2002 F-250 check engine light
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2002 F-250 check engine light
I have a 2002 F-250 Superduty with 113,xxx miles out it. I was pulling a trailer with a pretty heavy load and all of the sudden the check engine light came on.
I pulled over and the truck had a wierd idle to it but everything under the hood looked normal.
When I got home I unhooked the trailer and hit the road again. Still the same problem. It bounces and feels like the truck is going to fall apart between 1500-1900 rpm's.
I bought a code reader and plugged it in the right way (of course) and it said no codes. The check engine light is on and no codes???? Can anyone tell me why this is and anything I might check that is causing this problem.
It is a stock F-250, 113,xxx miles, 7.3L Turbo, just had turbo rebuilt less than 500 miles ago.
Thank you
I pulled over and the truck had a wierd idle to it but everything under the hood looked normal.
When I got home I unhooked the trailer and hit the road again. Still the same problem. It bounces and feels like the truck is going to fall apart between 1500-1900 rpm's.
I bought a code reader and plugged it in the right way (of course) and it said no codes. The check engine light is on and no codes???? Can anyone tell me why this is and anything I might check that is causing this problem.
It is a stock F-250, 113,xxx miles, 7.3L Turbo, just had turbo rebuilt less than 500 miles ago.
Thank you
Fleet Owner
Joined: Jun 2004
Posts: 25,090
Likes: 1,112
From: Rio Rico, AZ.
Welcome to FTE. 
There is a lot of code readers that will not read the advanced Ford codes. A lot of those codes will turn on the light and the standard OBD scanners cannot read them.
.
With that said, from the sound of your description, and the track record of these engines, it sounds like the wiring harness under the valve cover has come unplugged.
Easy repair, but it requires pulling the valve covers.
There is a lot of code readers that will not read the advanced Ford codes. A lot of those codes will turn on the light and the standard OBD scanners cannot read them.
.
With that said, from the sound of your description, and the track record of these engines, it sounds like the wiring harness under the valve cover has come unplugged.
Easy repair, but it requires pulling the valve covers.
Post Fiend
Joined: Mar 2007
Posts: 26,966
Likes: 50
From: Texas
Do you have a chip or tuner in the truck? Just trying to rule things out. Either the Ford dealer, or an independent diesel repair shop should be able to pull the codes for you. The independent guy will probably do it quicker and for less $$$. You can buy your own code reader for about $350, or find a used superchips or edge programmer on ebay for $100 or so, so you may want to keep that in mind.
If you can catch the truck running bad when the light is on, you might be able to diagnose the loose plug Dan was referring to with an ohm meter, but usually the light stays on longer than you're describing with the loose plug. If yours is barely loose, it might not show up with the ohm meter.
If you've got time and don't want to pay for the mechanic, you could pull the valve covers and check things out visually? Let us know if you need any instructions or pictures on what to look for.
Welcome to FTE.
If you can catch the truck running bad when the light is on, you might be able to diagnose the loose plug Dan was referring to with an ohm meter, but usually the light stays on longer than you're describing with the loose plug. If yours is barely loose, it might not show up with the ohm meter.
If you've got time and don't want to pay for the mechanic, you could pull the valve covers and check things out visually? Let us know if you need any instructions or pictures on what to look for.
Welcome to FTE.
Post Fiend
Joined: Nov 2007
Posts: 9,549
Likes: 14
From: Payson, AZ
Welcome to 
You can use this guide to check Glow Plugs, Injectors or continuity to them through the UVCH.
This is how to separate the 9 pin connectors at each valve cover to get to the pins for ohm test.
Here's some info on loose UVC harness connectors with pics CLICK HERE
You can use this guide to check Glow Plugs, Injectors or continuity to them through the UVCH.
This is how to separate the 9 pin connectors at each valve cover to get to the pins for ohm test.
Here's some info on loose UVC harness connectors with pics CLICK HERE
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