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Old 01-28-2009, 11:40 PM   #1 (permalink)
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Join Date: Dec 2007
Location: Southern California
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1999 Saturn SW2 - '99 Saturn SW2 Wagon
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New set of Denso Iridium Spark Plugs ...

Hello -

During the end-of-year holidays I was having a lot of crummy tanks. Part of this was due to the cold weather, and part of this was due to unpredictable XMas traffic. But after the holidays, something didn't feel right. For about 70K miles I have had Denso Iridium spark plugs installed, and I have been happy with them. As one of my XMas presents (for my car), I got a new set of Densos. Here is an old/new comparison of the tips of the Densos :

The old tip has lost maybe 24% of it's height from the white ceramic base.

Here are the specs on these plugs :

At the same I changed my plugs, I did other things to the car :

- New set of Denso Iridium Spark Plugs
- Synthetic oil change, Union 76 10W/30 (mechanic normally has dyno oil, but had synthetic on hand)
- "Piston Soak" to clean carbon off of pistons
- Switch to 91 Octane
- Adding Redline Fuel Injector cleaner
- 49 PSI in tires (was in low 40s due to laziness)
- Hotter drier weather
- Better traffic

With all these variables going on, my last 7 tanks have gone well :

But, because I made so many changes, it's hard to know what made the difference.

In any case, I'm happy,



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