Dealer ripoff in works? Combustion chamber clean?

[cstreit]

http://forums.pelicanparts.com/general-car-truck-questions-discussion/124693-bad-sounds-coming-engine.html#post935385

[MotoSook]

Somebody gettting tired of the 911 forum?

De-carbon the chamber????? That must be powerful de-ionized water for $100.

[KTL]

The dealer can do it two ways that I know of.

1. Put in a bottle of stuff like you or I would do and charge $100.

2. Hook up a specialized assembly that connects to the fuel rails and supplies the engine with the detergent. I think the car is ran in the shop with this cleaning system on it, thus cleaning the crud out of the injectors, intake & exhaust ports and valves. Can't remember the specifics, but I do remember reading something somewhere about this procedure.

[MotoSook]

MotorVac fuel system cleaning?

[nostatic]

56K miles on factory plugs?

[Freeman]

Thread on de-carboning:

De-carboning with water...

[jluetjen]

$100 to have that done at a Mazda dealer, dare I ask what a Porsche dealer would charge???

Never mind -- I don't want to know.

[KTL]

That water trick is too cool. I never knew that!

I'll have to try that on my brother's 65 Chevy II. Kinda like, "Hey, watch this.............." He'll freak.

[MotoSook]

Someone on this board told me a sport water bottle and a hose into one of the vacuum ports on a cis motor works great...shh..don't tell anyone. I'm opening a shop and charging $100 bucks a pop.

[LeeH]

I had a Honda Prelude Si that I used to autocross. It had a stumble and rough idle. Tried several things to fix it, but I just got used to the idea it would always be there.

While getting an $8 oil change (hey, this was a while back) the manager of the place said he could fix it for $25. I told I'd pay that if it fixed the problem, but wouldn't if it didn't. He took the challenge. He hooked a line directly to the fuel rail and the other end to a bottle that looked like an IV bottle. The car smoked terribly while the stuff ran through, but that car never stumbled again!

[Doug Zielke]

A local guy has a 2.7 that ran like $hit. Had all the symptoms of a lot of carbon in the motor.
This is how I fixed it for him:

1). Took the car for a long ride to get it good and hot.
2). Bought a large bottle of Techron.
3). Increased the idle speed to 1500+ rpm.
4). Took off a vac line from the distributor.
5). Placed the end of the line into the bottle of Techron. (If the motor wants to gag, pull the line out of the bottle until it clears, then keep going until the bottle is m-t). Replace the distributor vac line.
Warning: Prepare for quite a bit of smoke from the exhaust.
6). Take the car for another brisk drive to finish off any residual carbon.

[indigowhale]

Ok I am convinced, sounds better than an "Italian Tune Up".

Don't want to fool with the cat converter, has anybody done it with the cat o and have it ruined?

I got 2 years before my next emissions and the cat bolts are rusted out. Need a torch to get them off.

BG44K may be in trouble if word gets out

Indigowhale

[MrKJBlue]

I carried this out on my CIS last week, first I tried it on the distributer vacuum hose but the suction was too weak so I ran a pipe from the decel valve this pulled up a litre of water in about 5 sec's at 3k rpm I ran 1 bottle of redex (techron type carb cleaner) and 4 litres of de-ionised water.

Scared the hell out of the neighbours but worked a treat,

It REALLY made a big differnce to to engine power, I also changed to Swepco that weekend and the change to the engine through the decarbon was far greater than the change swepco made to the gearbox.

[MotoSook]

De-carbonizing the Fat Bastard

[ubiquity0]

Originally posted by MrKJBlue
I carried this out on my CIS last week, first I tried it on the distributer vacuum hose but the suction was too weak so I ran a pipe from the decel valve this pulled up a litre of water in about 5 sec's at 3k rpm I ran 1 bottle of redex (techron type carb cleaner) and 4 litres of de-ionised water.

Scared the hell out of the neighbours but worked a treat,

It REALLY made a big differnce to to engine power, I also changed to Swepco that weekend and the change to the engine through the decarbon was far greater than the change swepco made to the gearbox.

Did you use the small vacuum line that connects to the 'nipple' on the decel valve?

[MrKJBlue]

Yes, I just connected a longer pipe to the T-connector.

[masraum]

I'd love to do this, but I'm not sure what a ton of carbon would do to the catalytic converter.

[red-beard]

In the Large Turbomachinery business, we run untreated crude oil in some of the machines. Unfortunately, some of the high end fraction waxes burn and create carbon deposits in the hot section (The area of the Turbine downstream of the combustion chamber, typically, the first stage nozzle). The machine is "de-tuned" or run at a lower power level while running on crude and afterwards until the machine is "Water Washed". De-ionized water is sprayed into the unit on a "spin" cycle to help knock off the carbon. The carbon absorbes water and then explodes off the hot section parts on the next full operational run.

Something similar may be happening here. After getting rid of the carbon, I'd figure out why you're getting the carbon.

[yeuporsch]

I was told that if one uses water to decarbonise, it may over heat and damage the valve and valve guide. Is this true?

John

[KTL]

I've heard that carbon is nothing to be concerned about and it's just a waste of time to even bother with it.

So you Heavy Industry guys (and everybody else too) are just wasting your time and flushing big $$$$ down the crapper.......................

Hmmm.......... Methinks there's some merit to keeping the combustion chamber clean. Let the debate continue.