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Old 06-22-2011, 10:54 PM   Thread Starter #1
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Default Would A Flattened Y-Pipe Cause A Stall??

MY 2004 max has a racingline precats and racingline y-pipe....not sure when it happened but both tubes from the y-pipe leading to the cats are pretty banged up....where the sensor attaches to the y-pipe is pretty much flattened .....when I start the car the rpm drops and shuts off...I will start it a second time ...the rpm will drop and almost cut off but then idle...car also sounds different and there is no check CEL light and the car runs and idles fine only have the problem on start up.....could the damage to the y-pipe cause this stalling problem
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Old 06-22-2011, 11:11 PM   #2
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Default Re: Would A Flattened Y-Pipe Cause A Stall??

Nope, if the pipe was the cause, it would be a constant problem. Might have something to do with air filter, sparkplugs or coil-packs.
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Old 06-22-2011, 11:49 PM   #3
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Default Re: Would A Flattened Y-Pipe Cause A Stall??

I have the same issue. It all started last summer when my car was in the shop. They cut out my old flex pipe and installed a new flex area which was noticeably smaller. The first time I started my car up after the rpm's dropped and immediately shut off. They said it was normal for the ECU to relearn the start up after being disconnected. Regardless if that was true it would work here and there.

Still having issues now and then, and while Shayne and I were doing my pads yesterday we noticed the flex area is shredded again so looks like i'm just going to buy a whole new Y-pipe and see what happens.
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Old 06-23-2011, 02:25 AM   #4
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Default Re: Would A Flattened Y-Pipe Cause A Stall??

mystery, you got a lemon for sure. wow.

OP, good luck and keep us updated.
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Old 06-23-2011, 05:30 AM   Thread Starter #5
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Default Re: Would A Flattened Y-Pipe Cause A Stall??

Still no CEL code....and still stalling on start up...going to take it to a exhaust shop and see if they can work some magic on the y-pipe......I believe it's the damage to the y-pipe..but I could be wrong
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Old 10-17-2012, 06:41 PM   #6
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Default Re: Would A Flattened Y-Pipe Cause A Stall??

Hey what did you find out with this issue, I'm having sorta the same problem after my exhaust broke completely in 2, I replace the ebay catback with the stock exhaust system and the car still stalls, even stalls during shifting if I take too long to go into the next gear. I have to bring the rpm down in gear to about 1k rpm before I can push my clutch in. Any help would be great !
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Old 10-17-2012, 11:43 PM   #7
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Default Re: Would A Flattened Y-Pipe Cause A Stall??

Originally Posted by Copper_maximus View Post
Hey what did you find out with this issue, I'm having sorta the same problem after my exhaust broke completely in 2, I replace the ebay catback with the stock exhaust system and the car still stalls, even stalls during shifting if I take too long to go into the next gear. I have to bring the rpm down in gear to about 1k rpm before I can push my clutch in. Any help would be great !
I'm assuming you are 6MT? What is your idle RPM with engine warmed up?
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Old 10-18-2012, 02:26 AM   #8
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Default Re: Would A Flattened Y-Pipe Cause A Stall??

Well ever since the exhaust broke its been idling alittle lower than before im guessing around 500rpm and 750 is normal ?
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