7.3 specialists...
Hotshot
Joined: Jan 2011
Posts: 18,849
Likes: 179
From: Puget Sound
That depends on which direction it fails:
If it reads artificially high, the PCM will try to lower your ICP. With low ICP and the PCM thinking it's normal, you have anemic performance - very anemic. In my case, I could drive highway speeds just fine, but acceleration and hill-climbing was pathetic. It will also run unusually quiet.
If it reads artificially low, the PCM will jack up your ICP. This adds more fuel than the PCM expects, so the engine will be jerky, smoky, loud, and the EGTs will be scary.
If it reads artificially high, the PCM will try to lower your ICP. With low ICP and the PCM thinking it's normal, you have anemic performance - very anemic. In my case, I could drive highway speeds just fine, but acceleration and hill-climbing was pathetic. It will also run unusually quiet.
If it reads artificially low, the PCM will jack up your ICP. This adds more fuel than the PCM expects, so the engine will be jerky, smoky, loud, and the EGTs will be scary.
Lead Driver
Joined: Jun 2003
Posts: 8,298
Likes: 25
From: Damon (South East Texas)
Hotshot
Joined: Jan 2011
Posts: 18,849
Likes: 179
From: Puget Sound
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Elder User
Joined: Dec 2006
Posts: 718
Likes: 2
From: Chattanooga, TN
Tugly,
That was my experience when starting on a round-robin trip from E. TN to TX and back. I had an oily coating on top of the sensor and remember reading that if disconnected it ran it would be fine as long as I was not towing. I disconnected the sensor and continued my trip and replaced it upon my return. All was well.
That was my experience when starting on a round-robin trip from E. TN to TX and back. I had an oily coating on top of the sensor and remember reading that if disconnected it ran it would be fine as long as I was not towing. I disconnected the sensor and continued my trip and replaced it upon my return. All was well.
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Lead Driver
Joined: Jun 2003
Posts: 8,298
Likes: 25
From: Damon (South East Texas)
I thought about doing the same thing, but I have a spare vehicle to drive. I'm giving Red a rest 'til the new sensor shows up on Monday.
More Turbo
Joined: Mar 2006
Posts: 582
Likes: 2
From: Eads, TN
I just replaced mine yesterday.
https://www.ford-trucks.com/forums/1...ine-light.html
My truck continually got worse regarding symptoms. Eventually, it would die while stopped in traffic or going slow making a turn. Very dangerous!
https://www.ford-trucks.com/forums/1...ine-light.html
My truck continually got worse regarding symptoms. Eventually, it would die while stopped in traffic or going slow making a turn. Very dangerous!
Thread Starter
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Tuned
Joined: Sep 2013
Posts: 257
Likes: 0
From: Altoona, PA
Please take a look at this video. This has been a problem for a while. It only does it in the certain throttle position/rpm window. It never does it from a cold start. Only once it is warmed up. It does not always do this but more times than not it will.
if I push the go pedal it stops bouncing/surging/whatever...if I let off the fuel pedal and reduce rpm the surging bouncing etc goes away. It also at times acts like only some of the 8 cylinders are firing. (it gets quiet) Again though if I let off or push more pedal it goes away and runs normal and strong. Idle is good...with a very faint hiccup once in a while.
Hopefully you can hear my video enough to make some light of it...
thanks
if I push the go pedal it stops bouncing/surging/whatever...if I let off the fuel pedal and reduce rpm the surging bouncing etc goes away. It also at times acts like only some of the 8 cylinders are firing. (it gets quiet) Again though if I let off or push more pedal it goes away and runs normal and strong. Idle is good...with a very faint hiccup once in a while.
Hopefully you can hear my video enough to make some light of it...
thanks
Post Fiend
Joined: May 2009
Posts: 5,470
Likes: 3
From: Pea Ridge, AR
Works now, very interesting that you aren't getting an SES light...does your light come on at KOEO test?
Have you tried this with the ICP unplugged to see if it will do it under the same conditions? Also made sure the Tin Nut is on the IPR?
Do you have a way to monitor live data? Curious about the Pedal position sensor as well.
Have you tried this with the ICP unplugged to see if it will do it under the same conditions? Also made sure the Tin Nut is on the IPR?
Do you have a way to monitor live data? Curious about the Pedal position sensor as well.