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post #1 of 6 Old 03-11-2011, 11:26 AM Thread Starter
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Uhmm?

So interesting story. A van was driving in front of me yesterday, and half- yes half- of it's exhaust fell off..on the highway. It came off, bounced under my car, tore a hole in my Cobb downpipe, and busted a flange on my GReddy Evo 2 exhaust right before the muffler.

Needless to say, the car ran kinda rich until I got home to cut out the damaged downpipe section and re-weld in some more piping. But, i'm still running rich. And now I'm confused. While cruising, my car is anywhere between 13:7 to 14:4 AFR's. It's normally in the ideal range of high 14's, low 15's just cruising.

I'm running out of ideas as to why it's running rich still? I'm not throwing a CEL, and I can't SEE any cracks in the compressor housing ( that doesn't mean they aren't there I suppose..). I can hear a faint whistle from the motor, but given this incident, it's hard to decide whether or not it's just my itty bitty td04 spooling up, or if it's leaking.

Is it possible that A. The turbo cracked? B. The up-pipe got knocked loose? or C. I have an exhaust manifold leak? Would any of these things cause my rich condition? I didn't see any scrapes or marks on anything besides a crossmember and of course the gaping Titanic-like wound in my poor downpipe. Ideas? Thanks!
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post #2 of 6 Old 03-11-2011, 12:53 PM
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Quote:
Originally Posted by Junior2552 View Post
Is it possible that A. The turbo cracked? B. The up-pipe got knocked loose? or C. I have an exhaust manifold leak? Would any of these things cause my rich condition? I didn't see any scrapes or marks on anything besides a crossmember and of course the gaping Titanic-like wound in my poor downpipe. Ideas? Thanks!

All of the above, yes.

You know that person's Auto insurance will cover your damages. Have you looked at your o2 sensor?

Edit:
BTW.. Where was this extra piping welded in at ? What portion of the DP ?

Paul
2002 WRX Sold
2007 WRX Sold
2007 STi totaled
2007 Foz XT sold
2007 MS3

Last edited by pzr2874; 03-11-2011 at 01:00 PM. Reason: Adding
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post #3 of 6 Old 03-11-2011, 01:05 PM
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I would check the gaskets first. It's less likely the manifold broke or cracked enough to cause a leak that you couldn't see. If that whistle has a pulse to it, that will just better confirm that it's a leak. If it's a consistent whistle, I doubt it's exhaust related. Are the O2 sensors alright? Front and rear? I still think those would throw a CEL, except that the rear one is controlled by your tune, so no CEL would appear even if it weren't reading right. Sorry I can't really offer more than that.

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post #4 of 6 Old 03-11-2011, 06:06 PM Thread Starter
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Originally Posted by pzr2874 View Post
All of the above, yes.

You know that person's Auto insurance will cover your damages. Have you looked at your o2 sensor?

Edit:
BTW.. Where was this extra piping welded in at ? What portion of the DP ?
The extra piping was welded in on the ONLY straight part of the down pipe. It's after the second bend in the pipe, right before the mid pipe. It's all sealed up and everything. And, unfortunately I didn't get to catch the guy to get his information. So the insurance won't cover anything.
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post #5 of 6 Old 03-11-2011, 06:12 PM Thread Starter
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Originally Posted by Hondafan View Post
I would check the gaskets first. It's less likely the manifold broke or cracked enough to cause a leak that you couldn't see. If that whistle has a pulse to it, that will just better confirm that it's a leak. If it's a consistent whistle, I doubt it's exhaust related. Are the O2 sensors alright? Front and rear? I still think those would throw a CEL, except that the rear one is controlled by your tune, so no CEL would appear even if it weren't reading right. Sorry I can't really offer more than that.
I tried checking the gaskets, but I can't see any carbon build up or anything around any connections. The whistle doesn't have a pulse to it I don't believe, it's just a pretty loud whistle up and then down. The O2 sensors LOOK alright, but the rear one was really close to the impact, so maybe it got wet, or something hurt it. So I should probably replace it and see if that at least helps. If not, I'll look into other options. I can hear a ticking up front from under the car, but it's hard to differentiate between exhaust tick or valve tick. Stupid Subarus!.. I joke. Thanks for the input though!
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post #6 of 6 Old 03-14-2011, 06:41 AM
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Have a way to log data?

Paul
2002 WRX Sold
2007 WRX Sold
2007 STi totaled
2007 Foz XT sold
2007 MS3
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