C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

Gas response issues

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Old Oct 18, 2014 | 08:43 PM
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Default Gas response issues

I just put new intake gaskets on my 1986 vette and now when you try to quickly hit the gas is seems to take a little time for the rpm to settle back to an idle. Any suggestions?
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Old Oct 19, 2014 | 12:19 AM
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Vacuum leak.
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Old Oct 19, 2014 | 12:09 PM
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yep.

go back with some water in a spray bottle and wet everything and look for where its being sucked in.
Vac fittings UNDER the TB.

all along the runners gasket. Plenum gaskets.

all around the intake itself.

probably just a runner gasket. easy to fix, common. Dirty metal surfaces do it everytime.
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Old Oct 21, 2014 | 09:45 PM
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Originally Posted by leesvet
yep.

go back with some water in a spray bottle and wet everything and look for where its being sucked in.
Vac fittings UNDER the TB.

all along the runners gasket. Plenum gaskets.

all around the intake itself.

probably just a runner gasket. easy to fix, common. Dirty metal surfaces do it everytime.
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Old Oct 21, 2014 | 09:57 PM
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Just went back and looked at the photos I took before I started and low and behold I found the connection for the hose. It goes onto the pipe that PVC also connects to. Could this be my issue?
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Old Oct 21, 2014 | 09:59 PM
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I have to put a new master cylinder on tomorrow. Any way I can do this without bleeding every cylinder?
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Old Oct 22, 2014 | 04:27 PM
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yep. IIRC that hose goes directly to the TB port.

master cyl....nope, that's almost a given, disconnect any line and ya gotta bleed that caliper.
Get some "self bleeder" screws.
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