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Old 08-06-2003, 12:18 AM   #1
Stickee
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Unhappy Removed 2nd air filter - downhill from there...

So I was having hesitation problems at low RPMs, anywhere from 1000 - 2000 RPMs. I decided to take out the 2nd air filter, as many people have done before, to see if it would help any. This was a big mistake. I put everything back together and start her up. The car starts, and then dies out. Tried this several times, and got the same thing.

I had to get going so decide to just put the filter back, and check on documented procedure for removing this filter. Well, the filter doesn't go in properly, and me and my dad have a hard time putting everything back together properly.

We finally do so, the engine starts, stays on, but now the idle is very rough. It wouldn't die as before, but the RPMs would go very very low, and bounce around.

First question, does anyone know how to adjust the idle? Would it help to just adjust the idle so that it is around 900 RPM?

I then had to drive to drop something off at my girlfriend's house. As I stop at the bank machine, I notice that the idle is now smooth, at around 700 RPM. It seems to have settled down. When I get to her house, I notice that the RPM remains steady at idle. Is it okay now?

CEL is now on, and I'll do a reset tomorrow night after work.

Can anyone diagonse this problem?

TIA



P.S. I'm driving to Pennsylvania on Friday, and I hope everything will be alright....
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Old 08-06-2003, 01:44 AM   #2
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I've never HAD a filter in the second box (torque box by throttle body). You're sure that the first airbox HAS its filter in place? How about an ECU reset after removing the second filter?
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Old 08-06-2003, 01:58 AM   #3
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Dude - you need some sort of bracket in the 2nd airbox - without the filter, the airbox is not sealed, so it's basically like a huge vaccum leak. Not good.

You *could* try cutting out the filter material, but leaving a little piece in the middle to support the gasket. Try this at your own risk of course, cauz this is all speculation by me.

LaterZ!
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Old 08-06-2003, 05:34 AM   #4
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Sounds like you have disconnected one of the vacuum hoses... Check them out.

D.
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Old 08-06-2003, 05:47 AM   #5
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Quote:
Originally posted by Penphoe
Dude - you need some sort of bracket in the 2nd airbox - without the filter, the airbox is not sealed, so it's basically like a huge vaccum leak. Not good.

You *could* try cutting out the filter material, but leaving a little piece in the middle to support the gasket.....
Darren!!
What he said, you have a vac leak if there isn't a gasket or other type of seal in the box .
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Old 08-06-2003, 09:17 AM   #6
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Okay, I put the filter back, and after the initial "rough idle," everything seems back to normal.

Guess it was dumb of me to think I could just take out the 2nd filter... I shoulda known it wouldn't seal properly.

I highly doubt this, but do you guys think I've done any permanent damage? Everything seems okay, except for the CEL, which I will be resetting after work.

Thanks for all yer help!
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Old 08-06-2003, 01:27 PM   #7
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Not unless there was something that could have been sucked into the engine when the 2nd gasket was missing. You should be okay.

If you're into dumpster diving, try to find another Impreza with a similar intake/filter setup at a junk yard. Grab the filter out from that thing and then hack it up like I described above. Another thing you can try is to find the intake plumbing off of a MY98 - I believe they're differen than the MY99's. It's got a box, but no filter up there. Should be able ot get things to match up.

Hope that helps!

LaterZ!
Darren!!
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Old 08-06-2003, 03:31 PM   #8
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I kinda almost did the same thing in my 99 2.5 RS coupe.
I removed the upper air filter, started the car, it stalled. Started, it stalled. I figures like they said, neded a gasket.

I spent 30 min cutting apart the air filter to get the gasket out, then using RTV and the gasket I put the upper box together.
24 hours later I took it for a quick ride. Got a rough idle once I went around the block.
Opened the top airbox, found with no support the rubber had seperated and created a vacuum leak again.
Then took the other car to the dealer, they had no idea about a gasket kit to put in there, so for $17 later I got an upper airfilter.

2 days later went to F&S Scoobie junkyard and bought the gasket from a rolled forrester.
That's in the car now.
I paid $40 for the gasket and a rear STB.
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Old 08-06-2003, 05:04 PM   #9
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I have a home made CAI. It only uses one filter I think. There's no filter on the end of the pipe, just in the stock airbox. Is this right?
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Old 08-06-2003, 05:25 PM   #10
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Quote:
Originally posted by mprezuhguy
I have a home made CAI. It only uses one filter I think. There's no filter on the end of the pipe, just in the stock airbox. Is this right?
You should have a cone filter on the end of the pipe and a gasket in the airbox. For my airbox I used thick foam weather strip and 3M spray adhesive to make the foam double-sided. Works fine, if everything is perfectly clean before putting it together.

