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How to read spark plugs and how they work.

Old 03-11-2007, 10:57 AM
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Default Re: How to read spark plugs and how they work.

I read through these last night, it has some good info, but it never mentions anything about when to pull the plugs...which is kinda the shitty part. 3rd gear pull (just like on a dyno) is what I usually do, take it to the top of the rpm and then immediately shut the car off and pull over. Pull your plugs then to read them, that way you won't have any off-boost carbon build up that may change the appearance of the plug. Now you see why it's easiest to do this on a dyno and not on the street :P
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Old 03-11-2007, 11:58 AM
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Default Re: How to read spark plugs and how they work.

Originally Posted by slo_crx1
I read through these last night, it has some good info, but it never mentions anything about when to pull the plugs...which is kinda the shitty part. 3rd gear pull (just like on a dyno) is what I usually do, take it to the top of the rpm and then immediately shut the car off and pull over. Pull your plugs then to read them, that way you won't have any off-boost carbon build up that may change the appearance of the plug. Now you see why it's easiest to do this on a dyno and not on the street :P
What all are you looking for when doing this?
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Old 03-12-2007, 12:34 AM
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Default Re: How to read spark plugs and how they work.

Originally Posted by Dmc1
Your looking for the condition of the plug to check for signs of detonation running rich or lean things like that. In the first link from my OP it has pics off plugs in differant conditions.
There is also a crude version of this in the back of haynes manuals. That is more of a stock trouble-shooting one though.
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Old 03-14-2007, 03:25 AM
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Default Re: How to read spark plugs and how they work.

good info
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Old 03-14-2007, 11:28 PM
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Default Re: How to read spark plugs and how they work.

I thought that you're asking about how to read the plugs, and I was about to post that very same link (#1) that you posted
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Old 03-18-2007, 05:12 PM
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Default Re: How to read spark plugs and how they work.

do you guys read the plugs to tune the ignition as well? and is it safe to do that way since it could be hard to detect detonation?
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