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02-02-2006, 08:35 PM | #1 |
Scooby Specialist
Member#: 58967
Join Date: Apr 2004
Chapter/Region:
Tri-State
Location: New Milford, CT
Vehicle:2002 WRX Silver |
Hanging RPMs when cold, IAC or TPS?
I have an '02 Forester and when the car is first started in the morning it idles at about 1500 RPM for a short amount of time then when driving the RPMs hang at 3k or so until the engine heats up. Could this be a dirty IAC or a TP sensor?
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02-02-2006, 09:13 PM | #2 |
Scooby Specialist
Member#: 68340
Join Date: Aug 2004
Location: Mill Creek, WA
Vehicle:2006 WRX SMG |
that sounds normal, ur tranny (if AT) will not shift into overdrive until it heats up to normal temps
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02-03-2006, 07:43 AM | #3 |
Scooby Specialist
Member#: 58967
Join Date: Apr 2004
Chapter/Region:
Tri-State
Location: New Milford, CT
Vehicle:2002 WRX Silver |
I'm sorry, the car has a manual transmission
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02-03-2006, 02:12 PM | #4 |
RIP 10/12/83 to 02/10/08
Scooby Specialist Member#: 83254
Join Date: Mar 2005
Chapter/Region:
NWIC
Location: Roy, Washington
Vehicle:98 2.5 RS 04 WRX |
This is normal on my 98. When the Engine is really cold it doesn't turn off the fuel on engine decel, this causes the rpms to hang for a bit.
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02-03-2006, 02:40 PM | #5 |
Scooby Guru
Member#: 44501
Join Date: Oct 2003
Chapter/Region:
NWIC
Location: Yeah, well, you know
Vehicle:that 's, like, your alternate facts, man. |
It's the IAC compensating for the rich condition used for cold starts. Due to emissions regulations, the IAC opens a little to make sure the extra fuel burns off... otherwise the car would be putting raw hydrocarbons into the exhaust.
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02-03-2006, 06:28 PM | #6 |
Scooby Specialist
Member#: 58967
Join Date: Apr 2004
Chapter/Region:
Tri-State
Location: New Milford, CT
Vehicle:2002 WRX Silver |
So this is normal? I don't remember the car doing it the entire time we have owned it, just the last year or so(I suck at working on cars when it isn't modding them)
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