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#4595082 - 12/05/17 02:18 PM Spark Plug Wear
Merkava_4 Offline


Registered: 01/30/07
Posts: 17501
Loc: Clovis, CA
If you pull one of your spark plugs out and measure the electrode gap, is that a good indication of the gap for the rest of the spark plugs ?

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#4595088 - 12/05/17 02:23 PM Re: Spark Plug Wear [Re: Merkava_4]
Chris142 Offline


Registered: 06/05/03
Posts: 16835
Loc: Deplorable in apple valley, ca
yes
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#4595100 - 12/05/17 02:28 PM Re: Spark Plug Wear [Re: Merkava_4]
mk378 Offline


Registered: 09/27/15
Posts: 1421
Loc: USA
Certainly if you take one out and find it's worn out, time to replace them all.

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#4595164 - 12/05/17 03:17 PM Re: Spark Plug Wear [Re: Merkava_4]
JMJNet Offline


Registered: 09/06/07
Posts: 934
Loc: TX, USA
within a certain range, yes. Unless you can measure it to the super micro units likw 0.0000000000000000000000000000000000001 micrometers


Edited by JMJNet (12/05/17 03:18 PM)
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#4595172 - 12/05/17 03:29 PM Re: Spark Plug Wear [Re: JMJNet]
NateDN10 Offline


Registered: 01/10/10
Posts: 1735
Loc: Rochester, NY
Originally Posted By: JMJNet
within a certain range, yes. Unless you can measure it to the super micro units likw 0.0000000000000000000000000000000000001 micrometers

10^-43 meters is very small indeed. 100 million times smaller than the Planck length, which is believed to be the shortest meaningful length.

(Yes, I realize you were using hyperbole but I couldn't help myself from converting to scientific notation!)


Edited by NateDN10 (12/05/17 03:31 PM)
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#4595253 - 12/05/17 04:56 PM Re: Spark Plug Wear [Re: Merkava_4]
Trav Offline


Registered: 11/20/06
Posts: 18903
Loc: MA, Mittelfranken.de
With your luck you would pull the one the previous owner replaced 3 mo ago looking for a misfire.
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#4595317 - 12/05/17 06:13 PM Re: Spark Plug Wear [Re: Trav]
Kira Offline


Registered: 08/19/10
Posts: 5262
Loc: Champlain/Hudson Valley
Thanks above for doing the math. Counting all those zeros would've killed my eyesight.

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#4595490 - 12/05/17 09:30 PM Re: Spark Plug Wear [Re: Merkava_4]
i_hate_autofraud Offline


Registered: 05/19/16
Posts: 706
Loc: Canada

On late model engines:

On Iridium tipped plugs, I'd go by mileage. Reason is that there's a tiny
hard to see iridium pad on the ground electrode that's super thin, when it burns
away at about 100K miles, the gap will look OK and even gage OK, but as the iridium
disappears off the ground, you'll suddenly burn away the plug to a misfire and damage
the Cats. The fuel mixture is lean and hot so the soft steel in the ground electrode
won't take it.

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