Low idle
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5th Wheeling
Joined: Apr 2009
Posts: 45
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From: Charlotte NC
Low idle
Hi
I have a 94 f250 with a 5.9 FI. It started idle ing very high all the time so I took off the throttle body, cleaned it really well and replaced the TPS. Now the idle runs very low. It doesn't stall but it seems it is too low. Also, it doesn't, idle high then drop down like it used to. Any ideas? Thanks for any and all help in advance.
Scott
I have a 94 f250 with a 5.9 FI. It started idle ing very high all the time so I took off the throttle body, cleaned it really well and replaced the TPS. Now the idle runs very low. It doesn't stall but it seems it is too low. Also, it doesn't, idle high then drop down like it used to. Any ideas? Thanks for any and all help in advance.
Scott
Fleet Owner
Joined: Oct 2005
Posts: 20,789
Likes: 1,753
From: Kentucky
Did you reconnect the IAC (aka IAB)?
For more info: Fuel Injection Technical Library » Idle Air Bypass (IAB)
Wider angle view of it's location:
For more info: Fuel Injection Technical Library » Idle Air Bypass (IAB)
Wider angle view of it's location:
Fleet Owner
Joined: Oct 2005
Posts: 20,789
Likes: 1,753
From: Kentucky
You could test it with a 9V battery. Momentarily touch the leads with the battery to see if it actuates. Do not hold it there very long. If the plunger does not move then you have a problem with the IAC itself, otherwise you have a wiring problem leading to it.
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