02-11-2015 | #21 | |
Join Date: May 2007
Location: Chicagoland, IL
Posts: 9,708
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Re: Higher than normal Idle, and occasional stumble
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[SIGPIC][/SIGPIC]Former Membership Chairman Former ZR-1 Registry - BOD 1972 Corvette 4speed base Coupe SOLD long time ago 1984 Corvette Z-51/4+3 SOLD 1992 Corvette ZR-1 Aqua/Gray #474 SOLD 1992 Corvette ZR-1 Black Rose/Cognac #458 2014 Honda VFR Interceptor DX |
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02-11-2015 | #22 | |
Join Date: Aug 2009
Location: South Dakota/California
Posts: 3,797
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Re: Higher than normal Idle, and occasional stumble
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I have found in addition to that check valve failing, that the usual vacuum leaks are caused by the rubber connectors getting hard and shrink with age on the ends of the hard plastic lines. If you cannot remove the rubber connectors they probably do not need to be removed. It is the loose rubber connectors that have shrunk and leak. Or.....have disconnected themselves from the hard plastic lines. Be careful that you do not kink the hard plastic lines by excessive bending. That fits right in with the connectors getting a bit tighter as they warm up.
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Left Clickable links -Solutions- LT5 Modifications/Rebuild Tricks Low Mileage ZR-1 Restoration 1990 Corvette (L98) Modifications LT5 Eliminated Systems LT5 Added Systems LT5/ZR-1 Fluids 1995 LT5 SPECIFIC TOP END REBUILD TRICKS Last edited by Dynomite; 02-11-2015 at 12:34 PM. |
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02-11-2015 | #23 | |
Join Date: Aug 2006
Location: McLean, VA
Posts: 3,723
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Re: Higher than normal Idle, and occasional stumble
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Typically (perhaps not always), vacuum leak from the secondary vacuum system does not cause high idle nor stumbling based on my experience. |
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02-11-2015 | #24 |
Join Date: Aug 2014
Location: Kansas City, MO
Posts: 838
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Re: Higher than normal Idle, and occasional stumble
Can you get those rubber pieces new?
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Looking for a ZR-1 1985 Yamaha RZ350-NOT STOCK 1971 Yamaha AT1-Middle of a restoration |
02-11-2015 | #25 |
Join Date: Aug 2006
Location: McLean, VA
Posts: 3,723
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Re: Higher than normal Idle, and occasional stumble
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02-11-2015 | #26 |
Join Date: Jan 2015
Location: Marietta, GA USA
Posts: 1,160
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Re: Higher than normal Idle, and occasional stumble
Concur. I surprised myself when one broke in two easily when I was trying to move it off to the side while working. Luckily I was removing secondaries, so it wasn't a big deal. I guess they can get pretty brittle in that environment after a few decades.
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02-11-2015 | #27 | |
Join Date: May 2007
Location: Chicagoland, IL
Posts: 9,708
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Re: Higher than normal Idle, and occasional stumble
Quote:
Will also use tie wraps around that area.
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[SIGPIC][/SIGPIC]Former Membership Chairman Former ZR-1 Registry - BOD 1972 Corvette 4speed base Coupe SOLD long time ago 1984 Corvette Z-51/4+3 SOLD 1992 Corvette ZR-1 Aqua/Gray #474 SOLD 1992 Corvette ZR-1 Black Rose/Cognac #458 2014 Honda VFR Interceptor DX |
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