Hello everyone,
I'm a newbee here. This is my 1 st post...
I hope someone can solve this problem for me. I have a 95 F350 van PSD. It has 205k on the clock. It became running very rough when I was at a red light 4 days ago. I can felt the engine rocking from side to side in the cabin. It won't accelerate at all as I floor it. Now, It can barely get up to 30 mph. I've replaced the air and fuel filters I also drained the water but there wasn't any. oil change was done about 2 months ago.

I did a search and found a lot of info about the PCM problem. So I decided to give it a try and it didn't help at all. Today, I disconnected all 4 connectors on top of the valve cover one at a time while it was running. if I yank one of them on driver side and the engine will die. but either one of those connectors on the passenger side doesn't affect the engine at all.

I also find a burn 30 Amp fuse in the power distribution which is for

TFI ABS Relay,
EEC relay coil,
EEC diode diesel,
glow pluf signal

I replaced it with a new one, fired it up and it's still the same...all four cylinders on the right are not firing. The new fuse did not burn. Now, I'm lost....Where are those connectors getting their power/signal from??? It seems to me only a fuse will cut off the source to both connectors.


Thanks!

Johnny

 

Correction: It's the Cam Position sensor...not PCM. Sorry!

 

You may have some bad or broken wires under the valve cover, some melt.

 

Thanks! I took the valve cover off and there wasn't anything unusual except the fifth connection pin of the 2nd connector which goes to the glow plug of last cylinder. will that take the whole bank out??
I'll buy a new valve cover gasket and a set of wiring hardness for the last two injector tomorrow. hopefully that will do the trick.

 

Over Thanksgiving weekend. I finally had some time to check those wires and connnections from the valve cover all the way to the injection driver module. they all checked out good. so I decided to remove the injector driver module.

After I removed it I noticed a lot of sands and dirts were collected in between the IDM and the mounting surface. while cleanning it up I noticed some water coming out of three little holes vent. Each time I shacked it harder I see more water coming out of it. So, I opened it up and the whole PCB was soaking wet . I also found one of the printed circuit line at bottom was corroded. I dry it up and soldered that section back. plug it back on....and fire it up ...WOW! I got all cylinders working!!!

Dealer wants $946 for that IDM...but mine is still working fine.
My advice: Remove it and clean up the mounting surface...if possible seal that little vent completely.

Hope this will help someone in the future.


BJ

 

My truck is doing the same thing. I suspected the IDM, so I took it to the dealer. They said they thought it was the connections under the valve cover, so I checked the connections, and added the plastic shims that they make for those connectors. It was not the problem. They have the truck again. If they don't fix it, I will check the IDM as you described.
THANKS!!
Tony

 

Hey, I had the same problem with the wiring harness, where is the IDM and what does it look like? i think i need to look it over to make sure it dosnt happen again

 

Mine did this and yes the one post on your plug under the valve cover will do this. It will cause the computer to shut down that entire bank.

You will need to replace the burned harness (Ford part #F4TZ*6584*A) and perhaps the valve cover gasket (Ford part # F4TZ*9D930*K). I understand they are available from International / Navistar for less but I bought from Ford in May of 2002. While you are there I would replace both of the harnesses if you can. All you have to do is determine which bank is not firing - easy enough with a light touch to the exhaust manifold a few seconds after firing up and running on half. Don't burn your finger on the side that is firing.

What I had (and you have) is a 3.65 litre Power Stroke driving a 3.65 litre air compressor - well, not actually but it sounds good.

Dave / Believer45

 

when i was testing the motor i knew that only 4 cylinders were firing but only one of the 4 harnesses were burnt, why wouldnt 6 cyilinders run? It must be a computer thing!

 

When the PCM detects a fault under the valve cover it shuts down that entire bank. Mine failed in Chicago and my part supplier was in Cincinnati. When they shipped they forgot the second under-valve-cover harness and I replaced just one. Has been running fine since May of 2002.

Dave / Believer45

 

One way to find out which bank, all you need to do is disconnect one of the wire connectors on top of the valve covers while the engine is running. Do it one side at a time. I disconnected the last one on the driver side and it die. restarted it again, disconnected either connector on the passenger side didn't affect anything at all. that's how I found out passenger side whole bank was out.

The IDM on a van is behind the battery next to the coolant tank on the driver side. It has a big connector held by a 7/16? screw in the middle. I'm not sure it's where about on a truck...