Possible y pipe bad and wierd exhaust tone change... - Ford Powerstroke Diesel Forum
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Old 01-22-2014, 06:01 PM
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Possible y pipe bad and wierd exhaust tone change...

Just like the the question states, I think I found the rattle that sounds like bearings in a tin can when idling in drive or driving at any mph. I now have a turbo whistle that can be heard over the heater fan inside as well as the radio when driving on the high way at 50-60 mph. So at this point I am assumig that the y pipe has cracked. I have no DTCs showing on the Scanguage and everything shows okay on the Torque App. I also noticed while waiting at a stop light in idle that the exhaust tone changed 2 times which makes me more certain that the y pipe is a goner. Any thoughts on a replacement and one that does not require an EGR delete (just replaced the EGR 2 weeks ago for $150.00 and don't want to lose that money).
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Old 01-23-2014, 08:05 PM
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What... did I stump someone? Can someone at least give an idea of why the exhaust tone would change tone at a stop light or waiting at a stop sign. I think the high pitch whistle im hearing from the turbo is pointing towards the y-pipe.
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Old 01-23-2014, 11:13 PM
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Sounds like your on the right track. If your hearing it change tones at idle I would crawl underneath with it running and listen.
Are ya sure the whistle isn't coming from your cap leaking pressure and causing a "tea kettle" pressure bleed off sound. I would look for coolant/white residue around degas bottle cap and check coolant level.
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Old 02-07-2014, 04:17 AM
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Mine has been doing the whistle/whine thing at 60 MPH and the rattly sound at idle, too. I narrowed down the rattle to the exhaust, as it stops if I put my foot on the tailpipe to keep it from moving. I suspect the cat may be failing inside.
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Old 02-07-2014, 06:18 AM
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Yep, that's what mine sounded like when the stock flex sections blew out.
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