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A platinum spark plug last longer than a copper spark plug however you're trading off engine performance for longevity of the spark plug. An iridium spark plug last longer than a copper plug and engine performance is at its best for the longest time. but its going to cost a few dollars more for these plugs. The champion or the a/c delco have been around for years and they will last for up to 20,000 miles. If you are mechanically inclined and you can change the plugs yourself the champions will be fine. Just change them when you need to, but if you have to go to a mechanic every time , then i recommend buying the expensive iridium from your local o Reilly auto store, or auto zone and then go and have them put on. It would be a little cheaper than purchasing them at the mechanic shop.

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Q: What is the difference between a platinum spark plug and a iridium spark plug?
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After replacing the spark plugs on 94' Acura Legend with Denso Iridium Spark Plugs 0.4mm my car does not start on the first crank. Has anyone else used these plugs Any advice is appreciated.?

I'm just now learning about spark plugs, but I read that the ignition system may not recognize the voltage used in the iridium plugs. They require less voltage than platinum to start the engine. The iridiums have a smaller tip, requiring less voltage. The ignition system just doesn't recognize the voltage probably.


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In the absence of any other problems (such as lean running condition, worn or non-iridium spark plugs, or damp weather) expect an EGR valve stuck open or a faulty MAP sensor.


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Get an inline spark checker. (Harbor Frieght for a couple bucks) Put this between the spark plug and wire and check the spark. If it is a bright sprk light then it is oky. Try this with all the plugs. If you are getting spark in the tester then your coil is good. If you run across a plug that doesnt fire then change it then recheck it. Brad.

Related questions

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NGK Iridium spark plugs are fine for your 1996 Honda Accord.


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