Engine idle problem....
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New User
Joined: Nov 2003
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From: Philomath,OR
Engine idle problem....
I have a 1996 F150 I6 4x4 with 5spd manual trans. This is my 5th F150/F250 300 six / manual and have loved them all !! Too bad I probably won't be able to make it six since they quit making them.
Have been having a strange problem lately. It is a very intermitent problem with the engine not idling down. Not only does it want to idle at approx 1100-1200 RPM but after each shift it hangs at whatever RPM I shifted at for 5-7 seconds and then only very slowly comes down. Sometimes I can turn off the ignition and restart and this solves the problem, sometimes it takes sitting overnight. Other than that, it seems to be running very well.
Any ideas on where to start looking?
Have been having a strange problem lately. It is a very intermitent problem with the engine not idling down. Not only does it want to idle at approx 1100-1200 RPM but after each shift it hangs at whatever RPM I shifted at for 5-7 seconds and then only very slowly comes down. Sometimes I can turn off the ignition and restart and this solves the problem, sometimes it takes sitting overnight. Other than that, it seems to be running very well.
Any ideas on where to start looking?
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Joined: Jun 2003
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Yep, and welcome to FTE. Clean the IAC (INTAKE AIR CONTROL) valve. I suggest you remove it and clean the ba-jesus out of it. Carb cleaner works great. Main area is at the motor end, but clean all area's. Also replace the gasket . Let us know and good luck,
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New User
Joined: Nov 2003
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From: Philomath,OR
Thanks for the welcome luckild!
Your answer just made me think of another question.
I haven't really wrenched on cars since my '66 Fairlane GT was just a few years old! (dating myself I know) Is there a recomendation for a repair manual? I know Haines and Chilton both make one that covers my truck but are these the best option?
Thanks again.
Tcartpilot
Your answer just made me think of another question.
I haven't really wrenched on cars since my '66 Fairlane GT was just a few years old! (dating myself I know) Is there a recomendation for a repair manual? I know Haines and Chilton both make one that covers my truck but are these the best option?
Thanks again.
Tcartpilot
Senior User
Joined: Jan 2004
Posts: 161
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From: The KeyStone State
I've seen two 4.9's where the throttle body gasket actually got
sucked into the intake somewhat, causing an intake leak.
The replacements that the parts store sells are thicker and
heavier material.
Not sure if this applies to your application.
Also, some efi vehicles will experience problems when they are
lugged down below idle rpm. Like leaving it in 5th till your down
at 15 mph, then pressing the clutch.
sucked into the intake somewhat, causing an intake leak.
The replacements that the parts store sells are thicker and
heavier material.
Not sure if this applies to your application.
Also, some efi vehicles will experience problems when they are
lugged down below idle rpm. Like leaving it in 5th till your down
at 15 mph, then pressing the clutch.
