RagnZ

iTrader: (2)

The car is a 2000 camaro, stock 243 heads, t-rex cam, comp double 650 springs, forged pistons, rods, stock crank with 15000 miles on rebuild with no engine problems till now. The car had been sitting for a year awaiting a trans and converter rebuild. I replaced trans, converter, fuel pump (racetronix no hot wire kit), and rear end. Ever since i put the car back together it stumbles and backfires through the exhaust at part throttle under load around 3000 rpm. It's fine at wot but has slow throttle repsonse at idle and is not throwing any codes or ses lights. I'm stumped! i've replaced plugs, wires, 02's, had the tune and fuel pressure checked, also pulled the intake to check for vacuum leaks or burnt wires. We lowered the power enrichment from 64% to 23% and that seemed to cut down almost all of the backfiring but the stumbling and hesitation at idle remains. It seems to get much worse after the car really heats up (20-30min highway cruise). I'm also having problems with the converter staying locked while i'm cruising down the highway. If i let out of the throttle and just coast down the road the converter will unlock and try to lock back up but with no luck unless i tap the brakes or just let the car keep on decelerating. If i just let it keep decelerating the rpms will drop from 2300 or so depending on speed to 1000 rpm and the car will studder and the converter will lock hard and continue on locked up untill i let off the gas for more than 5 seconds. Any suggestions at this point would be greatly appreciated.

RagnZ

iTrader: (2)

anybody?

zracer323

iTrader: (12)

Sounds like the PCM needs to be tuned for the new transmission and stall. Is it different than what you had before or just re-built?

RagnZ

iTrader: (2)

Yes its a different trans rpm lvl 6 and circle d triple disc. Had a fuddle and stock trans before. It ran fine engine wise with this setup before I had to pull the trans to have it fixed.

RagnZ

iTrader: (2)

The new trans that is

RagnZ

iTrader: (2)

Bought it used.