Question about 1991 Toyota 4Runner

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91 Toyota 4runner runs rough once warmed up at a idle but does fine going down the road. idles at 500 rpm when warm

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Ive had a problem like this before it turned out being a shim under the camshaft worn and when idle it wasn't pushing the valve down properly.all it took was shimming it out.might want to check that out pending your mileage.

Posted on Jul 13, 2010

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1 Answer

1992 F-350 w/460. Why does it run roughly after warmed up?


Does it run rough at hot idle ? How many miles ? Any recent work done on engine ?

Nov 05, 2015 | Ford Cars & Trucks

1 Answer

1990 4runner


A couple of possible problems, low compression on one or more cylinders, possibly a burned valve, possible headgasket leaks, have the compression tested and checked for a headgasket leak, both of these conditions would cause a rough idle and then seem to run normally when warmed up.

Jun 20, 2014 | 1990 Toyota 4Runner

1 Answer

Idle is high at start - 1800 rpm. Seems like excessive white smoke from exhaust. Put into reverse and back out of driveway it has a regular shudder (bump bump bump) but not hard metal grinding sound.....


white smoke out of the exhaust would be a sign that it is burning coolant... if it goes away after it warms up, it could just be condensation inside the exhaust pipe. 1800 rpm is a very high idle, maybe have your IAC motor on the throttle body checked... check engine light? if so have the code read at your local auto zone.

Aug 09, 2011 | 1998 Toyota 4Runner

1 Answer

4runner idle high when cold after warm up it idle 1200 rpm shot down engine after fuw min. restarting the engine the idle to low?


it seems that the auto choke setting is maybe wrong or there is a problem with engine management, or a worn part which is sticking.

when cold, the engine should be higher as the choke will be on but a warm up idle of 1200 seem a bit high i would expect around 800 and then on restart if the engine is warm then the choke should be off but the idle being too low indicates one of the above.

Nov 17, 2009 | 1995 Toyota 4Runner

1 Answer

4 runner surges when idling and once warm doesn't start


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.

Feb 20, 2009 | 1991 Toyota 4Runner

2 Answers

Low idle, stalling frequently


Hi, Check all vacume hoses and fittings make sure there are no vacume leaks also make sure ignition timing is correct.

Dec 01, 2008 | 1987 Toyota 4Runner

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