High rpm on startup | Ford Explorer - Ford Ranger Forums - Serious Explorations

  • Register Today It's free! This box and some ads will disappear once registered!

High rpm on startup

bryris

Member
Joined
April 19, 2013
Messages
42
Reaction score
0
City, State
Lakeland, FL
Year, Model & Trim Level
2006 Ford Explorer
4.0 motor, 2006 EB.

On a cold start, it'll idle about 1,500rpm or so for about 2 minutes. If I put into gear it'll behave normally. If I let it idle, after the two minutes it'll slowly drop down to regular idle. Intermittently, during this initial phase, if I turn on the AC, it'll surge to near 2k rpm for a second.

Seems strange. I know cars will idle a bit fast on cold start, but 2 min?? Usually only for 15-20 Secs on most cars.
 
<

Join the Elite Explorers $20 Gets rid of the ads!

Elite Explorer members see no advertisements, no banner ads, no double underlined links, can add their own profile photo, upload photo attachments in all forums, and Media Gallery, create and save more private conversations, and more. Join Today. Your support is greatly appreciated.




BrooklynBay

Moderator & long time member.
Staff member
Moderator
Elite Explorer
Joined
November 11, 2005
Messages
55,304
Reaction score
738
City, State
Brooklyn, NY
Year, Model & Trim Level
88 89 93 95 96 Aerostars
<



corkey

Moderator Emeritus
Moderator Emeritus
Joined
January 3, 2008
Messages
6,007
Reaction score
48
Location
Sioux Narrows Canada
City, State
Elite Canuck,multiple ifs offender,, and musky maniac,, i wheel and i fish,,
Year, Model & Trim Level
99 xls,96 xl,91,08 Ranger
until the engine reaches a certain temp it will do that,,

other reason for it would be oxygen sensor heatup times,, going from open to closed loop,, that takes time,,,
 
<



BrooklynBay

Moderator & long time member.
Staff member
Moderator
Elite Explorer
Joined
November 11, 2005
Messages
55,304
Reaction score
738
City, State
Brooklyn, NY
Year, Model & Trim Level
88 89 93 95 96 Aerostars
<



MotorCityFats13

Explorer Addict
Joined
January 25, 2015
Messages
1,080
Reaction score
78
City, State
Flatrock MI
Year, Model & Trim Level
2007 Explorer XLT 4.0L
if it did this all the time I would suspect a bad IAC valve, that is if they still have those on the TB after the 3rd gen.... from my understanding you have 2 sets of O2 sensors ones that heat them selfs up and ones that need to get warm the ones that heat up take over open loop until the other set get warmed up by the exhaust so there would be no need to run the EGT's up with higher RPM's
 
<



Jimmy69

New Member
Joined
February 22, 2015
Messages
7
Reaction score
0
City, State
Dubai
Year, Model & Trim Level
2006 ford explorer
I wonder why everyone is forgetting how important the ECTS is. This is worth a try. First check this sensor for resistance because this particular sensor affects your egr evap startup and a lot of different things that has to do with the engine. It will cause you rough idle, hesitation, stalling, rich condition. All you need is ohm meter or multimeter.
 
<



Jimmy69

New Member
Joined
February 22, 2015
Messages
7
Reaction score
0
City, State
Dubai
Year, Model & Trim Level
2006 ford explorer
If you have a faulty ect sensor that stuck in hot it will send signal to your pcm to reduce the fuel mixture because the signal sent from a faulty sensor is that the engine is in its operating temperature while infact youre only about to start you car and this will cause you a lean condition, hesitation and even stall. While a faulty sensor that is stuck cold will cause rich condition, High rpm at idle rough idle, black smoke and will affect the egr valve not to open because the the signal sent to pcm is that the engine is still warming up. Hope this will help.
 
<



BrooklynBay

Moderator & long time member.
Staff member
Moderator
Elite Explorer
Joined
November 11, 2005
Messages
55,304
Reaction score
738
City, State
Brooklyn, NY
Year, Model & Trim Level
88 89 93 95 96 Aerostars
41928895.gif
 
<



Top