Question about 1990 Nissan 300ZX

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My 1993 non turbo nissan 300zx starts and runs fine but after about 20 mins when its is warm a cylinder megins misfiring. Pretty sure it is on the right bank as that is the side misfiring. Love to know what possible causes there are and recommendations on a fix. Car has done 160000kms and is not overheating what so ever.

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Check the ignition coils ,plug wires and spark plugs,but it sounds like coils,with the engine off and cool,pull the plug wires off each of the coils , one at a time and put back,being careful not to break ,but sometimes white powder carbon builds up and stops a good connection,it may just be a coil or plug wire,there are code readers that you may can borrow from you local auto parts store..I hope this helps.

Posted on May 03, 2010


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