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#51 | |
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#52 |
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Location: Kansas City, MO
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If I did have a vacuum leak, wouldn't the idle be fluctuate all the time? I just don't see who it could be leaking. I have used a vacuum pump to check all the connections and nothing seems to be leaking.
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Looking for a ZR-1 1985 Yamaha RZ350-NOT STOCK 1971 Yamaha AT1-Middle of a restoration |
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#53 |
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Here is a little video of what I am dealing with when the car is fully warmed up.
http://youtu.be/TjD4C59Q9gA
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Looking for a ZR-1 1985 Yamaha RZ350-NOT STOCK 1971 Yamaha AT1-Middle of a restoration |
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#54 |
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I had a suggestion from Marc Haibeck that it could be the PCV grommet for the valves. I checked that today and it was ziptied to the tops of the PCV valves. Is there anyway to pressure test that system?
Another thing I noticed today. If the AC is on the idle is pretty much perfect. It doesn't fluctuate at all. Is that normal? Could this all be IAC related?
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Looking for a ZR-1 1985 Yamaha RZ350-NOT STOCK 1971 Yamaha AT1-Middle of a restoration |
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#55 |
Join Date: May 2007
Location: Chicagoland, IL
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That's because the AC put a load on the motor and moved the idle to a different/richer part of the VE table. Suggests to me that your oscillating idle is due to a lean surge. The VE table at idle needs to be flattened out, probably along w the SA table altho I would look at Closed Throttle Idle SA setting.
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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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#56 | |
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#57 |
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Any idea on what to look at?
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Looking for a ZR-1 1985 Yamaha RZ350-NOT STOCK 1971 Yamaha AT1-Middle of a restoration |
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