My experience is the air box with custom pipe or Larry's intake pipe improves low end torque with a scarifice in high end.

J-bend tubes like the Weapon-R have a sacrifice in low end torque, but can breathe and rev up to redline. Using a PRM inline filter (what COBB uses) and extending the WR to the fender hole with ABS pipe for cold air is the best I can come up with without spending $300. I like J-tubes.
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Old 08-06-2003, 07:51 PM   #11
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Does JBweld Melt plastic? If not I think that'd be a great way to seal the air box. Easy, and if you do it right it's permanent and clean.
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Old 08-06-2003, 08:17 PM   #12
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JB, silacone or epoxy will bond, epoxy is probably cheaper.

Without some foam or somthing in there, the box has lost some tolerance and the 3 clasps will be loose. But if you glue it shut, I guess you can remove the clasps.
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Old 08-07-2003, 12:58 AM   #13
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Quote:
Originally posted by mprezuhguy
Does JBweld Melt plastic? If not I think that'd be a great way to seal the air box. Easy, and if you do it right it's permanent and clean.

I dont know, but I used JBweld on my Airbox when I did the 3" airbox mod (removed the 2.5" elbow and put a 3" rubber elbow there)
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Old 08-07-2003, 01:38 PM   #14
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Yeah, so I think JB weld would be the way to go. MUCH easier than trying to cut a gasket out of your old filter.
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Old 08-07-2003, 01:52 PM   #15
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Just get the gasket . FYI, the gasket is rather thick and rigid plastic... not the typical rubber gasket you're thinking of. Getting the upper box back together with the gasket is a PITA but doable (its not designed to be opened if there is no filter in there). Make sure you reset the ECU after you get it right (my advice is to unplug the battery before you start the procedure). Check out www.fandsauto.com and www.octagonauto.com they are Subaru junk yards. Any non-California or early 99 cal-spec Impreza, Forrester, or Legacy will have the same 2nd airbox and gasket.


edited link for Octagon Spares

Last edited by BOY; 08-07-2003 at 02:08 PM.
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Old 08-07-2003, 02:01 PM   #16
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The web address for Octagon Spares is http://www.octagonauto.com/
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Old 08-07-2003, 02:03 PM   #17
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Why not just stick it together? Is this bad or something? Seems like it'd be easier to go to wal-mart and get a tube of JB than order a gasket from a junkyard. Just wondering if there's something I missed.
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Old 08-07-2003, 02:10 PM   #18
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Quote:
Originally posted by mprezuhguy
Why not just stick it together? Is this bad or something? Seems like it'd be easier to go to wal-mart and get a tube of JB than order a gasket from a junkyard. Just wondering if there's something I missed.
When you see the gasket you'll understand. The airbox halves have a gap between them that is larger than silicone or epoxy will fill. I don't mind DIYs... hell, I was DIY'ing my RS before most of you even heard of one but some things really should be done right. Either remove the airbox and replace with an aftermarket intake or seal the box correctly.
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Old 08-07-2003, 02:19 PM   #19
Andrew Bacon
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If you like to rev freely over 4,500 RPM, I say dump the airbox all together and get an intake.

If you want to pull tree stumps or have to haul a 220 pound passenger around town, keep the box.

...And $.98 makes a dollar
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Old 08-07-2003, 02:30 PM   #20
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Yeah, I tend to prefer doing the DIY stuff, bein broke and all. :-) I'll have to go check out the box, I think you're right the gap is too big. Didn't think of that.
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Old 08-10-2003, 01:37 PM   #21
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Quote:
Originally posted by BOY
Just get the gasket .

Yep. There is a gasket made for the cars that doesn't have the filter in it. You can probably get from a dealership, i wouldn't be surprised if it was a subaru part number.

-Gagan, whos got the gasket... (came with car)
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Old 08-10-2003, 04:12 PM   #22
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yes it is a subaru specific part and made for the 99 rs...i have one..it was like 35 bucks and has plastic brackets for rigidity, surrounded by a nice rubber gasket...
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