I've got a 95 7.3L PSD, and I have having what appears to be turbo related problems.

So far I have disconnected the EBV valve, and by looking at the actuator arm, it appears to be open. I also installed, the EBS eliminator and EVB terminator electrical connection by DFUSER. I checked the OBDII codes with a hand held scanner that I have and it says 'No Codes." I also took the air hoses off of the turbo and checked them. All couplings looked good. Also could spin the turbo with my finger.

When I start the truck up, and drive it the turbo doesn't spool. Going up a decent grade 30mph is a fast as it will go. The odd thing is that after driving it for about 20 min, its start to run fine. Turbo spools up, and it runs just as fast as you want to go. I have duplicated this 3 times in a row, so I don't think it is coincidence. Also it's not a cold weather related problem. Outdoor temps are 80-90 degrees right now. One would think this is the EBV, but again, it is disconnected. The actuator arm is still connected, and it does not move. So I have no reason not to believe that is is not staying in the open position.

Any advice on where to look would be greatly appreciated. Thanks

 

Could be bad injectors.

 

When its cold and you think the turbo isn't spooling is it blowing black smoke?

 

i had the exact same issue. i had the occasional No Turbo spin and power loss. especially right after starting it in the morning. No Codes on A&E.
somebody else had that issue and recommended changing the ICP Sensor. I broke down and bought a cheap sensor of eBay , to see if it makes a difference...my problem was gone :-)

 

I don't think it is blowing black smoke, but to be honest I haven't specifically looked for it. I'll try to check that when I get a chance.

 

Thanks! I was starting to suspect the ICP Sensor (Just from what i have read), but wasn't sure. I'll give this a try.

 

It would be cool to hear what you learn. If the ICP sensor doesn't solve it, I wonder if it could be a plugged exhaust or catalytic converter.

 

FWIW, Ive noticed my truck does not want to spool at all when cold.. but once warmed up shes ready to pull like a train. Im curious if a new ICP sensor solves your problem.

 

Whenever I find the problem, I will post it here. I haven't had time to look at it much the last 2-3 days. This truck is not a daily driver, so it's not a huge rush to get it fixed. I did pull the electrical connectors at the valve covers to check for damage, but they look brand new. These were actually replaced a few years ago. I did order a new ICP sensor, and will try that in the next few days.

 

Had some time to work on this truck this evening. I had ordered a copy of Autoenginuity and received it yesterday from rifraff diesel. And yes, it will work on a '95 as long as you set the connection protocol to J1850 PWM and Non-OBDII compliant. I believe my truck had the ODBII port live from the factory as it is the only one that I found. I did not find the OBD I port under the hood.

So, I hooked it up. I ran a buzz test on the injectors. All of them sounded good to me. I then started up and added the ICP sensor MAP sensor and some others to the live data. I noticed the ICP was showing 580 to 600 psi. I unplugged it and it went to 700psi. So, I though maybe it was reading low. I had a new one and changed it, but the new one was reading the same values. I then noticed the MAP sensor, it was stuck on 10.1. I knew that it should be around 14 based on other posts that I had read. When I pushed the throttle the number would not change. I unplugged the MAP sensor. The CEL came on, but the MAP value on AE went to 14.9, and when I gave it the fuel it would increase. I took it for a drive and it ran great. I stopped beside the road, and plugged the MAP sensor back in and it was working, and ran great all the way home. When I got home, I took some de-oxit and cleaned the the electrical connectors, I also took the air line loose to make sure it was in good shape, but no problems were found.

I let the truck sit for 30 to 45 minutes, and took it for another drive, map sensor plugged in, and I got good numbers on AE and it ran great. I laid one heck of a black line when pulling out of a secondary road.

So, it's looking like my problem may have been a marginal/ corroded electrical connection on my MAP sensor.

 

Glad you got it!

 

I thought I would update. I ended up replacing my MAP sensor. The original kept giving me problems. Best price I found was RIffRaff for a Motorcraft.

 

^^^^ Good choice; sensors like MAP, EOT, ICP, CPS should be OEM, either Motorcraft or IH. And that kind of troubleshooting makes AE worth every dime.