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Old 09-26-2010, 01:06 PM
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Radian Radian is offline
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Location: Tucson, AZ
 
Join Date: Aug 2010
Posts: 685
Mein Auto: '91 535i 5-spd
Well, to answer the second question carb cleaner and the GM TEC product are entirely two different animals.

The TEC is freaking pungent stuff and a dark cloudy grey in color right from the bottle. It doesn't evaporate and is more viscous than carb cleaner. It's also considerably more expensive. FYI - The bottle pictured below has been superseded by a newer product called Upper Engine & Fuel Injector Cleaner. GM claims to have made some improvements to the formula. If so, that's gotta be some pretty effective cleaner.

As for developing an on-engine procedure...I think following the directions on the product is about as good as it's gonna get without dissecting the engine. The location of our sparkplug holes and the slanted block don't lend themselves well to pouring the stuff into the cylinder and getting it back out again. In addition, the treatment wouldn't touch the valve seats, intake ports, or the vast interior of the plenum this way. Given the nature of the deposits and where they occur, there's only so much one could hope to do in terms solvent cleaning and sending the junk out the exhaust pipe.
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