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Old 05-10-2004, 12:47 PM   #1
Scooby Newbie
Member#: 13742
Join Date: Dec 2001
Location: Los Angeles -- was Santa Cruz
2002 Impreza WRX
WR Blue

Question hoses installed low idle possable air leak need help

Yes I've searched. But if you know what's going on please let me know.

So I install a bunch of aftermarket hoses and now have two minor issues.
First I installed Samco MAF, tubro Inlet, radiator, and Intercooler hoses. -- I also installed a new air filter, changed the radiator fluid, and oil, and oil filter.

The other mods on my car are Up-pipe, turbo back exhaust with one hi-flow cat, intake silencer removed. -- I've had no issues with these previous mods and they have been on the car for quite some time.

Now the issues I have, one a low / rough idle. It is around 500-600rpm I've read that I can try and spray carb cleaner on the MAF sensor and this may clear up the issue. If there are any other suggestions or if it's perhaps just due to the new hoses I'd like to know.

Second I have what sounds like an air leak -- easily possible, or what sounds like rushing / whistling air. However I can not locate or see where it could be. I can not feel it anywhere I can only hear it. It is not hard to hear when your over the engine bay, but you don't really hear it unless the hood is popped open.

Now it seems like the air noise is coming from roughly the area of the green ellipse in the picture below (not my actual car) or from the valve purge that the arrow is pointing to. That is it sounds like it could be air flow THROUGH the valve purge. However if I move the hoses around, just kinda pushing or pulling or bending them a little to see if I can hear the air flow sound any different it does nothing. I've done this all over the engine bay, no difference in sound. Could I have pushed apart the hoses under the intake manifold, when installing the turbo inlet pipe? Is there something there that could cause my idle to be low? Is the air flow sound through the valve purge something that's normal? Anyone got suggestions to try or a reason for what's going on?

Couple other things.. the car was left with all the stock hoses off for 4 days -- in an underground parking spot which should be fairly dry, however perhaps some condensation built up on the MAF sensor or something? -- perhaps causing the low idle?

Second when I refilled the radiator I was a dumb a** and only added ONE gallon of 50/50 blend, thinking I only needed one gallon of raditor fluid, and not realizing that works out to two gallons when mixed. -- So I did mix it first and then added only one gallon to begin with. So I drove it down the street, hit the boost once.. noticed my temp gauge climb super high.. drove back home (total distance about 0.3 miles -- just up and down the block) and then added more fluid til I realized my mistake and that I needed a whole gallon more, which I added. So I don't think I did any damage, however I'm no expert, I'm still learning so that's why I'm asking.

Other than that all the hoses I put back on are tight, clamps are tight, no air is leaking out of the new hoses or the hoses that connected to them as I've tested all those connections, pinching the hoses, pushing them around, NOTHING I do changes the air flow sound. So I'm not sure what it is? Any help is greatly appreciated.

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Old 05-13-2004, 02:01 AM   #2
Scooby Newbie
Member#: 13742
Join Date: Dec 2001
Location: Los Angeles -- was Santa Cruz
2002 Impreza WRX
WR Blue

Default anyone

anybody? any thoughts?
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Old 05-13-2004, 05:30 AM   #3
Scooby Specialist
Member#: 23630
Join Date: Aug 2002
Chapter/Region: NWIC
97 v4 STi RA
Feather White, 02 WRX MBP


Did you remove the manifold when you did your induction hose?
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Old 05-13-2004, 09:41 AM   #4
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Member#: 14873
Join Date: Jan 2002
Location: Dayton, OH
2002 WRX Wagon


Finding gremlins sucks. Try spraying a little water where the air leak may be. You'll hear a change in the idle for a second when you find it.

If nothing else, redo everything you already did. Inspect the hoses to make sure there isn't something wrong with them. I don't know specifically about Subies, but rough idle is a symptom of, guess what, a vacuum leak.
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Old 05-13-2004, 11:25 AM   #5
Scooby Specialist
Member#: 5477
Join Date: Apr 2001
Chapter/Region: MWSOC
Location: in the garage!
2007 R171.473
2009 SWP Spec B


I am going to venture a guess here that it is the "T" fitting on the emmissions control system.

In your picture you have that area circled. If you take a flashlight and look around in there under the manifold you will see a blue "T" connector. This has been an issue in the past with many people having the hoses come loose from there.

Hope that helps

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