Question about 1990 Toyota 4Runner

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1992 toyota 4runner sr5 v6 for starters it missed pretty bad

Ok, bought this truck thinking it was an easy fix. Maybe just a tune up. I replaced the cap and rotor. Still misses. I tweaked with the timing. No help. I was replacing the spark plugs until 2 out of six were coming out pretty rough. I think they might be cross threaded. I checked on a back tap and cheapest i found was 55 dollars online. The ones that did come out looked pretty bad. My question is if I get this spark plug issue fixed and it still misses what else could it be? Wires looked Ok. As it is it has no power to go uphill but it doesnt ever cut out and die.

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  • ronaldreser Apr 13, 2009

    Is there any major issues that could be the problem? How do I test for a more serious issue?



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When removing plugs from now on use some anti sieze on the threads. Also when taking out a plug from an aluminum head and it started to get tight it is because of carbon build up on the threads. If it gets tight stop and run it back in to loosen the bind, then try and remove it again, repeat till the plug is out. This usually keeps the aluminum from siezing to the threads and having the problem you have. Most cars now use carbon core sparkplug wires to run the spark to the plugs. These can break and loose contact thru the core if they are old. Your vehicle probably uses a ECM to control engine functions, so you may have to play with them also to get the power back. Also check the clearances on the electronics inside the distributor, it it is running out due to wear them it also may cause you some operational problems also. Good Luck, RAC

Posted on Apr 13, 2009

  • Richard Camp
    Richard Camp Apr 13, 2009

    The vehicle is new enough that you could put an OBC tester on it and read any trouble codes. Run a compression test on the motor while all the plugs are out and see what the compression is on each cylinder of the engine. The average compression is around 110 -120 pound conpression . This is read at three rotations of the engine. You screw in the compression guage on the cylinder, then turn the key to start, you will hear the engine push pressure into the guage, when you hear the third push quickly release the key from the start position. Then read the guage and write down the pressure for that cylinder. All cylinders should be within 10% of each other. If the pressure is good and you correct the ignition problem then you should be up and running. There is no gurantee that there is not another problem with the engine. You could also pul off the cam cover and replace the gasket in order to inspect the cam shaft or shafts to see if any of the lobes have been rounded off from excessive wear. The only other thing would be the ECM going out and not running the engine properly. I don't recommend buying those used because you could be buying someones other headach when you install it on your vehicle. Good Luck, RAC


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I've had my 1990 4Runner since 1994 and it has also bogged out somewhat going up an incline.

Posted on Jun 03, 2009


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