| Removing carbon buildup [message #229059] |
Sat, 09 November 2013 15:18  |
biggreen
Messages: 347
Registered: June 2011
Location: Northeast Florida
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Senior Member |
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I'm not able to use my GMC as much as I would like so it sits in the garage. I start and run it to operating temp a few times a month, and take it out for a short drive when I can. I know it needs to be run good and hard, but due to a number of circumstances, that has not happened lately.
I started it today and see some carbon near the tailpipe, and a slight noise like a faint knock in the engine. From experience, I know this is carbon build up in the combustion chambers.
Years ago I had a 79 Cadillac with a 425 that knocked like crazy from not being driven far. Took it to an old mechanic buddy of mine and he trickled transmission fluid down the carb at about 2500-3000 rpm and the pile of carbon out the tailpipe was unbelievable! And the knocking stopped.
Anyone heard of this trick, and is it recommended still? Anything better come along? Mine is a 77 with a 403 with 53000 miles. Thanks.
R.D.
Northeast Florida
77 ex-Palm Beach 403
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