1991 Toyota 4Runner Engine Mis-Fire?

  • Thread starter Thread starter Ridah777
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Ridah777

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I just bought a truck and I didnt notice at the time it was mis-firing when in idle/park. Anyway, I doubt its going to pass emissions due to this problem. There is some smoke coming out of the exhaust. I changed the oil to see if it had a mix of coolent in it, but no. IT was black. It doesnt seem to overheat either. I checked and it was pretty full of coolent, so it doesnt look like its leaking. Maybe a little. With all that it doesnt appear to be a Head Gasket.

I changed the spark plug wires also, but no change. I guess I could change the spark plugs too. What else can cause misfires like this??
I was told it could be a bad valve. I highly doubt it sense this is a newer motor/rebuilt. Not sure what one. Anyway it only has less than 20k on this motor. So I dont think its a bad valve. Any idea??? Please Help.
 
I don't know if that model has a timing belt or a chain, but it sounds like it might have jumped time.
 
Should change the spark plugs to eliminate those parts. Other than a timing issue or valve problem, a bad fuel injector could also cause a misfire.
 
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