Denso Iridium spark plugs (stock v. new)
Thread Starter
Evolving Member
Joined: Jul 2003
Posts: 230
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From: Fort Worth, Tx
new plugs Lancer ES LS and OZ Rally
I bought denso iridium Plugs for my car and the difference was amazing. The thing that got my attention was the condition of the OEM plugs. My car has only 32000 miles and the plugs were scorched 
Last edited by rbbcustom; Aug 21, 2003 at 11:57 PM.
Thread Starter
Evolving Member
Joined: Jul 2003
Posts: 230
Likes: 0
From: Fort Worth, Tx
denso iridium plugs
some part stores dont show to carry plugs for the lancer but here is the part number
5303#4
I had to do alot of research to get the part number that part stores show in their stock.
I replaced my plugs at 32k miles and the condition of the old plugs amazed me. attached are pics so you can see what the plugs look like at 32k miles.
5303#4
I had to do alot of research to get the part number that part stores show in their stock.
I replaced my plugs at 32k miles and the condition of the old plugs amazed me. attached are pics so you can see what the plugs look like at 32k miles.
Last edited by rbbcustom; Aug 22, 2003 at 12:55 AM.
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Joined: Jan 2003
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that dirty condition of the plugs prolly has something to do with the stock a/f ratio being so rich... did you notice any power gains or better idling with those iridiums (i.e. were they worthe 60 bucks?)
Last edited by pickleknock; Aug 22, 2003 at 12:02 AM.
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I have NGK iridium plugs and unless Denso has some secret ingredient in their plugs, there isn't a HUGE gain, if any at all from changing out plugs. The most you'll get is easier warmup time on cold starts, smoother acceleration, and a little better gas mileage.
why is this posted in the EVO forum??
Anywho, my stock plugs were in perfect condition after 5000 miles. They were light brown, and by looking at several charts that means everything is burning excellent. I went ahead and swapped in some HKS G45's though. They are heat level 8 and should be a little safeguard against knock at my 1.4 bar of boost. These plugs are TOP notch, made by NGK I believe.. they just have an HKS logo on them. They are Iridium and they are pregapped to .025, perfect for the EVOs. Best set of plugs money can buy and at $18 a piece they are $12 less than the stock IGR7AG plugs (heat range 7).
Anywho, my stock plugs were in perfect condition after 5000 miles. They were light brown, and by looking at several charts that means everything is burning excellent. I went ahead and swapped in some HKS G45's though. They are heat level 8 and should be a little safeguard against knock at my 1.4 bar of boost. These plugs are TOP notch, made by NGK I believe.. they just have an HKS logo on them. They are Iridium and they are pregapped to .025, perfect for the EVOs. Best set of plugs money can buy and at $18 a piece they are $12 less than the stock IGR7AG plugs (heat range 7).
Originally posted by ghostrider
The most you'll get is easier warmup time on cold starts, smoother acceleration, and a little better gas mileage.
The most you'll get is easier warmup time on cold starts, smoother acceleration, and a little better gas mileage.
