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10-09-2015, 04:40 PM
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#1 |
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Registered User
Join Date: Aug 2015
Location: Santa Fe, Texas
Posts: 6
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1987 SWB 4x4 Idling Super High
Building a truck for my son. I'm slowly but surely knocking out one problem after another thanks to all the help here on this forum. Getting real close to getting it finished up. The issue now is that it is idling super high. Any ideas as to why this might be and where to start looking.
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10-09-2015, 07:59 PM
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#2 |
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Registered User
Join Date: Jun 2003
Location: ga
Posts: 630
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Re: 1987 SWB 4x4 Idling Super High
maybe a VACUM LEAK I would check all the vacuum hoses first
__________________
4x4k30 if trouble was money i would have plenty |
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10-10-2015, 10:15 PM
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#3 |
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Registered User
Join Date: Dec 2006
Location: SLC, UT
Posts: 706
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Re: 1987 SWB 4x4 Idling Super High
Vacuum leak is the first thing I would look for.
Then I would check the IAC and the CTS. |
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10-10-2015, 10:43 PM
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#4 |
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Senior Member
 
Join Date: Nov 2008
Location: Gresham , Oregon
Posts: 588
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Re: 1987 SWB 4x4 Idling Super High
I'm having the same problems on my 1984 GMC .. I've checked for vacuum leaks ... Found nothing ...
Question now ... what is IAC and the CTS. Where are they located ??? Pictures ??? Thanks !! 
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10-11-2015, 01:29 AM
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#5 |
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Senior Member
Join Date: May 2004
Location: Caldwell,Tx.
Posts: 3,648
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Re: 1987 SWB 4x4 Idling Super High
We use carb cleaner to check for leaks. Spray it around the base of the throttle body and all vacuum connections. If the idle drops you found the leak. It could also be a bad brake booster leaking internally. If you hear it from inside the cab you know it is a bad booster. Fuel injected engines will just add fuel if they get extra air and will present as a high idle.
Frank
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Born and proudly residing in a Red State ! |
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