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1994.5 - 1997 7.3L Power Stroke Diesel  

check engine light?

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Old Nov 4, 2024 | 11:22 AM
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check engine light?

Just happened! First time ever had the CE some on in 28 yrs. Went to the store, everything was running just perfect. Left the store to come home started up fine and went to drive away and check engine light comes on and running very ruff. Able to limp home the 1/2 mile. Never had this issue before. Could it be the CPS ( I have one to change out) or something bigger? Oil changed every 3500 miles and just have 400 miles on current oil change. Need your advise on what to look for.. I do not have a code reader. Thanks.
 
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Old Nov 4, 2024 | 12:12 PM
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Need to know the code or we can guess expensive parts


Engine harness could have a short that shuts down one bank aka rough running, unplug the the UVCH from valve covers and check for burnt outer pins
 
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Old Nov 4, 2024 | 12:52 PM
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I changed out the CPS - no change. I'll check the UVCH for burned pins next.
 
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Old Nov 4, 2024 | 12:56 PM
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Do auto part stores lend/rent code readers?
 
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Old Nov 4, 2024 | 01:22 PM
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Auto store ones do not connect to these easily, if at all. You need to acquire this computer tool Forescan, it allows you to pull codes and read real time data for diagnostic work.
 
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Old Nov 4, 2024 | 01:26 PM
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https://www.ford-trucks.com/forums/1...2-scanner.html
If you have android
 
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Old Nov 4, 2024 | 01:30 PM
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follow up

Check UVCH plug no pins appears to be burned. See photos.
left front
left front
left rear
left rear
right front
right front


 
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Old Nov 4, 2024 | 01:35 PM
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No android / apple phone and pc.
 
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Old Nov 4, 2024 | 03:04 PM
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More questions...
Looks like I will need to take the truck my local repair shop. It that has been very reliable over the years. Once the codes are pulled I may need to R&R injectors and glow plugs since all are original with 323,000 miles on them. I have a set of Motorcraft glow plugs (ZD-10) that I bought a decade or so ago just to have for back up - are they good to use or do I need the updated version? If I drive the truck to the shop (1/4 mile) in its present condition, do I risk damaging the motor? I can have it towed.
 
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Old Nov 4, 2024 | 03:43 PM
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It looks to me that you have 3 burned pins, left rear has 1 and both right plugs have 1. Granted they are the glow plug pins, but they will eventually melt into the injector pins. The ZD10 plugs will be fine to use, and it won't hurt the engine to drive it a 1/4 mile to the shop.
 
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Old Nov 4, 2024 | 05:11 PM
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Where is the best shop to buy a new UVCH harness? Do I need the under cover set as well the top of engine plug set or is the set complete with both sides?
 
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Old Nov 4, 2024 | 05:16 PM
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Alliant sells connector repair kit for each if want into valve cover.

Most of us buy from IH/Navistar dealer or joints like Riffraff.
 
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Old Nov 4, 2024 | 05:30 PM
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Motorcraft or Navistar are probably the best valve cover gasket.. The Doorman brand are cheaper, but some have had problems out of the box with them. I have used Doorman and have gotten along all right, and they have the under valve cover harness attached to the gasket, and come with new engine side pig tails.
 
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Old Nov 6, 2024 | 05:56 PM
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Just ordered the new UVCH harnesses and new valve cover gaskets, from Riff Raff. After I finish the R&R I most likely move on the main harness.
I entered my Vin #l for the harness but when the web page loaded the harness depicted did not look to have the four plugs (2 left, 2 right)to connect to
UVCH as requiredf for my truck. Has anybody order the new (FOMOCO) harness with the 4 plug connectors from Riff Raff?
 
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Old Nov 16, 2024 | 02:27 PM
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I"ve received the UVCH harnesses and the main harness but I have a problem! I've removed all the necessary parts that are in the way of removing all the valve covers bolts except one. The left rear cover bolt is next to impossible for me to get at with any kind of wrench. I can barely get my hand in there let alone a socket and wrench. What is the trick to removing this bolt.? I can't proceed with the full replacement until I get this bolt out! Desperately need advise form the OBS gurus so I can get back out on the road.
 
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