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Old 08-31-2009, 09:34 PM   #1
SausageCat
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Default Hot weather vs Warm Weather vs Cold Weather - RPM issue.

Just got my 05WRX back from short block swap after spun bearing issue. The Engine appears to run smooth and strong. I have one issue thou.

When I start the engine on a cold engine the rpm goes to about 1500 then slowly goes down to 500 - 600. I can speed up the process by sharply pressing on the gas pedal... and right after that the rpm goes to 500-600 range (Warm weather, Cold Engine). But, as soon as the weather gets hot - I have an rpm freak-out. The startup is still fine but then when I'm driving sometimes the rpm doesn't go down below 1500 - 2000rpm when the gear is disengaged and the car is in full stop (red light, no foot on gas)... I can sharply kick the gas pedal and right after the rpm settles again around 500-600 rpm. This only happens when its hot outside. When I'm driving at night (Cold weather) the rpm's are fine all the time.

Any idea what it could be? Again, I just had the short block swapped.
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Last edited by SausageCat; 08-31-2009 at 10:19 PM.
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Old 08-31-2009, 11:00 PM   #2
Hawkeye_Chaw07
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2007 Wrx
Aspen White

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Do you pull a CEL? If so, it might be your IACV.

Also, check the tightness of your throttle cable/cruise control cable.

My car has the same problem in hot weather stop and go traffic, eventually I found wire showing on the harness into the IACV.
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Old 09-01-2009, 01:23 AM   #3
SausageCat
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No CEL, the IACV looks clean from outside. Car is all stock and has only 30.000km. I'll check the wires next...
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Old 09-01-2009, 01:55 AM   #4
toconn
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Silver

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This sounds completely normal to me?

A high idle is normal while the engine is warming up in a cold-weather start.

Your A/C is probably on in the hot weather (if you have the "AC" button off but the car set to one of the defrost-vent settings, your A/C will still cycle).
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Old 09-01-2009, 09:28 AM   #5
SausageCat
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That I know, Im talking hot weather + hot engine = 1500 - 2000 RPM periodically. The A/C and vent system is off. Open windows instead


Quote:
Originally Posted by toconn View Post

A high idle is normal while the engine is warming up in a cold-weather start.

Your A/C is probably on in the hot weather (if you have the "AC" button off but the car set to one of the defrost-vent settings, your A/C will still cycle).
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Old 09-01-2009, 02:15 PM   #6
phishninmn
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i have the same problem it sucks
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Old 09-01-2009, 03:20 PM   #7
windozer
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San Remo Red

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You should try loosening the cruise control cable. Sometimes when it's really warm out and the engine gets nice and toasty that wire can snag and such. I only have the problem sitting in stop and go traffic for 15+ minutes.
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Old 09-01-2009, 08:51 PM   #8
van_dutch
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The high idle in the heat is most likely due to the cruise control cable as was mentioned. There is a bracket that warps as it heats up (sitting in traffic, a particularly hot day, etc). It then pulls on the cruise control cable, forcing the idle. Adding some slack to the cruise control cable can help. Try searching for "high idle" and "cruise control cable" to get more details.
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