I put a tin of Carbon Blast thru the engine last night as I suspected it was sorta gummed up from a lot of running around town with the PO.
What a difference it made..it is like a different car. It no longer stumbles on acceleration and responds as it should...if I wasnt going to repaint my intake and valve covers i wouldnt be removing them and going thru the top end as I intend to do. I put 250 ml of water thru after i let the treatment sit for 20 minutes to flush the gunge away and was amazed with what came out the exhaust. Just thought i would share this with folk as it has made a noticable difference to the car and performance.

 

what could it possibly change? did you run it in the gas or spray it down the intake?

 

so you put cleaner through the engine, then WATER........or was this in the removed intake?

 

Water has been a well-known carbon remover for decades -- just dribble it in the intake while you rev the engine and it will steam-clean the cylinders. I've used this method on many different cars, but I'm not sure I'd try it on a car with a MAF.

 

You generally put this kind of stuff into a vucuum port that feeds all cylinders as evenly as possible. Then let the engine run till it is gone and then let the engine sit for a while. There is a process explained on the product generally, some get a noticable difference and some do not. Depends on the car and its condition. Good for a smoke show if the car really needs the stuff!

 

Where did you get it from? I have never heard of it.

 

Most likely an Aussie product.

 

This process has been around longer than most of us. I remember my Dad pouring this stuff in his trucks back in the 60s to clean out the engine after he would get about 75K miles on them. Basically warm up the truck, hold a high idle and slowly pour the stuff directly in the carb, then let it sit for awhile and run it at high idle again for awhile. I will never forget the huge clouds of smoke it would make when he did this.

 

We used "TEC", called Top Engine Cleaner at the Chevy garage in the early 70's. This was for carbon knocks in SB Chevys. It worked, believe it or not. Just as David said. It came in a blue can, GM part number and everything. I can't imagine how the procedure would work in a 'modern' car.

 

SeaFoam, one of the more popular ones that has been around forever.

http://www.seafoamsales.com/motorTuneUpTechGas.htm

 

The GM Top Engine Cleaner works well, but it was much easier to pour it down the carb than it is to get in into a 928 without blasting the tiny platinum wire and the exposed electronics in the MAF...

My preferred method was always to wait until dark on Friday, so the neighbors didn't get in a frenzy, get the engine fully warmed up, and dribble half the can in at a fast idle, then dump the rest of the can in more quickly. This would kill the engine. Turn the ignition off, and wait until Saturday morning. On Saturday morning, I would hit the Interstate, and do what was known in the South as "Blow the soot out of it".

The main ingredient is butyl cellosolve. It will get much of the carbon off the intake valves, which seems to be the primary benefit on older vehicles.

 

Yes, the key idea was to kill the thing with the last of the can and then let it sit a bit.

 

That's easy, on an S4 and later just remove the hose on the drivers side of the filler neck and let vacuum do the work directly into the air guide. On the ealier 928s use the hose that goes from the oil filler neck/lid to the air guide. Both of these will suck in the stuff after the MAF or air Flow Meter and do no harm.

This would accomplish the same thing as using the "PCV valve procedure" described by most makers of this stuff.

 

That should also wash the oil out of the intake.

 

Yep, then install a Provent System and never have oil back in there again