Exhaust header to Ypipe flange gasket? - Page 2 - JeepForum.com

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post #16 of 17 Old 03-18-2017, 12:22 PM
Walt
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2008 WK 
 
Join Date: Oct 2009
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Quote:
Originally Posted by zenoise View Post
....... The sound usually is usually only heard from the drivers side. Passenger side it sounded fine.....After driving it he did hear it but couldn't understand what was leaking. He momentarily blocked off the exhaust while I listened for hissing. And there was none.

My question is... WTH?? Lol.
Could it be the EGR?
Could it be the mani to mid pipe flange needs re-torquing?
It doesn't seem to leak there though.

I've heard others say after they replaced their EGR their engine got a lot quieter.


Any ideas???
1. See my 03/07/17 post regarding flange tightening.
2. EGR valve is normally closed at idle and at closed throttle deceleration.
3. When I get a small air leak in the exhaust, I get an oxygen sensor slow response from the front sensor on the side where the leak occurs. Did you get any set or pending codes (like P0133)?


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post #17 of 17 Old 03-18-2017, 06:47 PM Thread Starter
zenoise
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Join Date: Sep 2013
Location: Igloo
Posts: 23
Quote:
Originally Posted by Walt View Post
Quote:
Originally Posted by zenoise View Post
....... The sound usually is usually only heard from the drivers side. Passenger side it sounded fine.....After driving it he did hear it but couldn't understand what was leaking. He momentarily blocked off the exhaust while I listened for hissing. And there was none.

My question is... WTH?? Lol.
Could it be the EGR?
Could it be the mani to mid pipe flange needs re-torquing?
It doesn't seem to leak there though.

I've heard others say after they replaced their EGR their engine got a lot quieter.


Any ideas???
1. See my 03/07/17 post regarding flange tightening.
2. EGR valve is normally closed at idle and at closed throttle deceleration.
3. When I get a small air leak in the exhaust, I get an oxygen sensor slow response from the front sensor on the side where the leak occurs. Did you get any set or pending codes (like P0133)?
The exhaust leak is happening during accelation and low rpm cruising.... that I can hear...

I have a wireless OBD2 reader app and I used to get a pending "slow 02 response" code before the manifold gaskets were done but never a permanent code (CEL). Now that the gaskets are done. I don't even get a pending code. And I monitor the up stream 02 sensors voltage and it's normal.

So I really don't think it's the manifold gaskets.... due to everything stated in my earlier posts...

I'm soon to retorque the flanges but I don't feel it's that because when we blocked the tailpipe there was no hissing or anything coming from there....

I'm thinking EGR. But I'm obviously up for other opinions or guesses.

Thank you.
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