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Old 01-25-2006, 08:53 AM   #1
chris84bond
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Default Retarded Throttle Position Sensor Question

My engine is racing when it is first started and for the first...5 mins or so of driving. Had it checked out, friend said it was the TPS that needed adjustement. Is there a way to DIY that is easy, or would it be easiest to take it to someone, and who would that be. Subaru probably?

Or....

Should I just buy a new one...would that correct the problem?

Thanks

-Chris

93 Impreza L
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Old 01-25-2006, 03:30 PM   #2
Master2192
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You should be able to do it yourself. But I'm more inclined to say its your IACV instead of the TPS. If it was the TPS you should notice the affects at all times, not just when its cold.
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Old 01-25-2006, 08:14 PM   #3
chris84bond
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Quote:
Originally Posted by Master2192
You should be able to do it yourself. But I'm more inclined to say its your IACV instead of the TPS. If it was the TPS you should notice the affects at all times, not just when its cold.
IACV=?
Idle air control valve...gotcha
It's more when it's cold than not....higher rpm(idle at 1.5k instead of 1 and under) and it slips a little. I know about 3 months ago, the IACV was completely carboned over..car wouldn't even start. Carb cleaner==temp fix. Was hoping I wouldn't have to shell out the money for a new one...

Damn
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Old 01-25-2006, 09:43 PM   #4
phantomsr
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If the IACV is gunked up already you may want to take a peak at your intercooler. Oily? Blow by on the rings or valve seals could be your culprit. A catch can will mask the issue somewhat until you can find the real issue.
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Old 01-26-2006, 12:12 AM   #5
cdvma
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Idle at 1.5k isn't that uncomon in cold weather...heh...but you are talking Florida cold and I'm talking "its warm when its 25* out".

IACV. Buy another gasket, take yours off and clean it.
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Old 01-26-2006, 12:37 PM   #6
chris84bond
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Quote:
Originally Posted by phantomsr
If the IACV is gunked up already you may want to take a peak at your intercooler. Oily? Blow by on the rings or valve seals could be your culprit. A catch can will mask the issue somewhat until you can find the real issue.
No intercooler...It's only a 1.8L stock right now...
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Old 01-26-2006, 12:39 PM   #7
chris84bond
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Quote:
Originally Posted by cdvma
Idle at 1.5k isn't that uncomon in cold weather...heh...but you are talking Florida cold and I'm talking "its warm when its 25* out".

IACV. Buy another gasket, take yours off and clean it.
The idle only stays that high for about 5 mins of driving, then drops. Sometimes, the tranny goese slip slip tho, and the tranny is good from what everyone's been saying. Could that be the IACV as well doing that?

Thanks

-Chris
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Old 01-26-2006, 12:56 PM   #8
jmussetter
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Everything that you're describing sounds normal for a car when it is first started.

The IACV lets more air into the Throttle body when the engine is cold so that it will stay running while it warms up. As the coolant in the engine warms up, it is circulated to the T.B. and the IACV reacts to this by closing it's valve so that the extra air doesn't come in anymore. And Whala! The car is back to it's normal idle RPM after this. I live in California and exp. the same thing that you're describing, even in this climate.

The clutch is also cold, and like brakes, need to warm up before they get "sticky" enough to grab and hold power the best. The tranny heat's up 1 of 2 ways, 1-by friction inside, and 2-radiated heat from the engine. While the engine warms up, so does the tranny, and clutch that is connected between.

-jason
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Old 01-26-2006, 04:45 PM   #9
chris84bond
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Quote:
Originally Posted by jmussetter
Everything that you're describing sounds normal for a car when it is first started.

The IACV lets more air into the Throttle body when the engine is cold so that it will stay running while it warms up. As the coolant in the engine warms up, it is circulated to the T.B. and the IACV reacts to this by closing it's valve so that the extra air doesn't come in anymore. And Whala! The car is back to it's normal idle RPM after this. I live in California and exp. the same thing that you're describing, even in this climate.

The clutch is also cold, and like brakes, need to warm up before they get "sticky" enough to grab and hold power the best. The tranny heat's up 1 of 2 ways, 1-by friction inside, and 2-radiated heat from the engine. While the engine warms up, so does the tranny, and clutch that is connected between.

-jason
I would agree and say that this is normal, but it didn't do this before...or in the past 3 years I've owned the car in the cold...
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