Seafoam

**apierce1289** · 03-23-2012

I wanna do my yearly seafoam treatment through the brake booster line and I was wondering if it will ruin my spark plugs that are currently in the car and will it damage my bosch o2 sensor?

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**TLSheff** · 03-23-2012

02 sensor not so much, I would suggest picking up a cheap set of plugs if your running expensive iridium's. I've seen it foul them out before, sometimes it doesn't but wouldn't hurt to have a backup.

**apierce1289** · 03-23-2012

Will it help my gas mileage at all? Because right now I'm getting 20 miles to the gallon.

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**blueguy** · 03-23-2012

Maybe it needs a tune up instead of a seafoaming.

**apierce1289** · 03-23-2012

I did SD headers and removed the catalytic converter it has a new performance stainless exhaust and it has a cold air intake and an overkill pcm. I did all of this with Billboost last fall. When we did that he helped me put in new spark plugs and the new bosch o2 sensor. Also would a dirty throttle body affect my gas mileage? The pcm is tuned for 93 octane as well. And overkillwill removed everything in the pcm for my cat delete so I'm not throwing any codes.

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**Fivefingerdeathpunch** · 03-23-2012

what kind of driving do you do?

if its pretty much all city, 20 mpgs aint bad.

**stealthee** · 03-23-2012

And it also depends on how you drive.

For instance, I drove my dad's Grand Cherokee towing and got 15mpg. My dad got less than 11mpg when towing. That's a HUGE difference, just by two different styles of driving.

**apierce1289** · 03-23-2012

I guess it could be my driving cuz I'm a little heavy with my foot. But I would've thought that these grand prix get a little bit better gas mileage. I always put 93 octane in her so I'm not sure lol.

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**stealthee** · 03-23-2012

I've ran both just to see if there is a difference and there is no difference in fuel mileage between running 87 and 93 in a Supercharged Grand Prix. If I drove it harder there may have been a difference due to the different timing tables, but as it was, the difference was nil.

I continue to run 93 though because $100 a year more in gas is better than replacing an engine because of possible knock damage.

**apierce1289** · 03-23-2012

Yeah I'm gonna stick with 93 octane myself because when I asked Will to tune my pcm I told him that's what I was going to run for gas even though its NA.

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**stealthee** · 03-23-2012

Originally Posted by apierce1289

Yeah I'm gonna stick with 93 octane myself because when I asked Will to tune my pcm I told him that's what I was going to run for gas even though its NA.

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Before the ECU you were wasting your money running 93. In fact you were making it worse running 93. Depending on the timing tables of the ECU tune you may still be wasting your money. Octane doesn't add fuel mileage. Its only a knock preventer. If you don't knock on 87, you don't need anything more than 87. Higher octane is harder to burn and therefor hurts power if you run too much.