I recently completed putting a stock TBI setup into my carb'ed '87 350. I have all new sensors, but have junkyard harness, computer, distributor, and throttle body. Everything seems to be correct, but the computer will not advance the timing on accelleration, and I get a LOT of hesitation under load. If I gradually accelerate while parked, it will run smooth as silk at 3500rpm. I went back to the standard HEI distributor setup but still experienced the major hesitation under acceleration and load, so I'm not sure it's related to the timing. Since the HEI didn't work much better, I went back to the computer controlled distributor.

I've tried another computer(1227747) including another EPEOM and the symptoms are exactly the same. I've also tried other, used sensors with the same symptoms. The voltage on the MAP responds properly to vacuum.

As you can imagine, this is really puzzling when a TBI is such a simple system that should be almost 'plug and play."


ANY ideas or direction would be GREATLY appreciated!!

bill.morrison@cox.net
Louisiana