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Old 01-16-2005, 11:44 AM   #1
Dangerdave
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Question Legacy Vaccum Leak

Hey Everybody,

My younger sister has a high km 93 legacy turbo ej22t. She recently replaced the timing belt and not long after had to replace the car's computer. The car is still running very rough. The shop we both take our cars to has said they think its a vaccum leak. We were going to replace a leaking 02 sensor today and I was hoping to see if I could locate it. I've owned a couple subarus neither of which were turbo, so i'm not sure where to start. Any advice on common places where a leak may develop on these engines would be very helpful. Thank you very much
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Old 01-16-2005, 09:16 PM   #2
00Maddog
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your o2 is leaking??
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Old 01-17-2005, 01:49 AM   #3
ncarn8
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Does it have a boost guage? connecting one might be able to tell you if it has a serious leak. When its idling, pull the idle control valve plug out breifly. If idle stumbles and gets rougher, theres the roblem. Its on the intake manifold, near the back next to the t/b on the opposite side of the intake. (Dunno if its different for US cars)
Check all the tubing from the airbox back. Check the turbos inlet pipes and Intercooler(if it has one) inlet. then check the t/body both sides. Check plugs. Check AFM. Turn it on and listen closely you may be able to hear it. (unlikely). Colour of plugs should tell you whats going on.
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Old 01-17-2005, 09:44 AM   #4
subysouth
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Quote:
Originally Posted by 00Maddog
your o2 is leaking??
I second this question.

ss
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Old 01-17-2005, 09:35 PM   #5
vrg3
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If a vacuum leak is big enough to cause a rough idle, you can usually find it with some starting fluid (the aerosol can you buy at the auto parts store, not the barbecue stuff). Run the engine at a warm idle and spray it anywhere you think there might be a leak. Use quick half-second bursts and wait a few seconds in between to let the fluid evaporate.

If you spray where there's a leak, the engine will ingest the fluid and the fluid will also kind of seal the leak. It will affect the idle speed. You'll hear it.
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Old 01-17-2005, 11:41 PM   #6
ncarn8
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this trick also works with lubricatns like RP07, CRC etc.
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Old 01-17-2005, 11:54 PM   #7
00Maddog
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another easy way to look for vacuum leaks is to blow cigerette smoke into the brake booster nipple on the manifold. the smoke will come out of the leak, can be seen with a mag-lite pretty easily.
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Old 01-18-2005, 12:15 AM   #8
vrg3
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ncarn8 - Yeah, almost any aerosol would do. Starting fluid just evaporates fast.

00Maddog - I presume you mean when the engine's not running, right?
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Old 01-18-2005, 02:40 PM   #9
Dangerdave
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Thumbs up

hey thanks for all the replies.

Maddog and Scoobysouth, sorry for sounding so vauge. There's oil leaking out from around the 02 sensor. I'm going to my sisters place in a couple of days and I'll try the things suggested and let everyone know how I made out. As far as plug colour, what should I look for? I know what different plug conditions typically indicate, but not specific to this problem. Thanks again for the help and advice


Dave
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Old 01-18-2005, 09:51 PM   #10
00Maddog
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the oil leaking around your o2 sensor is a leak running back. on a 2.2t check the cam-plug o-ring on the rear of the cylinder head turbo side. There are obviously a lot more sources for oil in that area, but that is an extremely common one. Prob not related to the rough run, did that start immediately after the t-belt was replaced?

Jerry
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