Question about 1990 Toyota 4Runner
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.
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
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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Posted on Jan 02, 2017
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