MSBlade

iTrader: (1)

Done some searching and can't seem to find a good reason from my troubles.
I have a 93 Sc300 M/T stock setup.
When I turn on the AC or the headlight the can stalls out. I can hear the fuel pump shut off.
I have changed out the battery, upgraded the alternator, changed the stater, upgraded and changed out almost all of the engine bay grounds and even added a few. The problem started a few days after I install a new AC compressor but now has added the headlights. I have also changed the fuel filter and even tried the 12v fuel ecu bypass. Cleaned the IAC and check the TPS
Oh and it doesn't matter if I am at idle or driving.

Looking for any ideas - suggestions- wild guess at this point.

O. L. T.

iTrader: (17)

ecu.....................

GS4_Fiend

iTrader: (22)

Time to pull out the wiring diagram... Hope someone can upload for you.

dtLS400

iTrader: (1)

I have a copy of the 92 sc300 wiring diagrams, would
They be close
To the same for a 93? I'm getting out of the 92 Lexus service manual...

Nova

iTrader: (21)

do you have the capacity and tools to do some electrical testing and can u follow a wiring diagram? if not then i would take it to a shop to diagnose

MSBlade

iTrader: (1)

Just got the service manuals with the electrical and doing some searching. What a pain in the a$$. Might try a different ECU as well. If all else fails I can always wire up the fuel pump direct w/relay until I do my engine swap.
Thanks for the responses.