lilninja

my 93 es300 runs fine until its warm then i have little to no power im not sure if the maf would be cause or something else maybe you guys have had similar issues???

GS4_Fiend

iTrader: (22)

it only happens during closed loop? i would check if the oxygen sensor is working correctly. Next would be the MAF and the ECT.

EEngineer

there is no MAF..
AFM

and most likely it's the O2 sensors.

GS4_Fiend

iTrader: (22)

Its actually Called a Vane Air Flow Meter.

lilninja

sorry wrong year mfg date is 7/1994

lilninja

which of the 4 would you suspect rather then replacing all? i have put in the downstream after cat. no change(the wires were there when i got the car but no sensor) and is there a way to test them with dvom?

GS4_Fiend

iTrader: (22)

You got 2 oxygen sensor upstream, which is before the cat. I would get those checked. And no, you cant get an accurate reading with a dvom. You would need a lapscope as the sampling rate is much faster.

GS4_Fiend

iTrader: (22)

94, in that case ur car does have a MAF. Clean it if you havent yet

lilninja

blew it clean with air compressor to see if that would help but nothing changed

GS4_Fiend

iTrader: (22)

your not suppose to blow it with compressed air lol. use CRC MAF sensor cleaner. Make sure you are cleaning the 2 hot wires inside not the the long needle, that's actually the IAT. do a search there are many threads on how to clean it.