I was recently having problems in achieving wot and any speed above 65 downhill with a tailwind in the ol gal lately. I was not going to do a carb rebuild so I gave seafoam a shot! A splash down the carb and about 1/4 can through the brake vacuum line and it runs like a champ! The neighborhood had a new weather pattern to say the least! One more session and I'll be able to tow the skeeter again! I was amazed on how much it can wake an old motor up that has been sitting! I'm a believer now!
I still can't figure out though why the 20r struggles to get above 20mpg's?
Luke

 

Nice. Yeah, seafoam can work miracles. Fuel economy can be sticky...there's just a lot of things it could be. I've got a rebuilt engine and carb, and I don't get above 20.

Things to check, though: tuneup (including plugs, wires, disty cap, rotor, check timing, valve clearances), make sure all the vacuum crap is functioning (probably my problem), make sure brakes aren't dragging, wheel bearings are good, cat isn't plugged.

But depending on your setup, like what size tires, lift, what kind of exhaust and all that, you may be getting the best your engine can do.

 

This is an old motor and carb, Its a stock truck, just wider tires but same diameter. I know someone removed the smog crap, but it runs pretty good.

 

Where can you buy this "seafoam"??
I've never heard of it!

 

My 20R runs perfect and gets about 18-21 with 32s and 4.10s.

Most auto parts stores.

 

I firmly stand by the stuff. Worth every penny.

 

Yup I've cleared up5-6 vehicles idling problems with seafoam...it'd awesome..and another thing to check with fuel mileage is your wheelbearings and brake drag

 

Curious question... Why would you put seafoam in your vacuum ports?? Or in other words what all is seafoam good for... THanks

 

The point is to get the most direct route into the intake. Sucking it up through (brake booster maybe?) I guess helps spread it more evenly through the intake and cylinders. There is some debate on whether it's any more effective than just sucking some water up in there...essentially what you're doing is steam cleaning your intake. Burning out all the carbon build up in there and allowing it to run better.

Just pouring it into the carb for some reason won't do that as well, though you do want to pour some in there. I don't know quite enough about how exactly my intake works to really answer, but this is what the directions say.

 

so you think this would work on a freshly cleaned intake? i mean will it help the whole system all the way to the cylinders or is it just good for the intake/carb? im gonna have to pick some of this stuff up and try it when i swap my head(chain is rattling i dont have a spacer so im gonna put a good head on it.) how much does this stuff go for at the auto stores?

 

I'd advise you to do a google search, or just search this site. There are a lot of long, sometimes heated conversations on the internet about the stuff.

I believe it also cleans out the cylinders a bit when used correctly. Don't remember the price at the store...

 

seafoam is sold at walmarts and local auto parts stores,aswell as marine supply stores.
about $10 a pint.
i been using the stuff for about 10 years.
have always seen and felt results after direct injecting through a vacume line.

i inject about 1/4 of a can to the intake on high idle,pour 1/4 into the carb.....then dump the remaining 1/2 can into the fuel tank.

as stated ....seafoam will clean out your engins intake and combustion chambers.....but be aware that the cat converter can become clooged with all that carbon,causing sluggish acceleration.
if the engine cant breath......it can rev and pull stumps.

i always disconnect my exhaust for seafoaming,to avoid clogging my cat.
it may seem expensive to replace exhaust gasket every 6 mths.....but its still cheaper than a new cat.

 

Seafoam can also be used as a fuel stabilizer.

 

I like to put a third in my gas tank, a third in my oil crankcase, and a third in my pcv valve. Doesn't ever give me too much of a smoke show in the truck, but every car i've ever done it to has resulted in neighbors calling the fire department haha

 

Seafoamed my 86 last week. 1/2 can through brake booster, the other half in the tank. mileage went from 21.3 to 23.6.