Question about 1990 Toyota Celica

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1990 Celica GT #4 cylinder is misfiring intermittently

Have changed all spark plugs and wires,distrib.cap,rotor, with no correction. Also, found oil getting into distr.cap. Having distributor replaced but mechanic not convinced this will solve problem. Any suggestions would be greatly appreciated.I have the same problem with my 1990 Celica GT with 2200 cc motor. Has new plugs, wires, rotor and cap. Mechanic pulled distributer and replaced O ring but there was no oil inside and everything looked good Can't really tell which cylinder/s are misfiring. Valve cover and tube seals were replaced as there was some oil leakage. OK now. No misfire codes on the computer? though mechanic says back then it wasn't very sophisticated. He says drive it until it gets really bad or dies then maybe he can figure it out.

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First, have you checked that all plugs are firing and that the firing order is correct? Those are easy things to miss. Otherwise, it sounds like the engine is out of timing, so check the timing belt and marks make sure the belt has not jumped time at all. Also, I believe your problem is the second half of the paragraph, so this is what I am basing my response on. Is the car backfiring at all? If it is then it would point further to the timing belt.



Benjamin

Posted on Apr 24, 2009

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Cylinder misfire p0300


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Your misfire can be cause by couple of things but the cheapest way that you can try to fix your car is to do a tune up by replacing:
1)all spark plugs
2)do a oil change
3)spark plug wires
3)distributor cap and rotor

note misfire can be cause by:
1.bad gas
2.spark plug and/or wire
3.distributor cap and/or rotor
4.valve adjustment
5.injector
6.off timing
7.ECM
8.bad wiring(power, ground or feed line)

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Probably you have a cracked or otherwise bad Distributor Cap. I would have changed the dist. cap and rotor first, and probably the wires too. You said you changed the boots, did that include the wires?

Pay attention to the order of wires before removing from cap. Draw yourself a diagram.
Are you sure you returned the plug wires to correct plug?

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1 Answer

1990 Celica GT #4 cylinder is misfiring intermittently


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