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Old 09-19-2013, 06:33 PM   #1
czo79
Scooby Newbie
 
Member#: 6752
Join Date: May 2001
Location: Montpelier, VT, USA
Default Seafoam in intake (97 OBS)

Hey folks,
still trying to figure out why my impreza is always idling high. It's a 97 outback sport. EJ22. I'm hoping to avoid pulling and cleaning the IAC valve. It sounds like some people have had luck with seafoam. The shop near me has the regular seafoam liquid and a seafoam in a spray can. I'm wondering if anyone can tell me exactly how to go about seafoaming the intake side of the engine. Exactly where do I spray (I'm assuming I should use the spray) the seafoam to clean the IAC? It sounds like the turbo guys do it on the vacuum line to the BOV. Some people use the vacuum line to the brake booster? Does that sound right? thanks!
Czo
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Old 09-19-2013, 06:58 PM   #2
cal_look_zero
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Member#: 294461
Join Date: Sep 2011
Chapter/Region: NWIC
Location: Grass Pants, OR
Vehicle:
1997 Outback Sport
344hp/348tq

Default

Your best bet is to do it through the PCV line. It's the closest vacuum to center on the non turbo cars.

As far as the IACV, I always clean them with gasoline and q tips.
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Old 09-19-2013, 08:25 PM   #3
RaceFaceXC
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Member#: 165749
Join Date: Dec 2007
Chapter/Region: South East
Location: stupid Florida
Vehicle:
2007 No YELLING
on the bus!

Default

If you use the spray you can direct it right into the intake anywhere after the MAF sensor. If you don't have an MAF based system then anywhere after the air filter. The only downside is that some if it will get stuck in the air box just before the throttle body. The best is to go right in the throttle body if you don't mind pulling of the intake assembly connected to it.

If you use the non pressurized can of sea foam liquid, any line that goes to the intake after the throttle body will technically work, however, if that line connects to the intake manifold anywhere except the center plenum it may not get into all the combustion chambers equally or at all.

I would expect that cleaning combustion chambers and associated parts with sea foam will not lower your idle speed.

If you can hook up a scan gauge, check the coolant temp when warm to be sure it's accurate. A faulty sensor giving the ecu an artificially low coolant temp signal will cause a higher isle speed and rich mixture. The IACV could probably benefit from a good cleaning and reseal if it's been several years since it was last done. Besides, it's cheap and relatively easy to do.
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Old 09-24-2013, 09:36 PM   #4
schrek1991
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Member#: 319606
Join Date: May 2012
Location: O town UT
Vehicle:
01 Outback
Burgandy, Ron

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Anyone know if this is bad for o2 sensors?
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