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Discussion Starter #1
I am posting here because exhaust is the only change I have to relate to. My LLY has the fast idle for cold morning starts. Usually kicks in about a minute or so after starting up. (18 degrees this AM) Last week had a Magnaflow SS 4" put on, Magnaflow straight thru muffler and the kitty disappeared. Now has a NICE deep rumble sound :cool2: Since then the truck seems to have lost the fast idle warmup in the morning.

I don't think it is that much of a problem, if any, just wondering if anyone else has noticed the same result of the larger exhaust.
 

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Mike, Sure you didnt turn it off in the DIC?
 

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Discussion Starter #3
The truck is a LS I don't have the on/off option available to me.
 

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OK, just went out to parking lot for coffee break - no smoking in the office - thumbing through the Duramax booklet. Page 2-5 says how to set fast idle without steerwheel buttons. Don't know why they were shut off, never touched it since new. One lesson learned, R.T.F.D. :D
 

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You will likely lose that fast warmup time as well. I found when I did the cat removal and 4 inch exhaust the fast idle didn't work nearly as well as it did stock.
 
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