[super_silent]

I sent an email to the folks at Sea Foam and got a quick, & really detailed reply. Here is what they wrote:

Mike it could be what you say or part of the ring is stuck in the groove due to varnish, at any rate put 4oz of SF-16 in the oil run the unit for 25 KM’s and check the oil if dirty change the oil and filter if not dirty do not worry. I would also do the following with the rest of the can. For a gas (not diesel) fuel injected car, warm up the car and make sure
it is outside as there will be a lot of smoke during and after the
application.
With the car running at running temp, lift the hood and take the brake
vacuum line off the brake booster which is located on the fire wall
driver side or take the PCV line out. Pour slowly ½ can of SF-16 down the line this will melt
the varnish that holds the carbon at the back of the intake valves and
top of the pistons, you might have to turn up the RPM’s a bit so the
car will not stall.. After ½ can down the line shut the engine off and
put the line back on . Let the unit sit for 15 minutes. Pour
the balance into the gas tank this will lubricate the fuel pump remove
moisture and clean the lines, filter and the injectors. The injectors are not too bad these days.
Now the show! Start the car and find a safe place from
a stop drive the car aggressively you need some load on the engine slow down and stop do
it again the smoke will be gone after 1KM I need the pressure (load) to
get rid of the varnish/carbon.
You will notice a better idle, better fuel economy and more power. Did
you know that Sea foam will stabilize fuel for over 2 years, and works
in all 2,
4 stroke and diesel engines?
Then do your compression test if not a mechanical problem this should bring the compression back to normal on the #7 cyl.
Regards Paul

[bondo]

Originally Posted by techron

an old timers trick called a "spring tune up", i used to use it in the 70s before doing a tune up on cars with pinging or run-on problems.

while running the engine at 2000-2500 RPMs take a 16-20 oz cup of water and SLOWLY dribble it into the carb while keeping the revs up. the water will go into the cylinders with the fuel/air and will turn to steam upon combustion and steam clean everything and blow it out the exhaust. IT WORKS!!! it's clean and if you have any doubts have a buddy put his hand a foot from the end of the exhaust pipe and and ask him how much carbon came out and hit his hand. when finished let the car idle for five minutes then change out the spark plugs.

edit--i spelled spart plugs.

Ayuh,...... Exactly,......
Why Waste money on Sea-Foam when Water is Free,+ Works Better.......

If I know I'm going to be pulling Heads,...
I'll do a Water cleaning before I start,.....

I run the motor til Warmed, run it up to 1500/2000rpms,+ pour in a 1/2Qt. of Water into the carb throat, Just fast enough to cause the motor to stumble, but not die.......
When the heads come off,......
You'll think you're looking at Brand New Unrun combustion chambers,+ pistons..............

Btw,........
The Spark Plugs will also look Brand New Clean.......

[mike's hotrods]

is it safe to do that on a tbi engine? I think I might try that

[RPM]

I have done the water thing many times it does work good.

[burnt olds]

water works great
trans fluid in oil works good on inside of motor
but i see no body mentioned the catalytic converter getting stopped up .
if you have the converter with the small bee hive comb ,it will clog up with what you blow out of the combustion chambers .
the trans fluid in the motor cleans to well sometimes , recommended for tear down after wards ,rings start blow by after to good a clean.

[302 Z28]

Auto trans fluid is a bad idea with todays catalytic converter equipped cars. Water works great, we used it a lot in the seventies to eliminate carbon knock in cars that were not pushed too hard.

Vince

[ap72]

yea ATF is good for lifters... bad for cats- We've used it a few times in a crutch. SeaFoam is amazing, and water injection has been proven for years- all good ideas.

[fitzwell]

Originally Posted by mitmaks

sea foam sounds good except I live in clean neighborhood and Im afraid my neighbors will not be happy about that.

yeah, my neighbors LOVE me

'course the ex marine on the North side thinks it's funny as hell when i do the Seafoam treatment.

Trans fluid in the crankcase about 100 mi before an oil change will clean one up real well, and not harm the bottom end.

Used to do the water thing down the intake until one of the local old timey guys (that has probably forgotten more than i'll ever know) told me that was a good way to take the head off a valve...cold water on a hot exhaust valve kinda thing.

[bondo]

told me that was a good way to take the head off a valve...cold water on a hot exhaust valve kinda thing.

Ayuh,........... Sounds like B/S to Me,........

We're talking about a Warm motor free-wheeling at maybe 1500rpms,.......
Not a motor on a Dyno at a Full Horsepower Pull........

[dawg]

Gmm sells a top cylinder cleaner aswell.
if it smokes do it at night.
I used seafoam as well with great results.
poured down the throat of the carb and 1 can in the gas tank.
you can use in the oil aswell

[onebadmerc]

The water thing works, the only problem with doing this is, pouring too much down the engine. Water is not very compressible and can hydro lock a engine or at the very least bend valve train components. I also wouldn't pour anything down a engine to clean it out that has a worn out timing chain. I done the water thing once on a old 68 Torino, broke the timing chain and damaged the valve train.

[DHMag]

pouring water in the intake is safe for EFI cars.

as for crankcase cleaning, ill drain the oil and fill the block with kerosene and let it run for a few hours, cool down, run a few more hours, cool down and drain.

[boatbob2]

a few years ago i bought a caR WITH ONLY 50,000 MILES ON IT. THE OIL HAD NEVER BEEN CHANGED(I ASSUMED)I HAD TO DRIVE IT 25 MILES TO MY HOUSE,WITH IT SPITTING AND SPUTTERING THE WHOLE WAY. WHEN I GOT IT HOME I TOOK OFF THE PAN PLUG,AND THE OIL DIDNT DRAIN,IT KINDA CAME OUT IN STRINGS. I GOT 10 GAL OF DIESEL FUEL,RAN 8 OR 9 GAL THRU THE ENGINE (PAN PLUG OUT,NOT STARTED) FINALLY IT WAS RUNNING OUT OK,.PUT THE PLUG IN,ADDED 3 QTS OF TRANS FLUID,2 QTS OF OIL,STARTED AND LET IT RUN,WENT TO DINNER,WHEN I CAME BACK OUT,IT WAS RUNNING GREAT. DRAINED ALL OIL,ADDED1 QT TRANS FLUID 4 QTS OIL. TUNED IT,PLUGS,POINTS,CONDENSER,AND REPLACED GENERATOR,LEFT NEXT DAY FOR CALIF(FROM FLORIDA) NO PROBLEMS,SHIPPED IT TO OKINAWA(I WAS IN THE ARMY) WIFE DROVE IT 4 YEARS,ONLY PROBLEM WAS A BROKEN IGNITION SWITCH. (SORRY,CAP LOCKS ON)

[grumpy1]

I have a 94 S10 blazer 4x4, 4.3 vortec, and the EGR valve keeping carboning up. I take the vacuum hose off the booster and add it directly into the running engine. I will be white smoke. Sometime it takes two doses. All will be well for about 2000 miles and I have to do it again. You can add it to the gas tank every time you fill up and skip the doseing. This stuff is a carbon remover. It is not as good on enjectors as Lucus is. When you do the dose thru the vacuum line, be sure to replace the hose, then run the car a little hard in first gear until the smoke stops. I am a firm believer in this stuff.

[dawg]

Originally Posted by DHMag

pouring water in the intake is safe for EFI cars.

as for crankcase cleaning, ill drain the oil and fill the block with kerosene and let it run for a few hours, cool down, run a few more hours, cool down and drain.

run kerosene for a few hours? I bet you got alot of blowby in that motor and a few wiped cam lobes lol