Knock, knock, who's there? Engine trouble. - The 1947 - Present Chevrolet & GMC Truck Message Board Network

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Knock, knock, who's there? Engine trouble.

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07-16-2011, 12:48 AM	#1
lucam Registered User Join Date: Jun 2011 Location: Milwaukee WI Posts: 12	Knock, knock, who's there? Engine trouble. 1986 Suburban, carb, 350, no mods to engine, 72k. I have a knock at idle @ startup on warm days. It doesn't do it once it's warm. I have replaced Plugs, Wires and Distributor cap (they needed it). No signs of foul play on anything. Running 93 octane gas seems to help. Is it timing?

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