High Idle - Team Camaro Tech
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post #1 of 3 (permalink) Old Nov 19th, 05, 11:35 AM Thread Starter
Join Date: Aug 2002
Posts: 119
Question High Idle

I have a 355 with a 501 lift cam 292 duration....I'm running with a 327/350hp vette intake and a holly 750 single pumper ontop headers ect ect ect....4 spd car with disk brakes....the thing is that the car will take a long time to idle down...mmmmmm....a couple of people have told me to drill a 1/8 inch hole in the carb butterfly to let a bit more air in.......mmm....any thoughts ? any ideas on what I should be looking at ? ALL parts are new on this thing...except the distributor...it has a pertronix system in it...but...could the dist cause this ?

Thanks for your help..

Johnny in AZ is offline  
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post #2 of 3 (permalink) Old Nov 19th, 05, 11:39 AM
Senior Tech
Join Date: Oct 2005
Location: Rhode Island
Posts: 1,356
Re: High Idle

I have experienced this before (more than once) and it was simply a weak throttle return spring.

Another possibility is that the secondary butterflies are not closing all the way. There is an adjustment screw located underneath the card which needs to be PERFECTLY set, in order for butterflies to close properly.

Also, could be sticking choke mechanism.

I bet a cold one that your problem is one of those three things. Of course, it could be something else, but those are my guesses.......................

Dave F. in Rhode Island
'68 Camaro SS Accel DFI 454 (SOLD - I'm a boring Corvette owner now)
Bought my first big-block Chevy in 1970
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post #3 of 3 (permalink) Old Nov 19th, 05, 11:40 AM Thread Starter
Join Date: Aug 2002
Posts: 119
Re: High Idle

return spring is new and tight....I'll have a look at the adjustment on the carb..
Johnny in AZ is offline  
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