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#1
11-18-2005, 02:49 PM
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high idle
Ive got a weird problem that just started out of nowhere. My engine is idling very high because the throttle wont return all the way by itself. I can push it the 1/8 inch to where its up against the idle screw but as soon as i push the gas and then let off it back to being stuck an 1/8 inch away from the screw. Now when the car is off and i mess with the throttle it returns just fine. Anybody got any ideas?
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92 z28 camaro 5.7 TPI current - slp intake runners and base-BBK 52mm throttle body-MSD 8.5mm wires, blaster coil, and 6AL Box-edelbrock headers-160 degree stat.-hotchkis strut tower brace waiting in the garage - LQ4, milled heads 317 casting (10.5 to 1), hardened pushrods, ported LS6 oil pump, manley dual spings with titanium retainers, MTI X1 cam, hawks longtube headers 
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#3
11-18-2005, 03:00 PM
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Re: high idle
vacuum leak would cause a rough idle wouldnt it?
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92 z28 camaro 5.7 TPI current - slp intake runners and base-BBK 52mm throttle body-MSD 8.5mm wires, blaster coil, and 6AL Box-edelbrock headers-160 degree stat.-hotchkis strut tower brace waiting in the garage - LQ4, milled heads 317 casting (10.5 to 1), hardened pushrods, ported LS6 oil pump, manley dual spings with titanium retainers, MTI X1 cam, hawks longtube headers
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#5
11-18-2005, 03:34 PM
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Re: high idle
I don't know if an exhuast leak as anything to do with, but i had similar porblems do to the manifold bolts being extremely loose. But you probably don't smell that nasty stuff anyways, so why did i even post?
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87 IROC - R.I.P, and she will never be forgotten  90 RS - The beginning of a new era... I hope.
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#6
11-18-2005, 03:37 PM
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Re: high idle
My passenger side manifold leaks a bit but ive put off dealing with it until i do plugs and remove the smog junk. I dont think the leak it that bad but i can certainly hear it.
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92 z28 camaro 5.7 TPI current - slp intake runners and base-BBK 52mm throttle body-MSD 8.5mm wires, blaster coil, and 6AL Box-edelbrock headers-160 degree stat.-hotchkis strut tower brace waiting in the garage - LQ4, milled heads 317 casting (10.5 to 1), hardened pushrods, ported LS6 oil pump, manley dual spings with titanium retainers, MTI X1 cam, hawks longtube headers
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#8
11-18-2005, 03:44 PM
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Re: high idle
My car was really loud (in a bad way) when i had that leak, and on demand performance was not there at all. My leak was really bad. If you couldn't notice, something must be wrong with you nostrils. The back half of the driver's side cylinder head was covered in sut. But i agree with what wrightz28 said, looks like you gotta a vaccy leak somewhere.
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87 IROC - R.I.P, and she will never be forgotten 90 RS - The beginning of a new era... I hope.
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#9
11-18-2005, 04:03 PM
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Re: high idle
I agree with most that it is vacuum related. However, instead of a constant leak and assuming this is a carburated system, check the throttle dashpot. This is a device which prevents your throttle to slam shut when you lift you feet of the gas pedal. It is vacuum activated. The vacuum is released slowly and allows the throttle to ease shut. It could be that the vacuum is not being released and thus causing the throttle to remain slightly open. When you shut your engine down, you lose all you vacuum and so the dashpot collapses until you start up your car and build up vacuum again.
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#10
11-18-2005, 04:21 PM
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Re: Re: high idle
Quote:
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Formerly Blownalcoholboy 1986 Z28, 400ci SBC, Twin borg warner billet S467 turbos, Reid case powerglide, Moser 9". Holley EFI, Boost Leash. 950RWHP on pump gas, 1200rwhp on race gas (22 psi) Best ET 1/4: 8.35 @ 170mph (275 drag radial) Best ET 1/8: 5.44 @ 132mph (275 drag radial) Best 60': 1.31 on the back tires (275 drag radial) AF User Rules/Guidelines http://www.automotiveforums.com/vbul...uidelines.html
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#11
11-18-2005, 06:26 PM
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Re: high idle
tpi injection is what i have. How could it be a vacuum leak if i can push the throttle bracket against the idle screw and then the idle goes to normal.
__________________
92 z28 camaro 5.7 TPI current - slp intake runners and base-BBK 52mm throttle body-MSD 8.5mm wires, blaster coil, and 6AL Box-edelbrock headers-160 degree stat.-hotchkis strut tower brace waiting in the garage - LQ4, milled heads 317 casting (10.5 to 1), hardened pushrods, ported LS6 oil pump, manley dual spings with titanium retainers, MTI X1 cam, hawks longtube headers
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#12
11-18-2005, 06:32 PM
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Re: high idle
stcky throttle blades/cable?
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97 Camaro - 2.077 60', 14.745 @ 92.20 - still down, one year later. 194k miles-160* thermo-V8 shocks/springs (V6 rear springs)-3" Magnaflow !cat (3" dynomax bullet) back-SLP CAI-stock boxed LCAs-poly tranny mount and torque arm bushing-custom HPTuners tuning-4.10s/eaton/TA girdle-3.5" alum DS-spohn LCA brackets-prostar skinnies 179.75 RWHP, 204.52 RWTQ ON ITS WAY: MORE R.I.P. Andy 87 Benz 190e - DD 01 EX250 - still gotta get my license for this thing
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#13
11-18-2005, 11:32 PM
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Re: high idle
Its gotta be somethin like that. Ill just clean it up best i can with some throttle cleaner and see what I come up with.
__________________
92 z28 camaro 5.7 TPI current - slp intake runners and base-BBK 52mm throttle body-MSD 8.5mm wires, blaster coil, and 6AL Box-edelbrock headers-160 degree stat.-hotchkis strut tower brace waiting in the garage - LQ4, milled heads 317 casting (10.5 to 1), hardened pushrods, ported LS6 oil pump, manley dual spings with titanium retainers, MTI X1 cam, hawks longtube headers
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