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Old 04-27-2006, 09:09 PM   #1
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Default Seafoam Bad? Nah.....

Back some time ago, i ran a whole can of seafoam in a tank of gas <directions say 1/2 can for up to 25 gallons, i run 12>. during that tank of gas, i noticed better sounding exaust, and less dieseling. when i filled up, i also noticed that i only got 7 mpg with the seafoam. i was ticked, but i guess with results comes a price. ever since then, i have noticed a steady drop in fuel mileage, from 14 mpg, to 12 now.


any ideas? air filter was nice and pretty, vacuum system is a mess <always has been though>, and the pcv valve was fine <but no breather filter, until now >. any ideas? it all started with the seafoam...
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Old 04-27-2006, 09:13 PM   #2
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Any other symptoms other than poor mileage?
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Old 04-27-2006, 09:18 PM   #3
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Any other symptoms other than poor mileage?
Spark plugs were put in 2 weeks ago. old ones were dirty, but i broke one so i replaced them.

car wont run as hard wide open as it will not quite wide open. car runs like crap <outrun by a geo metro crap> after being driven for a while then shut off, but this is all been around since i had the car. doesnt quite seem to have the bite that it used to before the seafoam though.
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Old 04-27-2006, 09:19 PM   #4
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Quote:
Originally Posted by rjolly87
Quote:
Originally Posted by MyLittleBlackBird
Any other symptoms other than poor mileage?
Spark plugs were put in 2 weeks ago. old ones were dirty, but i broke one so i replaced them.

car wont run as hard wide open as it will not quite wide open. car runs like crap <outrun by a geo metro crap> after being driven for a while then shut off, but this is all been around since i had the car. doesnt quite seem to have the bite that it used to before the seafoam though.
your cat is clogged
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Old 04-27-2006, 09:20 PM   #5
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You might be amazed how a bad vacuum system can affect things.
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Old 04-27-2006, 09:22 PM   #6
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Originally Posted by MyLittleBlackBird
Any other symptoms other than poor mileage?
Spark plugs were put in 2 weeks ago. old ones were dirty, but i broke one so i replaced them.

car wont run as hard wide open as it will not quite wide open. car runs like crap <outrun by a geo metro crap> after being driven for a while then shut off, but this is all been around since i had the car. doesnt quite seem to have the bite that it used to before the seafoam though.
your cat is clogged
doubt it. just had a high flow installed back in november and a glass pack put on too when i found the back half of the cat in the muffler
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Old 04-27-2006, 11:35 PM   #7
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I'd look at the spark plugs again. Keep them in order so if any look bad you'll know which cylinder they came from.
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Old 04-27-2006, 11:53 PM   #8
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could the seafoam have killed the o2 sensor?
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Old 04-28-2006, 02:38 AM   #9
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Originally Posted by NERV
could the seafoam have killed the o2 sensor?
I second that...if your car was running better after seafoaming it, it probably burnt off a bunch of nasty crap that can screw up your O2 sensor...defineetely a thought.

I wouldnt rule out the clogged cat either, if a bunch of stuff got shook loose inside the engine it could very likely clog up the cat, even if you did have a new one.
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Old 04-28-2006, 09:03 AM   #10
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Quote:
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could the seafoam have killed the o2 sensor?
Put a scan tool on it see how the O2'* reading.
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