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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

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  #46  
Old 05-10-2013, 07:00 PM
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Quote:
Originally Posted by FORDF250HDXLT View Post
sub,we don't have a computer controlled engine (7.3l idi) however the older OBD1 code reader pulls the codes from our devoted E40D ECM.
all idi owners with the E40D should start with making sure they have this low cost device in the tool chest anyway.regardless if the OD light is even blinking yet.so even if he buys the 20-30 scanner and it doesn't give him a VSS code,well he's not out anything.he's got it for next time lol.
I'm open to any and all suggestions. Your knowledge supercede's mine 10 fold.
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  #47  
Old 05-10-2013, 07:05 PM
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After looking at it yes you do use the PSOM to send information to the PCM Computer and i think a code reader will work on your truck.

But it still sounds like a poor body ground to me.
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  #48  
Old 05-10-2013, 07:11 PM
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Quote:
Originally Posted by FORDF250HDXLT View Post
sub,we don't have a computer controlled engine (7.3l idi) however the older OBD1 code reader pulls the codes from our devoted E40D ECM.
all idi owners with the E40D should start with making sure they have this low cost device in the tool chest anyway.regardless if the OD light is even blinking yet.so even if he buys the 20-30 scanner and it doesn't give him a VSS code,well he's not out anything.he's got it for next time lol.
Oh I think he will get the VSS code with the code reader. But I think it is because he is losing ground to the body.
When he loses ground the PSOM stops working and the PCM will give the VSS code.
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  #49  
Old 05-10-2013, 07:18 PM
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Originally Posted by subford View Post
After looking at it yes you do use the PSOM to send information to the PCM Computer and i think a code reader will work on your truck.

But it still sounds like a poor body ground to me.
I just went out and looked at the negative terminals and cables. They are pinkie thick wires. The passenger battery has exposed cable at the terminal but doesnt look terrible and following it looks like it goes to the Crank/Starter?? The driver side looks like its securely mounted to the engine block on the bottom just next to a removable pan.
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  #50  
Old 05-10-2013, 07:30 PM
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Upon further inspection of the cables they do seem to be secured to the block and bolted tightly, however, the driver side cable at the connection point to the block has power steering fluid leaking onto it. I didn't think this would cause an issue but like I said, I don't understand much about electrical current and how it works.
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  #51  
Old 05-10-2013, 07:56 PM
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I will go ahead and grab an OBD1 scanner along with the VSS tomorrow and see if that fixes it. Obviously I'm having trouble with my temp and oil pressure gauges so I will look into that also (wiring issues, cluster, etc). If you guys come up with anything else I should try please let me know. Thanks for the help thus far. I will post my findings tomorrow considering I get what I need and all goes as planned.
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  #52  
Old 05-10-2013, 08:13 PM
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You talked about the large cables coming off the NEG post but you did not say anything about the body grounds and I think that is your problem or lack of them.
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  #53  
Old 05-10-2013, 08:22 PM
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The below diagram shows the body grounds from each NEG post.
Click the image to open in full size.



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  #54  
Old 05-10-2013, 09:33 PM
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I just looked at the cables again, sorry, I looked passed the ground wire....

Passenger side battery has multiple wires coming off of the positive terminal (some go to what looks like a relay on the passenger fender). From the negative terminal there's just one fat cable going down to the passenger side of motor.

Driver side battery has multiple wires on positive terminal. From the negative terminal there's a fat cable going down to the driver side of motor but also has a ground wire bolted to the metal of the engine bay just in front of the battery.

I can check connection of all the points tomorrow in the daylight.
Should I add a ground to the passenger battery? Is the diagram just showing 1 ground from passenger battery or 2?
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  #55  
Old 05-11-2013, 07:06 AM
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It is showing two body grounds on the left (drivers) side G108 and one body ground on the right (passenger) side G101.
Click the image to open in full size.
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  #56  
Old 05-11-2013, 07:12 AM
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Quote:
Originally Posted by Mighty_Sasquatch View Post
Passenger side battery has multiple wires coming off of the positive terminal (some go to what looks like a relay on the passenger fender). From the negative terminal there's just one fat cable going down to the passenger side of motor.
The passenger side grounds G101 should look something like the photo below.
The photo is of a gas truck but this point should look the same.

Click the image to open in full size.

Also check the grounds in the cab for the cluster, G200 & G201.

G200:
Click the image to open in full size.

G201:
Click the image to open in full size.
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  #57  
Old 05-11-2013, 11:26 AM
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do you happen to have have pic 1 of 2 also sub? those are handy.
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  #58  
Old 05-11-2013, 12:19 PM
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Quote:
Originally Posted by FORDF250HDXLT View Post
do you happen to have have pic 1 of 2 also sub? those are handy.
Yes but I may not leave the image link up for very long.
I hope this is what you were asking for.

Click the image to open in full size.
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  #59  
Old 05-11-2013, 12:47 PM
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Thanks for the pics and diagrams. Helping immensely. I did some wiring recon and I've found some pretty terrible stuff. Drivers side kick panel has the ground in place just fine but... There's a huge rats nest of aftermarket alarm wiring (not functional) and a whole lot more I haven't traced yet. Passenger kick panel has ground in place also but found out windshield is leaking allowing water to get on those connection points just above the ground. Also the previous owner wired lights under the chassis tapping into the harness running along driver frame rail. These lights were busted, exposed, connections loose and all around terrible. I can see someone tapped into that same harness closer to the rear end for the trailer lights. Also exposed and ugly. Still have to repair that setup along with whatever is going on under the driver kick panel then I'll install the grounds for the passenger battery.
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  #60  
Old 05-11-2013, 03:25 PM
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Ok, so I yanked out all the old alarm wiring, disconnected the rigged up undercarriage lights and got it all back to stock. I also added a ground to the passenger battery using a thick amp wire. Once all was completed I took it for a test drive and Holy Crap it shifted amazingly! The smoothest I've ever felt it shift! Then...... 15 min into the drive wouldn't ya know it, the trans started clutching itself and slamming back together.

Oil pressure gauge moves on ignition but not seeing any change while driving. Temp gauge still not moving at all.

What next... VSS?
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Old 05-11-2013, 03:25 PM
 
 
 
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