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01-02-2011, 04:36 AM
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#1 |
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Registered User
Join Date: Jan 2007
Location: Whitehorse, Yukon, Canada
Posts: 169
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Chugs between shifting gears new break-in.
What causes chugging between gear shifting? Sticking valve? Vacuum leak?
The engine lopes at idle and erratic. Could I have worn cam shaft down at break in running at idle too long to find timing issues. The engine is a 283 with vortec heads eddy carb 500 cfm and intake, mild cam.
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01-02-2011, 06:38 AM
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#2 |
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Senior Member
Join Date: Jul 2001
Location: Muskegon,MI,USA
Posts: 6,026
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Re: Chugs between shifting gears new break-in.
Have you tried readjusting the valves?
Jim
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1971 Shortbox step side 4x4, 350 sbc, 3:07 rear end 1965 Impala SS 400 sbc, Muncie rock crusher 1966 Impala SS 396 bbc, TH 400 1969 El Camino, 350 sbc, TH 350 1971 Snowplow built on a Blazer frame 1972 GMC Short bed, stepside, TH 400, 427 BBC |
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01-02-2011, 11:26 AM
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#3 |
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Registered User
Join Date: Oct 2005
Location: Overland Park, Ks.
Posts: 5,228
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Re: Chugs between shifting gears new break-in.
.What are the cam specs? Sounds like you have a bad vacuum leak or too much cam for the engine. A 283 can't handle as much cam as a 350.
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01-02-2011, 02:20 PM
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#4 |
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Registered User
Join Date: Jan 2007
Location: Whitehorse, Yukon, Canada
Posts: 169
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Re: Chugs between shifting gears new break-in.
With vacuum gauge hooked up needle flutters and I cannot get more than 15 inches of vacuum. Cam specs are for 283, nothing too radical. I believe the #1 cylinder has a sticking valve would this be the problem. Everything else checks out great, all components including heads are brand new. What causes the valve to stick? Valve guides?
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