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7.3 Throttle Response Problems

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  #31  
Old 10-11-2013, 02:42 PM
corpuspits corpuspits is offline
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me to fuse blew ..bad spot to be broke down ..$300 tow ...weird thing is it hasnt blown it again and hate to go out of town in it.226,000mls on her
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  #32  
Old 10-16-2013, 12:30 PM
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20 min & some electrical tape to fix :-roll

Solved!

Found the short. When my dog was a puppy - he chewed the shifter handle while I was out of the truck looking for a trailer. (I was proud of him for resisting the paper bag of french fries sitting on the dash....) - fast forward to a few years later, and the shift handle finally came apart at the seams. It worked, it's just ugly - but allowed enough movement to chaff the small wires inside the shift handle. A dab of liquid electrical tape on the wire itself, and about 3 ft of electrical tape wrapped around the handle have it working until a $65 replacement handle arrives in the mail.

Edit: This also fixed my unusual problems with throttle response under hard cornering and hard acceleration.

Super easy fix now that I know where to look.

If your dog didn't chew the handle like mine - open it up and check the wires in the column where you'll most likely find the short. If you get in a bind - you can just unplug the connector inside the column for the over-drive button, pop a new fuse in and drive the truck as long as you want... just without the convenience of the overdrive button.

Here is an excellent write up from Ken on another forum. This write up had me in and out with a completed repair in under 20 min.

https://docs.google.com/a/doublermfg...M2Q5YjdmODQ4NQ
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  #33  
Old 07-21-2015, 01:36 PM
squirtbranson squirtbranson is offline
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My 7.3 has no lights on when my peel goes dead and when it is working it seems like it didn't have the quick response it did before that problem started
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  #34  
Old 08-13-2015, 08:37 PM
Kzneft Kzneft is offline
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Hopefully someone can lead me to the right direction. 1999 F350 7.3. No throttle response. Would run well, then SES light comes on and no throttle, then it would go off and I can drive. Purchased a new TPS and replaced it. Checked the IVS with a ohm meter and its good and not sticking. The overdrive light comes on. I even put the old TPS back on and still no throttle. All fuses are good. Not sure what to try next.
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  #35  
Old 10-31-2015, 04:37 PM
jamesabner jamesabner is offline
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7.3 no codes...

My 7.3 Idles only...post no codes,but speedo is not working and wont start with the key. the overdrive button is flashing and the abs light is on. these problems have to be related...ugh
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  #36  
Old 10-31-2015, 05:13 PM
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James,

Ummmm, year, model, truck or Excursion.....

Details needed to assist.

Did you read the rest of this thread? There's lots of good info in there.

Pop
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  #37  
Old 11-01-2015, 09:07 PM
Kzneft Kzneft is offline
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Fixed my 1999 F350 SD 7.3
It was the IPS (Idle position sensor) under the throttle pedal. Instead of paying $400 plus for a whole assembly I purchased the existing micro switch that was there already from one from Ebay. About $10 for two of them. Re-soldered the connections and now works great. I originally replaced the throttle position sensor. No one carries these so I purchased one from Amazon. Its a motorcraft DY967 that is supposed to work but when I installed it on my truck it did not. Maybe it was faulty but the ohms when I checked it were not even close to the one I had on my truck that was still working. Put the old one back with the new macro switch and now runs great. I think the DY967 is for a F350 SD but with a gas engine. Still trying to find one that fits so I have a spare if my original one goes out.
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  #38  
Old 11-01-2015, 10:07 PM
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Quote:
Originally Posted by Kzneft View Post
Fixed my 1999 F350 SD 7.3
It was the IPS (Idle position sensor) under the throttle pedal. Instead of paying $400 plus for a whole assembly I purchased the existing micro switch that was there already from one from Ebay. About $10 for two of them. Re-soldered the connections and now works great. I originally replaced the throttle position sensor. No one carries these so I purchased one from Amazon. Its a motorcraft DY967 that is supposed to work but when I installed it on my truck it did not. Maybe it was faulty but the ohms when I checked it were not even close to the one I had on my truck that was still working. Put the old one back with the new macro switch and now runs great. I think the DY967 is for a F350 SD but with a gas engine. Still trying to find one that fits so I have a spare if my original one goes out.
These trucks do not have a TPS. That's why you can't find one. You need to look for an Accelerator Pedal Position Sensor. There is a Dorman part# available (699-200 I think) at most parts stores and Rock Auto.

Also, the other switch is an IVS ( Idle Validation Switch).
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  #39  
Old 11-02-2015, 07:06 AM
jamesabner jamesabner is offline
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I need to spend some time learning the system...

I have a 1996 f250 4x4 7.3 diesel.
I really like this truck. It has had a faulty speedo since I bought it. I have replaced the sensor on the rear end and pulled the cluster,checked for burnt traces and cleaned/replaced bad bulbs and reinstalled.
Still no speed ometer. Thus eratic shifting and very hard shifting.
Somehow during these repairs, I lost my accelerator pedal.
From reading various posts here I am going to search for a used pedal assembly.
I know just enough to get me into trouble...but the pedal went out while I was repairing the dash. I am assuming I have computer or ecm troulbles.
I have a mac ET 1205AN scanner. it pulls NO codes. If the engine is running during the scanning process...the scanner causes it to miss eraticly then die.
Any ideas would be appreciated...
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  #40  
Old 11-02-2015, 07:42 AM
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Probably should move to the OTHER 7.3 forum......94.5-97.......and it is probably not compatible with your Mac Scanner.....
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  #41  
Old 11-02-2015, 09:11 AM
jamesabner jamesabner is offline
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Thank you, I will check it out
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  #42  
Old 11-02-2015, 10:53 AM
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As mentioned, that throttle switch is usually called the Idle Validation Switch (IVS).

Dust and dirt accumulate, causing it to not work.

Sometimes just blowing it out with compressed air restores its operation for a few more years.

Pop
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  #43  
Old 11-02-2015, 08:55 PM
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Yes, you are correct. Idle Validation switch. Got typing to fast and had a brain cramp.
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