Whats up pplz I have a problem my 92 sc400 starts and shuts back off sometimes at cold start but whn I rev the car up yo like 5000rpm the car will idle normal.. has anyone ran into this problem or know why its doin that ?

 

What codes?. Could be a bad ecu, maf sensor, iacv, or tps sensor or a combination of each.

 

My guess is that your fuel pump ECU may be going out. Give this a shot: https://www.clublexus.com/forums/per...tures-faq.html

 

hi Markysc4,
I had the same problem, although my problems were mostly related to warm starts it is just like Kira X said, your fuel pump ECU is probably bad. if you don't feel like buying a new ECU, there is a mod that solves your problem: https://www.clublexus.com/forums/per...tures-faq.html

This solved the problem for me.

Make sure however to use a relay instead of just soldering together the wires. In that way your fuel pump will shut off when you turn off the engine and you can still have ACC on.
/Mike