Fast idle question.
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Seasoned HDF Member
Joined: Mar 2012
Posts: 100,455
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From: Centennial, CO
Fast idle question.
Hey guys and gals, need a little diagnostic help.
Recently, my '04 FXSTI has been idling between 1500-2000 rpm at cold start-up in the mornings. Temps have been in the mid 50s-60s. This will last for up to a minute before settling down into the normal 950-1050 rpm. In the past, fast idle would last about 15 seconds or so. I have a service manual but not a electrical/EFI manual. Any advice would be appreciated.
Recently, my '04 FXSTI has been idling between 1500-2000 rpm at cold start-up in the mornings. Temps have been in the mid 50s-60s. This will last for up to a minute before settling down into the normal 950-1050 rpm. In the past, fast idle would last about 15 seconds or so. I have a service manual but not a electrical/EFI manual. Any advice would be appreciated.
2nd Gear
Joined: Dec 2012
Posts: 6
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From: Medical Lake, WA
If you have the ability to access your idle map, I would look at the map and see if something had changed, if it looks normal, then I would not worry about it. If not you can make an adjustment there.
Road Warrior
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Joined: Mar 2010
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From: Honah Lee
Sounds high to me, but if the ECM reads the idle off by +/-200 for more the 5 seconds, it should throw a code P0505 loss of idle speed control. Since you are not seeing that, are you sure your push/pull throttle cable is not just a little off and sticking the throttle slightly open until a little warmth correct it. Before you start it cold again, snap the throttle and make sure there is a slight amount of play in both cables at throttle body and you here the butterfly hitting the stop. I have the 04 electrical diagnostic manual, and I will bone up on the idle control. How close to stock are you? I only get 2000 rpm at close to 34 degrees start up.
Last edited by Jackie Paper; Jul 2, 2013 at 08:25 PM.
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Thread Starter
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Seasoned HDF Member
Joined: Mar 2012
Posts: 100,455
Likes: 19,810
From: Centennial, CO
Not stock. 98" Hillside kit and V&H Longshots. Just started doing this recently. Last couple weeks. Appreciate the ideas. Slapping myself for not thinkin of checking a code or the cables.
Advanced
Joined: Jan 2012
Posts: 85
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From: Merrimac Ma
BTW, Threw a Bassani RR2 on my 98, pushing 107hp/110tq now. She's running like a Top!!!