PearlESC3

Hello all i have a 93 sc300 with 145k miles on it. Use it as a daily driver, it had been running perfectly fine, until recently it seems to be stumbling upon acceleration slightly and not sustaining an idle, but rather dying out with no throttle applied. So it is now sidelined in the garage. Also there was almost a popping noise when pressing the throttle like intake valves are closing at the wrong time possibly. Was going to pop the timing cover off today and check to see if it skipped a tooth or something?? Also noticed a little white smoke rising from near the exhaust manifold as well. Forgot to mention i pulled the codes (obd1) 25 and 26 air fuel ration to rich and too lean.

Yesterday I replaced the MAF sensor, the 02 sensors, and a coupler off the throttle body that had a large crack. The codes were reset and have not come back on (haven't driven it on the road since i swapped parts because most of the same symptoms still exist, but i let it run for a few minutes while revving it up every now and then.) It is still slightly struggling when throttle is applied. (same popping almost type noise) however now it does sustain a very low idle now without dying, (5-600 rpm) any thoughts or ideas?

Tabaka

iTrader: (8)

Open up your ECU and see if some capacitors are fried.

PearlESC3

Thanks for the tip. I will do that tonight. I happen to have an extra auto ecu handy jic.