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  #1  
Old 03-25-2008, 06:43 PM
 
Join Date: Feb 2007
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Default High RPM at cold idle

My car when cold idles at 2500 rpm then steadily drops to normal as the temp warms up. I dont really think anything of it as far as being an issue, but I'm wondering why it does this?

I have an AFC NEOhooked up since I bought it, I know how to use itand all but does itmake thecar idle high to warm it up or does it do this becauseit is setting? Or am I totally wrong?
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  #2  
Old 03-25-2008, 07:53 PM
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Default RE: High RPM at cold idle

there is a valve in a car that makes them run at a high idle when ata cold start. Its called the Fast Idle Air Valve (FIAV). What it does is have the engine rev higher during a cold start to warm it up faster. Perfectly normal
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  #3  
Old 03-25-2008, 09:17 PM
 
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Default RE: High RPM at cold idle

thx ^^^
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  #4  
Old 03-25-2008, 09:41 PM
 
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Default RE: High RPM at cold idle

2500 sounds high tho doesnt it? mine goes to 1500-1600 but not up that high. if te says its normal i would listen to him
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  #5  
Old 03-26-2008, 06:30 AM
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Default RE: High RPM at cold idle

I wouldn't say that 2500 is normal, but then again, it may be normal to your fuel settings. If you have a lot of fuel running through the injectors, then yes, it's normal. If you have your fuel settings close to stock, then no, it's a high idle.
What RPM does your car idle when it's warm? Auto or standard? Is your narrowband O2 sensor good or is it old and caked up? Is your TB area clean? Do you have any air leaks? How long does your car take to lower its RPMs?
When I had my FIAV and ISC during the winter in Missouri, my car idled cold at or around Atown's numbers. As my original ISC and FIAV started to go bad, my idle jumped to 2k....in Hawaii! My idle went to 800-900 after removing the EGR, FIAV, vacuum lines, and ISC and has stayed there since. I'm not suggesting removing anything, just check for the normal turbo car items.
As you may know, DSMs are just funny that way sometimes, so you make the call.
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Old 03-27-2008, 09:52 AM
 
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Default RE: High RPM at cold idle

Quote:
ORIGINAL: silvercoupe97

I wouldn't say that 2500 is normal, but then again, it may be normal to your fuel settings. If you have a lot of fuel running through the injectors, then yes, it's normal. If you have your fuel settings close to stock, then no, it's a high idle.
What RPM does your car idle when it's warm? Auto or standard? Is your narrowband O2 sensor good or is it old and caked up? Is your TB area clean? Do you have any air leaks? How long does your car take to lower its RPMs?
When I had my FIAV and ISC during the winter in Missouri, my car idled cold at or around Atown's numbers. As my original ISC and FIAV started to go bad, my idle jumped to 2k....in Hawaii! My idle went to 800-900 after removing the EGR, FIAV, vacuum lines, and ISC and has stayed there since. I'm not suggesting removing anything, just check for the normal turbo car items.
As you may know, DSMs are just funny that way sometimes, so you make the call.
when warm I'm at 750-800. It takes on a real cold day 5 min tops to get down to normal. TB area is clean and no air leaks. I have to check the o2 sensor but my guess would be that itspretty old. Occasionally the idle will surgeand jump from2000-2500 and slowly drop down to 750 when it warms up after a few min.
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3" straight exhaust
Greddy Type RS BOV
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  #7  
Old 03-28-2008, 03:46 AM
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Default RE: High RPM at cold idle

Do a boost leak check and ohm out your ISC and your TPS (throttle position sensor). It sounds to to me like it's in the TB area since you stated that it may surge. You most likely have an air leak and the ISC is trying to compensate for it, but since it has its limits, it cannot.
You also cannot tell whether or not you have an air leak just by looking. Remember there is a lot of pressure in those intercooler pipes and at any time, a leak may and will occur without you knowing. The only surefire way to tell is by doing a boost leak check and dousing the pipes and intake manifold with soapy water.
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Old 03-28-2008, 03:46 AM
 
 
 
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95, air, car, cold, eclipse, fast, fiav, high, idle, leak, mitsubishi, rpm, rpms, tb, valve, winter


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