Justinktm

iTrader: (2)

ive been racing since i got my new converter in and it just doesnt seem fast anymore it seems like it was faster with just bolt ons sadly i have no idea what the problem is !!

i have a tv2 cam, ls1 intake, 853 heads, 7.4 pushrods, ls7 lifters, FTI 4200 converter, 4.10 gears, built 4l60e and ive been racing some people and i yank out on the hard then all of a sudden it feels like a complete turd about 5000+rpms i havent a clue what the problem is
i was tuned for a 3600 converter and i think my mass air has been going bad this whole time i dynoed at 360rwhp and every other pass i made it would drop 10 horse
i went to auto zone and im throwing 7 codes
x2 - PO155 heater condition oxygen sensor bank 2 sensor 1
x2 - PO135 heater condition oxygen sensor bank 1 sensor 1
x2 - PO103 MAP sensor/MAF sensor/ VAF sensor
x1 - PO751 1-2 shift solenoid valve performance (incorrect shift pattern)

could someone please explain these to me in the dumb version !! also now whats new is the built trans and the 4600 converter thats the only thing i put on after tune

Justinktm

iTrader: (2)

ALSO i went over a bump today and when the car came up i heard a loud grinding noise then it came down and was fine but it feels like when i go WOT someone is pulling the car back and just slowing me down its a big difference and when i hit second gear into 3rd it sounds like alot of shaking down by the driveshaft not sure wtf that is either

Bo's 98 TA

iTrader: (4)

Fuel pump maybe? I had that same kind of problem just a week ago and I put a 255 pump in and fixed most of my prob but now I keep having a map sensor go bad.

Old Geezer

iTrader: (3)

Data logs may tell the tale...Without data collection, U R pounding sand in a rat hole...

Justinktm

iTrader: (2)

data logs like fuel and all that stuff my buddy has a computer that reads the air fuel ration and on the fuel chart my fuel is like up and down up and down

outkast6991

iTrader: (34)

Is everything plugged in correctly? The Maf code could have an effect on the teams I believe

Justinktm

iTrader: (2)

What teams ? And I checked oil and there's close to nothing in there but no leak? Also had a buddy put my crank pully back on and i checked one time bolt was loose but. Pulley was on!!!! Would I lose power from that ? Maybe not tight enough so it's just spinning in there