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#1
01-30-2009, 03:38 PM
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Sonoma high idle while driving
Okay now I’m stumped. The compressor is disconnected. Now the engine wants to idle at 2000rpm while in drive or park. Sometimes when not using the heater(off position) the engine runs as it should. Most of the time it idles way to high. Even while driving. Makes coming to a stop on snow covered roads interesting. Almost took out a neighbors garage door. The check engine light is not coming on. So I assume there are no codes to check. We are experiencing a very cold icy winter here in Ohio. Driving is an experience without the truck idling too high on slick roads.
Any ideas?  2000 GMC Noma 
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#2
01-30-2009, 03:45 PM
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Re: Sonoma high idle while driving
While it is idling high- pop hood- listen for vacuum leak- either a hose unhooked, or an intake plenum gasket leak- also it could be a stuck open IAC (Idle Air Control) pintel- What yr truck and what engine?
__________________
Automotive A/C Engineer with: '99 IH 4700 Toy Hauler (2) '95 GEO Prizms both maroon '99 GMC Yukon '95 Chev 3500, 454 Dually Crew Cab- 145k miles- Wife's Camel trailer puller. '94 Astro- 370k miles '94 Firebird Formula- 5.7L 180k miles- gone- '92 Chevy Lumina Van 3.8L 264k '86 GMC S-15 - 2.8L 154k '87 Buick Park Ave . 187k '86 Buick Park Ave 3.8L 199k miles- gone '77 Chevy Vega- 2.5L 175k miles gone but not forgotten '68 Camaro 396 4 spd RS/SS -72k miles-
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#3
02-05-2009, 02:13 PM
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Re: Sonoma high idle while driving
2000 Sonoma
4.3 engine
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