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Old 07-20-2006, 11:53 PM   #1
horrorbiz
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Join Date: Dec 2004
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13 SSM BRZ
06 Impreza 2.5i

Default Pulsating exhaust noise and stuttering..HELP!

Hello. Since I am a mechanical rookie, I come to you all for insight. The other day I noticed my exhaust sounding like it was pulsating (vrrm-vrrm vrrm-vvvrrm) If that makes any sense. I checked my RPMs and they weren't going up and down. Today I noticed it was doing it a bit more, still the RPMs were not going up and down, however it was idling low at about 250.. instead of the usual 500-750. The exhaust was shaking so much from the pulsating (don't know a better word to use) that it was rattling my heat sheild. When I got home and put it in neutral it almost stalled.

Background:
2000 RS
power mods:
perrin lightweight crank pulley
cobb CAI
SPT axle back with a straight 2.25" pipe welded from the cat back to it.

I have had a check engine light on for sometime.
Subaru told me a couple months ago it was the catalytic converter
and both O2 sensors. They quoted something like $1400. I didn't have the money at the time so I decided to wait.

What's wrong with my car? Is it the O2 sensor going crazy or what?
Thanks for the help in advance I really appreciate it.
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Old 07-21-2006, 12:23 AM   #2
moogoob
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sounds similar to what i called my broom broom idle

http://forums.nasioc.com/forums/show...ght=broom+idle

mine may have been gas, another reported the o2 sensor replaced helped.... and no way is it $1400....
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Old 07-21-2006, 12:57 AM   #3
horrorbiz
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06 Impreza 2.5i

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"broom broom" idle haha that's really good! Yours sounds exactly like what mine is doing. You just described it better. Thanks for your help.
I'm sorry for such a noobie question, but is the 02 sensor something I can bring to a local shop and have them do relatively quickly? Any idea how much it would cost? I just moved and I don't have a lot of tools available,lift/jacks or the experience to do this myself.
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Old 07-21-2006, 03:13 PM   #4
4wdrift
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$10 in hand tools, a jack (stands), a little patience, and you could install your own.
Go take a look at it. You have nothing to loose and you will have the satisfaction of
accomplishing something on your car, by yourself.

E.
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Old 07-21-2006, 06:06 PM   #5
Jeromee
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Quote:
Originally Posted by 4wdrift
$10 in hand tools, a jack (stands), a little patience, and you could install your own.
Go take a look at it. You have nothing to loose and you will have the satisfaction of
accomplishing something on your car, by yourself.

E.
or he could twist it off in the cat and open up a whole bag of worms... but yanno... no sweat.
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Old 07-21-2006, 03:14 PM   #6
4wdrift
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....otherwise you pay for the $60 plus per hour in labor to get it done...
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Old 07-21-2006, 08:49 PM   #7
horrorbiz
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Update:
I brought it a local shop this morning and they informed me that in addition to the cats (which they quoted an insane amount) the exhaust had some sloppy welds and was leaking a bit.

This is my idea, tell me if it makes sense, and if I would benefit from it, and lastly does anyone have an idea of what it would cost:

MY friend just bought an 06 WRX, he bought the SPT catback and gave me his stock catback.

PLAN: I go to a local shop and have the catback modified to fit on my car (shouldn't be that big of a deal right? I'm assuming it just needs some flanges rotated and maybe an extension.[ps I got this info from doing a search]) and then have them mate that up to a universal highflow cat in replacement of the subaru double cat pipe thing with new 02 sensors and call it a day.

Will this work? Or am I just a crazy noob?

I really appreciate all the help. I am hoping to get this done early and still make it to the meet in Danbury CT that evening! haha
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Old 07-24-2006, 07:56 AM   #8
grifter
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San Remo Red

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Quote:
Originally Posted by horrorbiz
I have had a check engine light on for sometime.
Subaru told me a couple months ago it was the catalytic converter
and both O2 sensors. They quoted something like $1400. I didn't have the money at the time so I decided to wait.

What's wrong with my car? Is it the O2 sensor going crazy or what?
Thanks for the help in advance I really appreciate it.
Gee, do ya think it may be the part your car is telling you is broken???
Sounds like classic O2 sensor symptoms to me, from what I've seen in the past, at least. I wouldn't go to the dealer for that though, go to a smaller shop or do it yourself.
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Old 07-24-2006, 10:17 PM   #9
moogoob
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Quote:
Originally Posted by grifter
Gee, do ya think it may be the part your car is telling you is broken???
Sounds like classic O2 sensor symptoms to me, from what I've seen in the past, at least. I wouldn't go to the dealer for that though, go to a smaller shop or do it yourself.
I dont... my CEL came on and off after my exauhst went on. It had nothing to do with the sensor or the cat.....

I put in the antifouler fix and A OK on the CEL.

Two mechs told him its going to be astronomical $$ for new cats and other stuff. Its not so obvious when the poeple you should trust tell you there are big problems.

It may be as simple as bad gas as it was in my case. May be the sensor too as others have reported.

depending on the cell, try the mechanical fix, the rear o2 for the p0420 cell will not cause an idle issue. it would be a front o2 only.
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Old 07-24-2006, 10:06 AM   #10
horrorbiz
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06 Impreza 2.5i

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Yeah. That's what I said. "with new 02 sensors and call it a day"

Anyway, it's fixed. I had the WRX axle back mated to a new custom midpipe and replaced the front a/f O2 sensor and all is well.
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Old 07-24-2006, 11:23 AM   #11
Master2192
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I get this same problem now when the engine is between C and its normal operating temperature. Most likely because of the lightweight flywheel though. Once its up to temp though it goes away.
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