Question about 1991 Toyota 4Runner
91 toyota 4runner . When idling it surges and once the vehicle has warmed up it won't start, engine turns over, let it sit for 1 hour and it will fire.
Something is riching or leaning this vehicle out at the wrong time. I'm gonna go with ERG valve being stuck in the open position. The only time this thing should work is at crusing speeds. Once the car has cooled down the fast idel cam takes over and prevent it from stalling. Once temp is within range idle cam stops and EGR is dumping into the mixture.
Use shop manual to do proper testing for the valve( probably a hand held vacuum pump is all you will need and gum out to free it up but you should properly replace it if it turns out to be the culprit.
Posted on Mar 20, 2010
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