Apex Rough Idle at cold startup

[Bigvander]

07 apex with just over 10k miles idles very rough when first started for the day. Seems like it isn't firing on all cylinders. It stalls sometimes too unless I give it some throttle. Donuts, flex pipes, and pipes were replaced last year (600 miles ago). After a minute or so it idles fine.

I also have a loud rattle at idle. Sounds like it is coming from the muffler but I do see exhaust floating around above the track up front near the axle. It is not the exchangers or cross pipe being loose as I've looked into that. I haven't removed the exhaust yet but I didn't see any noticeable cracks at the muffler y-pipe.

Could a donut have failed in 600 miles and cause both of my above issues? Any other ideas?

 

[psledhead]

Did you replace the Y-pipes?
If so, with titanium or stainless?
My left side titanium broke within 500 miles of replacing the donuts on mine last year.

 

[steiner]

Had an improperly tightened donut clamp cause this after we serviced the donuts and pipes. Rattled when cold and got quiter as the engine warmed up

 

[kidastra]

happened to mine the other day in -40 weather, only happened on the first start of the day. Went away once the temp light turned off. I figured it was cause of the cold

 

[Bigvander]

A dealer replaced them under YES so I don't know what material they used. They replaced everything but the muffler. My YES just expired a few days ago. It was -10 when it first did it but was 30 today and still did it.

 

[Bigvander]

It ended up being a cracked muffler. $1000 to fix. Ouch.

 

[kidastra]

It ended up being a cracked muffler. $1000 to fix. Ouch.

isn't the muffler stainless and repairable by welding?

1000$ the muffler new is 450! who's charging you 550 to install it?

 

[Bigvander]

Yea that is my plan once I get it back. I was just hoping it was covered under some recent warranty work.

 

[kidastra]

ok you haven't paid 1000 yet,

 

[Bigvander]

Nope. They may ding me a few bills for diagnosis.

 

[Viper_Dave]

Where you located? I've got a stock 06 muffler just sitting in the garage. PM me if your interested.

 

[Bigvander]

Grand rapids, mi. How much use?

 

[Viper_Dave]

It was on the sled for around 4,000 miles. I swapped it for Hauck exhaust and it now has an under tunnel .

 

[Rich Kay]

My 07 apex does that when real cold soaked...like 0 out or less. Just start the thing and leave it be.(I dont touch the throttle) Mine sounds like it will almost stall then it will slowly smooth out to a purr. the rest of the day stop and starting is normal.

 

[kidastra]

My 07 apex does that when real cold soaked...like 0 out or less. Just start the thing and leave it be.(I dont touch the throttle) Mine sounds like it will almost stall then it will slowly smooth out to a purr. the rest of the day stop and starting is normal.

same thing as mine, happened once in -40