Fast Idle No longer Functioning?
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Senior User
Joined: Jan 2002
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From: waterford nj
Fast Idle No longer Functioning?
I have noticed this fall as the weather got cold the fast idle feature on my o2 7.3 doesn't seem to be working.
It used to sound like a plane was readying for takeoff but now it occassionally revs around 900 r's in the morning before I leave.
I did switch to 5w40 synthetic a month ago but I doubt that has anything to do with it.
The exhaust valve seems to be working as I can hear the hiss and feel the restriction on the cold mornings.
Any ideas? Is there a temp sensor for the high idle> A fuse?
Any help will be appreciated.
Thanks.
Scott
It used to sound like a plane was readying for takeoff but now it occassionally revs around 900 r's in the morning before I leave.
I did switch to 5w40 synthetic a month ago but I doubt that has anything to do with it.
The exhaust valve seems to be working as I can hear the hiss and feel the restriction on the cold mornings.
Any ideas? Is there a temp sensor for the high idle> A fuse?
Any help will be appreciated.
Thanks.
Scott
Fleet Owner
Joined: Jun 2004
Posts: 25,090
Likes: 1,112
From: Rio Rico, AZ.
Does your parking brake indicator still work?
Mine will refuse to fast idle if the ECU thinks the parking brake is not set. I found that out one day when I dislodged the wire from the switch without realizing it.
Mine will refuse to fast idle if the ECU thinks the parking brake is not set. I found that out one day when I dislodged the wire from the switch without realizing it.
Freshman User
Joined: Apr 2005
Posts: 37
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From: Oro Station, Ontario
I noticed that with my truck unless the emergency brake dash light is activated it won't go into high idle. ( my swich is intermitted) Might be something to for you to check out.
sorry Kwik beat me to it
sorry Kwik beat me to it
Senior User
Joined: Apr 2004
Posts: 340
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From: Maryland
Originally Posted by Kwikkordead
Does your parking brake indicator still work?
Mine will refuse to fast idle if the ECU thinks the parking brake is not set. I found that out one day when I dislodged the wire from the switch without realizing it.
Mine will refuse to fast idle if the ECU thinks the parking brake is not set. I found that out one day when I dislodged the wire from the switch without realizing it.
Freshman User
Joined: Apr 2005
Posts: 37
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From: Oro Station, Ontario
Originally Posted by SilverBullet131313
I noticed that too the other day. My parking brake light works sometimes...and other times it dont. And high idle is affected. What is causing the light to be intermittent?
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Senior User
Joined: Jan 2002
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From: waterford nj
I rarely use the parking brake overnight at home since I have a stick and I usually park on a fairly level surface.
I never noticed a relationship between the fast idle and having the e-brake on.
I'll have to try setting the brake and see what happens.
Scott
I never noticed a relationship between the fast idle and having the e-brake on.
I'll have to try setting the brake and see what happens.
Scott
FTE Leadership Emeritus
Joined: May 2001
Posts: 13,653
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From: Cabot, Arkansas
Originally Posted by rednekf350
I rarely use the parking brake overnight at home since I have a stick and I usually park on a fairly level surface.
I never noticed a relationship between the fast idle and having the e-brake on.
I'll have to try setting the brake and see what happens.
Scott
I never noticed a relationship between the fast idle and having the e-brake on.
I'll have to try setting the brake and see what happens.
Scott
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Elder User
Joined: Jul 2002
Posts: 523
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From: Illinois
This is kind of the opposite, but how does one disable this? I think I heard somewhere you can just cut that temp sensor off at the loom but that seems like it would light the SES. Is this true? Just makes me cringe to hear that thing rattle when it takes off in the cold weather.
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