1994 Toyota pick-up 22re stumbles at idle and just above when engine gets warm. Runs fine cold.?

Question

The truck will start right up and run fine, but about 5 minutes later I can hardly pull away from a stop light, I have to rev it up and ride the clutch, once it reaches approx 1500 rpm it runs fine. I have changed plugs, wires, rotor button, cap, fuel filter, I ran a can of Sea Foam through it. I thought maybe it was the engine temp sensor, but everything I've read about them say the engine is hard to start when they fail. I don't want to start just shotgunning parts at it. I have been told it was anything from the idle air control, EGR Valve, Throttle position sensor, I don't know (obviously) any help would be greatly appreciated thanks, Rick

Answer 1

Maybe service bulletins and other owner experiences will help. Try reading out the OBD-I emissions error codes from the computer even though your check engine light hasn't been on.



http://www.edmunds.com/maintenance/MaintenanceServlet

http://www.mycarstats.com

Answer 2

22-R-E are great engines. (1985 Celica GT owner)

I'd have to say 02 sensor......Throwing off the air / fuel mixture.

ADDED:
The reason I say that, is that the computer is preset at a certain setting untill the engine reaches operating temperature.
At this point, the 02 sensor takes over the air/fuel mixture.

If it runs fine cold, and runs crappy hot...it's the 02 sensor.....

Answer 3

Try checking the trouble codes for the engine. It will at least tell you where to start looking.
Look here for a good bit of instructions:
http://www.off-road.com/toyota/tech/codes/index.html