Idle problems
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Cross-Country
Joined: Jun 2012
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Idle problems
Hey guys I was wondering I have a 92 f 150 extended cab long bed 4x4 with a 302 5 speed.....well it idles up and down sometimes then sometimes it doesn't want to idle at all or high idle......then sometimes it's perfect.......any ideas.....
Logistics Pro
Joined: Mar 2005
Posts: 4,698
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From: Mexico, Missouri
Do a search on here or Google and there is a plethora of information on how to and I'm sure video's.
Your wallet will thank you before throwing any parts at it.
Fleet Owner
Joined: Oct 2005
Posts: 20,786
Likes: 1,751
From: Kentucky
Code 21: ECT out of self test range 0.3 to 3.7 volts.
Code 24: ACT sensor out of self test range 0.3 to 3.7 volts.
Code 67 (KOEO): A/C ON during the KOEO tests.
Stored Codes (CM)
Code 29: Insufficient input from vehicle speed sensor.
Indicates the VSS signal has been low at some point during operation.
Code 33 (CM): EGR valve opening not detected.
Indicates the EGR feedback has not changed when the EGR was commanded open by the computer at some point during operation.
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Cross-Country
Joined: Jun 2012
Posts: 85
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Codes 21,24 indicate the truck was not fully warmed up before running the Key On Engine Off (KOEO) tests.
Code 21: ECT out of self test range 0.3 to 3.7 volts.
Code 24: ACT sensor out of self test range 0.3 to 3.7 volts.
Code 67 (KOEO): A/C ON during the KOEO tests.
Stored Codes (CM)
Code 29: Insufficient input from vehicle speed sensor.
Indicates the VSS signal has been low at some point during operation.
Code 33 (CM): EGR valve opening not detected.
Indicates the EGR feedback has not changed when the EGR was commanded open by the computer at some point during operation.
Code 21: ECT out of self test range 0.3 to 3.7 volts.
Code 24: ACT sensor out of self test range 0.3 to 3.7 volts.
Code 67 (KOEO): A/C ON during the KOEO tests.
Stored Codes (CM)
Code 29: Insufficient input from vehicle speed sensor.
Indicates the VSS signal has been low at some point during operation.
Code 33 (CM): EGR valve opening not detected.
Indicates the EGR feedback has not changed when the EGR was commanded open by the computer at some point during operation.
Fleet Owner
Joined: Oct 2005
Posts: 20,786
Likes: 1,751
From: Kentucky
A rolling idle can also be caused by a faulty TPS (even though it may not flag a code), worn throttlebody or worn throttlebody blade shaft bushings as well as previously mentioned vacuum leaks.
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