High idle at cold start
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Junior User
Joined: Jul 2005
Posts: 83
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High idle at cold start
Gentlemen-
What's with the high idle at a cold start, is that normal? When I start my truck it immediatly revs up to about 2000rpm and slowly drops over 30 seconds or so (no, I dont have the foot on the gas). Is this just a ford thing? I go to work at 4 am and with the combination of high idle and exhaust, I am waiting for the neighbors to complain.
What's with the high idle at a cold start, is that normal? When I start my truck it immediatly revs up to about 2000rpm and slowly drops over 30 seconds or so (no, I dont have the foot on the gas). Is this just a ford thing? I go to work at 4 am and with the combination of high idle and exhaust, I am waiting for the neighbors to complain.
Senior User
Joined: Apr 2003
Posts: 205
Likes: 0
From: Los Angeles, CA
Personally, I like the cold start/high idle. Gets the engine warm for me while i do other things (run inside to grab my coffee, throw some things in the back of the truck, put my sun glasses on...etc)...92merc's right though, it sounds hella loud with my flowmaster on it...but I like it that way! 
-Louie
-Louie
Tuned
Joined: Sep 2005
Posts: 331
Likes: 1
From: Charlton, NY
Even when the temp is 50F outside, my 5.4 2005 SCrew initially idles near 2000RPM after a cold start and takes about 45sec before the idle drops below 1000RPM. Is this normal? Some have mentioned that reflashing has solved their problem. How does your (fomocojoe101 or others) truck behave during a cold idle after it had been reflashed?
Thanks
Thanks
Mountain Pass
Joined: Dec 2004
Posts: 221
Likes: 2
From: Calgary, Alberta
My '04 5.4l does the same thing. Takes about 30 seconds to calm down but not to bad. Remember the days of carburators with "automatic" chokes? They would high idle till you stomped on the gas a couple of times. Oh how times have changed. It nice to have a vehicle that will start in severe cold with out being plugged in.
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Freshman User
Joined: Jun 2004
Posts: 34
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From: Boone Co. KY (Home) Magof
Hey guys,
A high idle after a cold start is normal. Most modern cars do it. The primary function of fast idle is to warm up the catalytic converters, getting them to the most efficient operating temperature as quickly as possible. We all know a hot cat is the best cat! This feature helps reduce emissions and will get that heat/defrost going for those cold mornings.
A high idle after a cold start is normal. Most modern cars do it. The primary function of fast idle is to warm up the catalytic converters, getting them to the most efficient operating temperature as quickly as possible. We all know a hot cat is the best cat! This feature helps reduce emissions and will get that heat/defrost going for those cold mornings.
Last edited by fredjeep; Nov 5, 2005 at 12:15 AM.
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More Turbo
Joined: Aug 2004
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From: Rodeo, Ca.
Originally Posted by Ted928
Rancheroracer or other reflashers,
Please describe how your engine now idle during a cold start.
Thanks
Please describe how your engine now idle during a cold start.
Thanks
New User
Joined: Dec 2005
Posts: 1
Likes: 0
Sorry that I am coming to this late but I have the same situation but for the last couple of days, there is also puff of white smoke that comes out after my 2001 F150 Supercrew has been sitting for a little while (overnight, several hours). I'm down in Dallas so 20 degree weather is not the issue. Never had the high idle before. It started just a few months ago. Do I need to see a mechanic?
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