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      06-19-2017, 06:15 AM   #1
Fast400
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Denso 3501 Spark Plug

I've been Googling my ass off for two hours but can't find any good info on the Denso 3501 Spark Plugs. They are supposedly an Iridium direct replacement for our oem plugs, yet when I compare I noted that the oem are 14mm and the Denso's are 16mm.
Will a thin wall 16mm socket even fit? It's pretty tight even with the oem 12 point plugs...
Has anyone installed these?
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      06-20-2017, 02:53 AM   #2
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These haven't been used by anyone....?
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      06-21-2017, 12:07 PM   #3
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So I did some number deciphering. It appears the original Bosch Spark Plug ZMR5TPP330 comes in two varieties. There is a second Bosch ZR5TPP330. The difference in the two plugs appear to be cost and a "M" on the ceramic. The other difference I found is that the original plug is not iridium. It is a platinum plug. It seems that the later ZR5TPP330 also costs 1/2 of the original ($10 a plug)....just some FYI
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      06-24-2017, 10:19 AM   #4
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Sooo....I did my Spark Plug change today (about 1hr). A couple of tricky spots but nothing impossible (video following).
A tip I wanted to give anyone thinking about using the Denso Spark Plugs....DON'T!!
They require a 16mm socket which will not fit down the spark plug hole.
I had original ZMR5TPP330 plugs ready just in case...thank goodness!
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      09-02-2017, 05:27 PM   #5
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I am getting ready to do this as well, looking forward to a video procedure.

Where did you buy the plugs?
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