I'll get to the title in a minute. After reading up on CGP about doing a GM Top Engine Clean I decided to go ahead and do it today. It requires an oil change afterwards and I'm due for one so why not do this as well.
Thanks to Jason Penneman for this information
First of all the goods you will need:
GM part number 1050002 – GM top engine clean
Full set of new spark plugs if current plugs are old
Oil and oil filter
2 feet of 9/32 inside diameter hose (Auto Zone or other parts store will carry this)
**The last step in this process involves an oil change, so you may want to wait until it is time to change your oil before doing this**
The actual operation:
1. Pull the middle vacuum line off the top of the blower by the throttle body.(There should be 3). Run a line from there into ¾ of the can and mark the hose your using to keep it ¾ submerged.
2. Start the car (Your car will need to be at operating temp before proceeding) and put the line into the bottle of top engine clean. Have someone hold the RPMs up because the car will want to stall. The car will smoke a lot during this part of the process. This is normal
3. After 3/4 of the bottle has gone in let off the gas and let the car choke on it and die. If it doesn’t feel like it is going to die, turn the car off anyway.
4. Let it sit for 20-30 minutes (soaks during this time) then start the car and let it suck the rest of the contents of the can.
5. Reattach the stock vacuum line.
6. After that, drive (Aggressively) to get the rest of the stuff out for a few minutes. Do this at night or away from everyone. It will smoke quite a bit.
7. Perform a fresh oil and filter change.
Now for the pics:
Here are the goods! You only need 1 can but I bought 2 just in case (was hard to find a dealer who stocked it). The carb cleaner I used to check for vacuum leaks.
The middle vaccum port is the I used. If you are NA then a suitable small vacuum line should work
The setup installed and ready to go:
2 things, this produced a TON
of smoke, I think I had neighboors ready to call the fire department. You might need 2 people to do this as the car really wants to die upon initial start. Someone needs to hold the throttle open a bit to keep it running so it sucks the stuff in. I'm currently in the "let it soak" phase and will finish it up soon. A lot of people call this knock reducer in a can because it removes all the carbon buildup on the valves and in the cylinders reducing pressure buildup and hence KR. i'll get taps on the car once its done to see if it helped at all. The cleaner was about 6.50 a can, tube cost 1.50. If your high mileage expect some improvement for sure. I would say this should be part of a tune-up. Remember to change your oil aftewards as all the engine crap gets deposited into the oil.[/b]