no exhaust leaks
05-06-2012, 02:04 PM
started the car while at idle I can see alot of fuel or condensation coming out the exhast while at idle... I put the maf 2ft from the TB i know on F body they was infront of the TB that could be my problem..
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