Last post on Jun 03, 2012 at 4:22 PM
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Cadillac DeVille, Sedan
#5 of 6 Re: Remove Carbon from Northstar engine [swwjr05]
Jun 12, 2009 (12:08 pm)
As the owner of as '99 STS that carboned up, and was cleaned by the dealer, under warranty, I can tell you that WOT works best!
After a few WOT runs, my oil consumption went down. I was burning a quart about every 2000 to 2500 miles. After WOT, I would get another 1000 more miles per quart.
The Northstar is a performance engine and needs to be pushed every once in a while. As another senior citizen, I can tell you that we do too! Get in there and push that pedal down, you'll love it!
#6 of 6 Carbon buildup
Jun 03, 2012 (4:22 pm)
O.K. Guys this one is real easy.I am a master mechanic of 32 years and the old "tricks" still work best. Get a small cap of water bring the RPMs up to around 2500 slowley pour the water in to the intake the motor will bog down a bit if done right increase throtle to keep from stalling.only use about 4 OZ of water after this the motor will run perfect.And I do this to my customers cars without charge.A little know how goes a long way, Hope this helps some of you out there.