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Old August 18th, 2009, 08:03 PM   #1
Mall Wheeler
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Default 87 chevy pickup fast Idle problems

I have an 87 chevy pickup that is fuel injected, 4x4 auto, 350, the truck has a fast idle. does anyone know how to fix this , I was thinking about taking the fuel injection off and switching to a carb, but if it is an easy fix I would like to keep it. I have checked vacum lines and also have sprayed carb cleaner around the base and still not change......
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Old August 18th, 2009, 08:54 PM   #2
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This just start, or has it been coming on gradual? I was thinking the TBI base gasket was cracked or sucked in. Is the vacuum ball good? Do you hear any kind of sucking from under the dash? The heater controls use vacuum for mode changes usually.
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Old August 18th, 2009, 09:17 PM   #3
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Sounds like the idle control valve on the side of the throttle body, $30.00 part.
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Old August 19th, 2009, 06:26 PM   #4
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just changed gasket and throttle control valve and still the same,
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Old August 19th, 2009, 10:07 PM   #5
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checked ignition timing? i've seen the hold downs loosen and cause the distributor to move around.
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Old August 19th, 2009, 10:27 PM   #6
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Quote:
Originally Posted by tguenthardt View Post
just changed gasket and throttle control valve and still the same,
Throttle control valve or "idle" control valve?
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Old August 19th, 2009, 10:28 PM   #7
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Quote:
Originally Posted by Kodiak450r View Post
checked ignition timing? i've seen the hold downs loosen and cause the distributor to move around.
I've had a hold down break off at the tabs, what the f---!!!
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Old August 20th, 2009, 05:15 AM   #8
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I thought I was changing the idle valve but in a not so bright moment I changed the throttle valve, so I will change the idle now. Check the hold down and it is tight. Thanks for the reply's I will let know know if this work in a day or so.
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