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My caddy has about 75,000 miles on it i occasianally floor it and beat on it so to speak. I was readint that the northstar engines have problems with carbon deposits in the combustion chamber causing a "cold knock". I have heard you should use TEC by general motors to get rid of them, put it in the pcv valve let it soak overnight and floor it all out. it sounds like a good idea but i dont want to change the spark plugs again. i also heard that if you just drive it hard a couple of times this will get rid of the deposits just fine too. what should i do. has any one used this product how does it work.
 

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White Diamond '03 DHS (with DTS floor shift)
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86,778 Posts
An occassional WOT treatment is all you need in all but the absolute worst cases. Watch your 6 when
you do a WOT. If you don't see any black smoke (carbon), your clean. Are you experiencing any cold carbon rap?

BTW, be carefull. If you apply that stuff wrong you can hydrolock the engine.
 

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2010 Black Cherry CTS AWD
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263 Posts
It also helps when you do the WOT like Ranger said. They're really fun too, just put the windows down so you hear the N* sing to you.
 
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