The other day my friend took his 94 Blazer to have a Motor Vac done. Before having htis done the car had a pretty bad flutter at idle and would stall out occasionally. The mecahnic said that it was due to carbon build up (102,000 miles) The motor vac cleaned the engine out and the ar runs perfect, and gets much better fuel milage. I might do this to my 300E. What do you think about it guys.?

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"Damn the torpedos, four bells full speed ahead"
-Admiral Farragut




-1987 300E Smoke Silver
-1997 S320 Black on Black
-Soon To be E55 AMG
-27 foot Grady White Offshore Sportfish.

Its been a hard sell for me, but I am now thoroughly convinced of its usefulness.

Its value is mostly in rough idle conditions but can do miracles in carboned up motors. A very similar job can be done inexpensively with a can of X66p and a length of Vacuum line. X66p is an AC Delco product. It comes in a pop top can. The instructions are on the can, but basically you warm up the motor and then pull off a central vacuum line (one going into the common plenum)and add the length of hose into the can. Run the motor while sucking the elixer through the line; don't allow the flow rate to kill the motor. It should take a few minutes to empty the can. Shut-off the motor and let it sit 15-20 minutes. Then start the thing and find a deserted road to clear the mosquitoes from. Seriously, don't drive it down main street they may call the EPA on you.

The Motovac unit also cleans the injector fuel rail and inlet screen by a closed loop external fuel system. The concept here is to pick up the dirt by flowing the solution over the top of the injector. The dirt is often insoluble and won't pass through the inlet screen but this process seems to work. It also seems to work much better on Domestic injectors than on Bosch injectors. This is a conclusion based upon many stories told. We see so few injector problems that we don't use it.

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Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician

I have used this chemical on many of my Ford racecars. The product is available at any GM dealer and is listed as "GM top-engine cleaner", and it does work wonders.
What about this for diesels, I understand that diesels with these sort of cleaners are a BIG NO NO!!!

I had this done on my car when I moved to Ontario because the car wouldn't pass the hydrocarbon test that is part of the emissions certification. They did the Motorvac and then told me to drive the car really hard for a few days to burn off the residual chemicals and loosened up crud. I did and the car passed - by one point. A pass is a pass I guess, but I still have a rough idle I can't get rid off. If anything it seems to be worse after the Motorvac. My new Mechanic said it was probably a clogged injector or something and suggested I try one of those fuel treatments. I used Castrol Syntec exactly as directed with no results to my rough idle. I do know that Motorvac must clean yuour engine quite well becuase after they did it on my car and I drove it hard for a few days I changed the oil and man was it dirty (only two months old). I couldn't believe it. I suggest if you get a motor vac done to change your oil shortly after

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Jason Priest
1999 E430
1995 E420 - retired
1986 420SEL - retired