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08-22-2014, 04:22 PM
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#1 |
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Registered User
Join Date: Jun 2007
Location: Cape Coral, Florida
Posts: 1,123
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Rattle on Light Acceleration
My 86 has a rattle sound from the engine when warm on light acceleration and ut drives me nuts. It goes away if i push harder on the gas and i dont hear it any other times. I have an all original 305 with 169k and was wondering that the noise could possibly be valvetrain. Even with hydraulic lifters does lash ever need to be adjusted? Any other ideas?
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1986 Custom Deluxe 10 1978 Caprice 2 door - sold 1937 Chevrolet 2 door sedan - project |
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08-22-2014, 04:35 PM
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#2 |
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Registered User
Join Date: Feb 2012
Location: Beautiful BC, Canada, eh?!
Posts: 2,265
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Re: Rattle on Light Acceleration
Could be excessive vacuum advance. Try disconnecting the hose from the vac can and the plug the hose, and see if it goes away.
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1961 Apache: "Grabber Orange" Shortboxed, pancake, step-notch, air-ride, turbo, LS 1977 Silverado: Shortboxed & dropped, potato-potato V8 Pontiac Firefly (Chevy Sprint): The ultimate engine swap: 5.7L in a 1.0L bag Lotus Super 7 Replica: Scratch-built street-legal rollerskate |
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08-22-2014, 06:28 PM
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#3 |
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Registered User
Join Date: Jun 2007
Location: Cape Coral, Florida
Posts: 1,123
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Re: Rattle on Light Acceleration
Thats an easy check, will do. Its been doing it since i bought it in 08 with 105k, just bugging me more lately
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1986 Custom Deluxe 10 1978 Caprice 2 door - sold 1937 Chevrolet 2 door sedan - project |
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08-23-2014, 09:16 PM
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#4 |
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Registered User
Join Date: May 2009
Location: Motor City
Posts: 9,226
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Re: Rattle on Light Acceleration
A rattle like spark knock, or something external to the engine like a heat shield buzzing, etc?
Does it occur any time you are at a particular engine RPM, or is it load dependent? K
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Chevrolet Flint Assembly 1979-1986 GM Full Size Truck Engineering 1986 - 2019 Intro from an Old Assembly Guy: http://67-72chevytrucks.com/vboard/s...d.php?t=342926 My Pontiac story: http://forums.maxperformanceinc.com/...d.php?t=560524 Chevelle intro: http://www.superchevy.com/features/s...hevy-chevelle/ |
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08-23-2014, 10:43 PM
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#5 |
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Registered User
Join Date: Jun 2007
Location: Cape Coral, Florida
Posts: 1,123
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Re: Rattle on Light Acceleration
I was originally thinking spark knock but octane and lowering timing never changes it. It could be that still tho. Its not external and happens on tip in like when i come to an incline, where you give it just a little more without down shifting or opening secondaries
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1986 Custom Deluxe 10 1978 Caprice 2 door - sold 1937 Chevrolet 2 door sedan - project |
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