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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 ?

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

Registered: 06/05/03
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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: 1256
Loc: USA
Certainly if you take one out and find it's worn out, time to replace them all.

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

Registered: 09/06/07
Posts: 880
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)
  • 2017 Toyota Sienna
  • 1995 GMC Suburban 6.5L Turbo Diesel

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

Registered: 01/10/10
Posts: 1722
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)
2016 Mazda3 - 11,000 mi.
2011 Toyota Sienna - 86,000 mi.

#4595253 - 12/05/17 04:56 PM Re: Spark Plug Wear [Re: Merkava_4]
Trav Offline

Registered: 11/20/06
Posts: 17772
Loc: MA,
With your luck you would pull the one the previous owner replaced 3 mo ago looking for a misfire.
ASE L1, Master. Deutsch Meisterbrief.

#4595317 - 12/05/17 06:13 PM Re: Spark Plug Wear [Re: Trav]
Kira Offline

Registered: 08/19/10
Posts: 4753
Loc: Champlain/Hudson Valley
Thanks above for doing the math. Counting all those zeros would've killed my eyesight.

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

Registered: 05/19/16
Posts: 675
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.