Question about 1992 Nissan 300ZX

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Have intermittant miss in 92 300ZX has had new platinum plugs recently so not plugs... car has has over 200ks on clock... miss is becoming more evident under load....

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The problem could be in a couple of things. All can be checked fairly easily. First, take all the spark plug wires off the spark plugs and get a spare plug (or old ones that works) and hook it to each wire individually. Hold the wire by the boot (rubber) and touch the plug to the engine block on bare metal and have a helper turn the car over (try to start it). Check how bright the spark is, if it is yellow or orange, it may be weak, if it is blue or white, it is strong. Remember what plug is the weakest (numbered in order from the front of the engine(nearest to the belts as 1) to the back (nearest to the transmission as 4))

You can use this information to tell your mechanic or if you are going to do the work yourself, you'll have a few things to check and replace.

First would be the spark plug wires if you haven't done so already.

Then I believe your car is distributor less so you'll have to locate the magnetos, they are at the other end of the spark plug wires and are usually in pairs on 2 separate blocks.

If at the other end of the wires you find one round looking "crown" with all the wires poking out of the top with one wire in the center going to another part of the engine, then you have a distributor. This could be the problem, if you have one. It could also be the magneto or coil at the end of the center wire.

It is not difficult to replace the distributor cap (crown) but label the wires around the cap and make sure to put them back in the EXACT order they were on originally. Same goes for the wires you took off the plugs.

If you have any more questions, or would like me to elaborate on anything, please leave a comment on this post and I'll try to answer as quickly as possible.

Good luck and don't forget to rate! Thank you.

Posted on Jan 12, 2009

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