Oil change coming up....time to do the Top Engine Clean......a question or two please.

[c good]

I've seen most of the links to the T.E.C. procedure but just want to clarify a few things....How much of the AC Delco TEC needs to go into each cylinder? I've seen quantities from 10 oz of the liquid in each cylinder to a few squirts of the foaming cleaner? And now that I mention it....Should I go with the Liquid? Or the foaming spray?

Also, I know I have to drain the oil and replace the filter after the soak, but do I need to do another short oil change after that? Or can I just do a regular oil change and run it for the 4000 mile interval? Thanks all for any info.

P.S. Envoy still running sweet after the PCM was finally diagnosed and replaced!

 

[Mooseman]

I think the foaming one is better to get to the top of the combustion chamber. Because each cylinder will have the pistons at different positions, it will take different amounts unless you turn the engine to have each at TDC when you spray it.

I'll defer to @MRRSM as he is the SME on this stuff.

 

[c good]

That's a good point Mooseman! Thank you! For some reason I wasn't even thinking about the head/valves soaking. I was thinking the soak was mainly for the top of the pistons and the rings. Are the valves and head combustion chamber supposed to soak also? Thanks for any add'l info all.

 

[Mooseman]

Wouldn't be a bad idea. I know @MRRSM has used it a lot and got great results.

 

[mrrsm]

Coincidentally, Rick ( @rchalmers3 ) is currently troubled with a Random Misfire Problem on his 2005 Sierra LS Motor via THIS Thread ...

2005 Sierra Occasional crank/no start

Hey folks, My old but faithful 2wd workhorse (GMT800) has an unusual occurrence that has me pondering about how to approach a diagnosis. I thought I'd check with the brain trust to see if there is some existing experience to guide me. For the past few years, when starting the engine, hot or...

gmtnation.com

...and he, along with anyone else dealing with Excessive Carbon Build Up in the Combustion Chambers, Piston Heads, Valves & Valve Seats and Trapped Compression Rings would probably benefit from checking out these 'well documented threads' available concerning All There Is To Know About ACDelco Top Engine Cleaner and the proper procedures for its successful use for Carbon Busting any Engine:

A.C. Delco Foaming Top End Cleaner....

Good Evening All, I've read about this procedure here on the forum. I'm wondering if it would be OK to do, regardless of if I have carbon build up or oil consumption. I have noticed a small amount of oil accumulated in the intake plenum. I do have a little piston "slap" that goes away upon...

gmtnation.com

NEED HELP - "Top End Soak" ... question

This has probably been covered in "clips and phrases" in various threads throughout the site, but maybe we can collect valid advice and how-to's here, as well as clear up some concerns I have: I've seen multiple references to "Top End Soak" for these platforms. I believe these to refer to the...

gmtnation.com

 

[Mooseman]

Because this question about TEC comes up on a regular basis, I've added the TEC threads to the 4.2 and 5.3 FAQs.