Hi People
I am having one of those weeks, I am in real need of some help from you techs out there. I am an ex-ford tech eeciv, eecv certified and powerstroke (dealer) trained, I am more experienced with the 7.3 but find my way around the newer models just fine. I am seriously busting a nut figuring out this one and would humbly ask help with this…truck
2004 E450 Cube 6.0 Powerstroke Torqueshift. 90000km.
Situation as followed
Truck came in with a “no reverse” complaint, I questioned the driver and confirmed a long engagement, 10 minutes of warm up before it goes into reverse. I asked to keep the truck outside overnight and I was there early in the AM to check it.
The truck fired right up (-12 C ) with a very small shake to the motor. Minor miss. I noticed the speedo in PARK was floating between 20km and 80km and confirmed a dead fuel pedal, absolutely no response. I put it in reverse and absolutely no engagement, I put it in drive and no response, not even an effort. Codes as follows : P0715 input sensor, P0720 output sensor, P0791 intermediate sensor, P0272 #4, P0341 cam sensor, P0404 EGR. While it was warming up I did confirm the scanner reading at the VSS matched the cluster @80km, at this point I thought it was a harness problem so I did not go farther with the data stream, wish I would of checked the output, inter, and input sensors…
After letting it idle to worm up, I shut down the motor and fired it back up, everything went back to normal (still a little long gear engagement but acceptable). I figured no big deal and gave it a once over in the shop. This what I thought, and way too many hours later this is what was done
-Batteries checked but replaced the terminals at the batteries heavy corrosion, cleaned every ground (at motor also). Corrosion was everywhere, worst one I’ve seen (battery terminals).
-Opened the trans harness and went wire by wire, checks good, later both harnesses to the trans was change because when I took the harness apart the wires were cooked together and although not skinned I was loosing 3 volts between ECM and trans.
-Wiggled the main harness, no change, later me and my co-worker spent 6 hours disassembling the main harness, inch by inch. I took extra care to inspect the sore spots, EGR cooler bolt, FICM connectors and harness area, block heater area, drivers v/c area, and behind HPOP. Found 2 wires at ECM harness that chafed thru at wiper cowl (econoline) and a 12 volt power source wire chafed at the map sensor mount bolt.
-Removed the FICM, checked the connectors and harness (FICM is new).
-Full service trans, two filters, and 20 litres Ford SP
-Checked alternator diodes (I’m thinking RF static)
This is a compressed explanation, because the problem is intermittent, the repairs happened over days and I did so many test I can’t remember them all. At the first visit I cleared the codes and nothing has come back since although the problem showed up multiple times (cleared before above work). These are the symptoms that are throwing me off :
-I managed once to catch the intermittent problem in action, this is what I did, I cut the OSS wire at the ecm while running, speedo stayed up, scanner still corresponded with speedo.
-I pinned the throttle to the floor (no action) and waited for the “CE” light, it didn’t come on. If its in limp mode why does it not thro a code?
-Next when its back to life a can manage, up a hill, under heavy load, get the trans to slip, at one point I let it slip really long, pulled over and still no codes, not even a slip code? As we speak the trans is a strait ass no go, forward or reverse
I understand that I probably have two issues here, one in the transmission and one somewhere else (motor drivability) I am aware of the trans solenoids problems but I would really like to fix the electrical gremlins first, as the way I see it, if there is damage in the transmission it came from the other symptoms. Unfortunately I did not get the chance to read the data stream, accelerator pid, nor the 3 speed sensor on the trans when the problem was happening. I did get a chance to unplug the trans harness again when the speedo was moving with no change (after above work). I did some research, I have found issues concerning the ABS module, pedal, and cluster but nothing all at the same time.. Does anybody have experience with these components giving troubles like mine? I really need to stress the fact that Speedo, pedal, and trans all happen at the same time, and all symptoms goes away together except for my possible damaged trans. Yesterday I had the truck for the day, hooked all my scanner equipment and scopes on the trans sensors, and Vref. before firing up the truck and of course it didn’t show his ugly face, that’s when I decided to work on the main harness, everything was spot on till the customer showed up at 5:30pm to pick it up. Same problem…I was pissed and just went home.
I hope my explanation is clear enough, and that I didn’t forget to mention anything, I have a headache. So to recap
Intermittent – no forward, no reverse, speedo erratic, dead accel pedal, all at the same time.
No Codes (I finally got a OSS code and a slip code at the very end)
Transmission slips
Truck starts fine even at -12c unplugged
PS... I put the ECM and FICM in the freezer, cannot duplicate malfunction (happens more cold)
I checked trans pressures and all is fine (problem not present of course)
Please if anybody worked on a problem like this if you could be so kind and give me a heads-up, it would be much appreciated, before I blow a gasket.
Sincerely
Frank