Idle Creep - Forums - Official C3 Vette Registry

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Topic: Idle Creep

in Forum: C3 Fuel, Emission Control, and Exhaust Systems

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Idle Creep (1/3)
9/27/14 12:05pm

Feet
Limited Member
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Grantsville, UT - USA

Vette(s):
1978 25th Anniversary 350, 4spd

Joined: 7/11/2013
Posts: 6

I installed a holley carb on my 1978 L48, the car runs great but the idle keeps creeping up after the car is driven for a while. I start out at 800 rpm but after it gets warmed up good the idle goes up to 1000, could this be a fuel pressure problem, do I need a fuel pressure regulator? Any ideas??

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Re: Idle Creep (2/3)
9/27/14 9:47pm

Sarge81

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WEST SENECA, NY - USA

Vette(s):
1981 Blue Ice Met. w/pearl ghost flames TKO500 5speed. LS1 Swap 3.45 Dana 44.

Joined: 12/3/2001
Posts: 2379

I'm assuming it has a electric choke. If so make sure the the fast idle screw is off the fast idle cam (located behind the choke thermostat).

If the choke is fully disengaged try "whiffing" some propane around the base of the carb and around where the intake manifold seals to the cylinder heads while the engine is running. If there is a vacuum leak the engine rpm's will rise slightly.

______________

GEN III 5.7L "LS6" Engine swap
TKO500 5 spd.

3.54 Dana 44

'69 "N11" Sidepipes
Borgeson Steering Box
Born 8/1981
Sequence #3975

Click here to see more pics of my Vette on CarDomain.

Lifetime Member #26

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Re: Idle Creep (3/3)
9/28/14 1:08pm

Feet
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Grantsville, UT - USA

Vette(s):
1978 25th Anniversary 350, 4spd

Joined: 7/11/2013
Posts: 6

Thanks Sarge81 I will take a closer look!

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