ksort86

So I have a 92 Sc300 with 174k, it drives fine and perfect. It just has a starting issue. When its cold or parked overnight it would FIRE right up just fine! but after driving it and trying to start it when the engine is warmed up, it would feel sluggish and die on its own in matter of seconds on after engine is fired up. I would have to try it 10 times before it would fire just right and running fine. Is it spark plugs or wires? But if this was the case wouldn't it still run but bog and feel sluggish but in my situation it dies, until I can actually fire it correctly. Could it be a FUEL sending unit or some sort? Your help is greatly appreciated.

Thanks!

ksort86

anyone? any help?

ICONYQ

iTrader: (3)

have you pulled the plugs to see what they look like or saturated with fuel?

DasBach

iTrader: (7)

Same issue happens to many people. Your fuel pump ECU might be dead.

Under the hood, there is a diagnostics port. Next time the car dies, use a piece of wire to jump Fp to +b. This will make the fuel pump work without using the FP ECU. If it never does it again, you have your answer. You can safely leave this mod in and the car will be fine.

My old SC300 did this, and this fixed it. Check for 12volt fuel pump mod if you want.

ksort86

wow I will do that thanks! Anyone can confirm this jump the Fp to +b? It will not ruin anything or harm if I jump it would it?

DasBach

iTrader: (7)

No.

10chars

miraluna

iTrader: (2)

Should this 12V mod. then fix this problem?

I have 12V mod. done and have the same problem... then what?

DasBach

iTrader: (7)

Read your other post on the other "same" topic.

Locate and change the faulty O2 sensor. I had a short, and it caused the car to die, and even sometimes blow an EFI fuse.

miraluna

iTrader: (2)

I just changed O2 sensor right b4 I did 12V mod...

miraluna

iTrader: (2)

I also changed EFI fuse...

miraluna

iTrader: (2)

I got it fixed... undo 12V mod...