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04-29-2011, 11:30 PM
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#1 |
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Registered User
Join Date: Jul 2010
Location: Tacoma, WA........Ottawa, IL
Posts: 69
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454 idling acting weird
i tuned my carb in a last sunday, it sat til today, when i started it up it was idling around 1500 and would die when i put it in gear, i figured it was a vacuum leak, so i tightened down all the bolts on my intake, it started idling normal around 7-800 but when i gave it just a little bit of throttle it would start idling high again, at one point almost 2000, the weird thing is while it is idling high, i took 1 idle screw a 1/4 turn out and it started idling back down to normal, until i give it just a little bit of gas, my timing is where it normally is distributor has no play in it, floats where they need to be at and the idle screws at the highest vaccuum i could get, when its idling it smells like its burnin oil, and smokes a little bit, not horrible but enough for me to be worried, i cleaned up the underside of the engine to see if it will start leaking again, would an oil leak be cause of the idle thing as well
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04-30-2011, 01:34 AM
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#2 |
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My Carbon Footprint
Join Date: Oct 2008
Location: Orygun
Posts: 5,527
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Re: 454 idling acting weird
what kind of carb?
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04-30-2011, 02:31 AM
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#3 |
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Senior Member
 
Join Date: Jan 2002
Location: Williston, ND
Posts: 2,999
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Re: 454 idling acting weird
We had a problem similar to yours with the fast idle and it turned out the plugs were bad from sitting all winter. Coulda swore it was a vacuum leak, but as soon as we replaced the plugs, ran like a top again.
__________________
68 Chevy CST/10, 50th Anniversary, 327/th400, 373 posi, buckets 68 GMC Shortbox Stepside, 402/th400, Tilt, Tach, Bucket Seats, 3.08 Positraction 69 Chevy Camaro SS, 383, 4 speed, positraction 70 Chevy El Camino SS396, Triple Black, 454/th400, Tach 70 Chevy Shortbox Stepside 4x4, 350/th350, Tilt, Tach, Cab Lights, Bumper Guards, Tow Hooks 70 Chevy 3/4 Longbox, 350/auto, 70k, SURVIVOR 71 Chevy Blazer, CST, 350/auto 71 GMC Sierra K2500, 454, 4 speed, 4.10 posi, 37s 71 Custom/30, Open Road, 350/th400, tilt 72 Chevy Shortbox Fleetside, 496 Stroker/th400, Tilt, Tach, Bucket Seats, 3.42 Posi 72 GMC Sierra Grande 2500. 427/th400, tilt, a/c, tool and stowage, buckets/console, 3.54 posi |
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04-30-2011, 09:42 AM
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#4 |
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My Carbon Footprint
Join Date: Oct 2008
Location: Orygun
Posts: 5,527
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Re: 454 idling acting weird
The other thing I was going to purely guess at is the primary throttle shaft slightly hanging up on the fast idle portion of the choke or the linkage not being adusting correctly on a Holley vacuum carb and the rear throttle shaft sticking slightly can causing unmetered fuel getting into the secondaries at idle.
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04-30-2011, 10:55 AM
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#5 |
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Registered User
Join Date: Jul 2010
Location: Tacoma, WA........Ottawa, IL
Posts: 69
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Re: 454 idling acting weird
i was able to actually get in there and look at it, ended up i blew out a small chunk of my intake gasket, gonna change that oiut today hope that will be the only thing
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04-30-2011, 11:37 AM
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#6 |
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My Carbon Footprint
Join Date: Oct 2008
Location: Orygun
Posts: 5,527
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Re: 454 idling acting weird
Well that will certainly cause a problem. Lots of unmetered air getting in!
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