04 termi running rough...smart guys come on in!

[taylorcrzy]

Car runs perfectly at idle and wideband shows 14.7, once you give it gas it goes super lean around 19 and falls on its face. I have checked fuel pressure and it's perfect at 39 psi on a scanner and 30 lbs by gauge off the fuel rail. The fuel pressure doesn't drop off once you crack the throttle. I sprayed brake cleaner around the supercharger and all vacuum lines and also smoked the intake looking for vacuum leaks. I replaced the spark plugs, coil packs and the entire fuel system to include both pumps, FPDM, and FRPS. The car has a kennel bell 2.4 on it since 2005. I have a datalog from HP Tuners if someone would be willing to take a look at it and give me a recommendation. I am completely stumped!

 

[olympic]

My car did that when I first bought it, turned out to be a garbage tune. Did this issue occur after you changed something or did it start happening out of the blue? Another thing I've seen cause it is a big voltage dip when applying throttle. This can happen if the alternator or battery is weak or you have alot of power hungry things that kick on when accelerating like a BAP, meth injection, etc. This is easy to spot in a datalog but I'l leave that to someone else as I'm far from an expert in that area.

 

[taylorcrzy]

Car just started running like crap outta the blue. Car has a new battery and doesn't seem to struggle when it starts. No BAP or meth injection.

 

[olympic]

Any chance of a dirty MAF sensor? Any codes? If there are no codes then getting someone to interpret the datalogs is the best bet. No use throwing more parts at it.

 

[taylorcrzy]

The MAF is an ABACO four sensor unit that had a broken diode on one of the sensors so I replaced it with a new unit.

 

[taylorcrzy]

I have a datalog if someone is savvy at interpreting it.

 

[MustangThief]

I was gonna say check for leaks but saw you did that... what power are you making? You said you don't have a bap? Do you have injectors? With my mods I had to do a MAFia and 63# injectors.

Have you tried reuploading your tune or changing to another tune? I have a performance tune with a few extra *'s timing and a daily driver tune, and a "bad gas" tune that pulls timing.

I'm not a tuner but I used to scour over my tune and read my datalogs quite a bit when I was really into running around with my laptop in the car. If you wanna upload the datalog i can see if i see anything glaring but if you had it on a dyno a tuner could probably see the issue within a few minutes