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1986 4 runner appears to be running on 3 cylinders after removing plug wires one at a time with no change on 4. has spark. what should I check next injectors valve?
Wiki User
∙ 14y ago
By checking for spark this means you removed the spark plug and put it back in the wire. Then did a spark check. This eliminated the possibility that the plug was bad. If this is not so then do that first. I have had many times where the plug was the bad part.
This being done you can reinsert the plug and start the motor. With a long metal rod of some sort. do a hearing test of the injectors. They make a tester that looks like a doctors stethoscope, that can be bought at the local parts house. But I find the screw in antenna also serves as a good alternative or a long screw driver. Carefully place one end on a good injector and the other end just in front of your ear. ( NOT IN IT)!
You will be able to hear the clicking sound coming from the injector. Now check the one on the bad cylinder. If its clicking then the injector is at least firing. If not then I would check the wires and connector for this injector and possibly get the injector removed and serviced.
If the clicking is there I would perform a pressure check on the engine and make sure the cylinder is getting the same pressures as the others. If not then possibly a valve is bad or the rings are shot.
Wiki User
∙ 14y ago
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