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idi injection pump

1987 - 1996 F150 & Larger F-Series Trucks 1987 - 1996 Ford F-150, F-250, F-350 and larger pickups - including the 1997 heavy-duty F250/F350+ trucks

idi injection pump

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Old

Sep 25, 2016 | 06:15 PM

#16

madpogue

Lead Driver

Joined: Oct 2003

Posts: 8,476

Likes: 37

From: Madison, WI

Quote:

Originally Posted by Cruiseomatic

I've heard of that before but can't remember right now what it is, can you please refresh my memory?

It's a switch on the pedal. Closes as you first move the pedal (similar to a brake light switch). The PCM has to see a sequence of open, then closed, before it will fuel the engine above idle. So even if the rheostat were saying "full throttle", when you take your foot off the pedal, the idle switch opens and the PCM says "sorry, I'm going to idle".

The "open-to-closed" sequence is another failsafe. It's in case you start the engine and for some reason the pedal is stuck down (think final scene of "The Blues Brothers"), the engine won't run to redline.

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Old

Sep 25, 2016 | 08:10 PM

#17

'89F2urd

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Joined: May 2011

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Hence...dead pedal.

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Old

Sep 25, 2016 | 08:14 PM

#18

Cruiseomatic

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Joined: Nov 2003

Posts: 1,858

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From: Dark side of the sun.

Cool thanks.

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Old

Sep 25, 2016 | 08:19 PM

#19

madpogue

Lead Driver

Joined: Oct 2003

Posts: 8,476

Likes: 37

From: Madison, WI

Quote:

Originally Posted by '89F2urd

Hence...dead pedal.

Yup, common symptom of the switch not closing early enough.

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