jefffoxsr
Michigan
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Joined: 03/25/2002
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When the vehicle is running for the first few minutes the rpm will jump from 500 to 900 over and over. My code scanner says there are no codes. The check engine light has not come on. It has been doing this for a few months and I have been waiting for a code so I can repair the situation.
What might be causing this idle issue?
Thanks.
Jeff
2004 Sunnybrook 2726 Travel Trailer ( ~7,400 # Loaded, 28' )
2004 GMC Sierra 2500 HD 4 x 4 Crew Cab 8.1 / Allison / 3.73 ( 6,810 # with no passengers )
Reese Dual Cam
Honda EU 2000i Generator
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glamisorbust
Arizona
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Joined: 10/14/2009
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Does your truck have the "high idle" option? My duramax does, and if it's cold enough it will come on to warm the truck up faster. The truck knows how cold it is outside though, and even if you have it turned on, it still has to be cold enough outside to activate the switch. I don't know what the exact temperature is, but seems like it's maybe around 35 degrees. Just an idea.
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nremtp143
Georgia
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Joined: 08/29/2010
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Could be a MAF sensor or the idle air control valve. Also check the EGR. Any of these 3 or a combo of any could do what you are describing.
2012 Sandpiper 365SAQ, Goodyear G614s, TST TPMS
2010 F350 DRW 6.4L 4x4, Edge CTS, B&W Companion, Viair 10007 air system, Firestone Ride-Rites,Flo-Pro cold air pipe
2001 Excursion Limited 7.3L 4x4, V/B Springs
2001 Silverado 3500 DRW CCLB 8.1L/Allison 4x4
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Perrysburg Dodgeboy
Perrysburg, Ohio USA
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Joined: 12/06/2003
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I wolud look at the idle air motor and EGR also. Had a Stratus that did the same thing. Would clean the AIM about every four months until I replaced it and the EGR.
Don
Perrysburg Dodgeboy
2004 Dodge Ram 2500 Quad Cab SLT Cummins HO
2005 Keystone Cougar 304 BHS
Chrysler the only one to pay back 100% of their loans from the Government. *The Old Car Company" still owes 1.6 billion. Is that better Chuckles 
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jerem0621
Sequatchie, TN
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Joined: 05/17/2009
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Something simple as a fuel filter?
Thanks!
TT: 1995 Layton 2910
Tow Vehicle: 1999 F-350, v10, 2wd, Crew Cab, Dually
Hitch: Draw-Tite Trunnion WD Hitch
Sway Control: Valley dual friction sway control
Brake Control: Tekonsha Voyager
"It's Kind of Fun To Do The Impossible"
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MitchF150
Washington, the State
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Joined: 07/13/2002
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Not sure on the GM's, but a reset of the ECU might fix things up? You should just have to disconnect the battery for about 15-20 minutes and that should do it. Restart the truck and don't touch the gas pedal. Let the computer find it's idle speed on it's own.
Downside is you will lose your radio pre sets and if you are close to getting an emissions test, you'll have to drive around a bit to get the ECU set so it clears it's initialization codes.
Good luck
Mitch
*Anything I post is for entertainment purposes only and what usually works for me.. Your Mileage May Vary.. 
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Perrysburg Dodgeboy
Perrysburg, Ohio USA
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Joined: 12/06/2003
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No emissions test to worry about in Mich that I know of. If you remove the AIM and clean it carefully check the tapered portion for a grove. If it has one replace the unit.
Don
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esfd243
East Syracuse, NY
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Joined: 07/30/2008
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My 2012 does this as well. Its the high idle bringing the engine up to temp from a cold start. I have been told this by the dealer and a well known independant diesel shop. I feel good about it.
Mike, Dawn & Mallori
2011 Keystone Cougar 324RLB (1st 5th wheel)
2012 Chevy 2500 HD D/A 3.73
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