View Poll Results: Is it possible for a muffler to be "broken"?
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Could a bad muffler even cause any KR?
#1
Senior Member
True Car Nut
Thread Starter
Could a bad muffler even cause any KR?
My car clearly has an issue with KR, too much backpressure it seems, plenty of fuel, just at the 1-2 and 2-3 shifts it goes from 0 to 20*. So therefore I'd say it seems there is a lot of exhaust buildup when the RPMs go from 5300 or whatever to whatever it is after it shifts gears.
On startup and if reving, my muffler clearly makes a loud obvoius rattling noise, something is broken in there, but in my experience a muffler looks like this:
I assume the stock muffler on the ville'* is just like this.
I dont see how it would be possible for anything to be broken that would cause problems unless one of the pipes inside there is broken and rattling around.
On startup and if reving, my muffler clearly makes a loud obvoius rattling noise, something is broken in there, but in my experience a muffler looks like this:
I assume the stock muffler on the ville'* is just like this.
I dont see how it would be possible for anything to be broken that would cause problems unless one of the pipes inside there is broken and rattling around.
#3
I really cant see how a muffler could cause real KR. I could see an exhaust rattling causing false KR though.
Any KR that jumps really high really quickly is usually false. Since you said that it is at the shifts I am almost certain it is false. Start looking for loose parts and exhaust leeks.
Any KR that jumps really high really quickly is usually false. Since you said that it is at the shifts I am almost certain it is false. Start looking for loose parts and exhaust leeks.
#4
Senior Member
True Car Nut
Thread Starter
Originally Posted by PURENVY
I really cant see how a muffler could cause real KR. I could see an exhaust rattling causing false KR though.
Any KR that jumps really high really quickly is usually false. Since you said that it is at the shifts I am almost certain it is false. Start looking for loose parts and exhaust leeks.
Any KR that jumps really high really quickly is usually false. Since you said that it is at the shifts I am almost certain it is false. Start looking for loose parts and exhaust leeks.
At 3500rpm shifts I still get 20 degrees of KR at times. Freakin weird.
#5
DINOSAURUS BOOSTUS
Expert Gearhead
Not sure if that is what the muffler looks like on the inside. I'm going through a bit of muffler issues myself and have found that our mufflers are "unique" internally .
#6
Originally Posted by Hans
Originally Posted by PURENVY
I really cant see how a muffler could cause real KR. I could see an exhaust rattling causing false KR though.
Any KR that jumps really high really quickly is usually false. Since you said that it is at the shifts I am almost certain it is false. Start looking for loose parts and exhaust leeks.
Any KR that jumps really high really quickly is usually false. Since you said that it is at the shifts I am almost certain it is false. Start looking for loose parts and exhaust leeks.
At 3500rpm shifts I still get 20 degrees of KR at times. Freakin weird.
Few ?'*...
Do you get KR any other time? WOT?
Is the KR just when you shift at part throttle (3500RPM). Or on every shift?
When you get this KR what does your timing go to? Does it jump back quickly?
#7
Senior Member
True Car Nut
Join Date: Aug 2004
Location: In your garage, swipin' da lug nutz
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Have you replaced the knock sensor itself? Over time, they tend to pick up false knock pretty easy because of how they are built internally.
The rattling could also be pieces of the old cat, or weld material that has come loose somehow.
The rattling could also be pieces of the old cat, or weld material that has come loose somehow.
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