7.3 overheating

[sandcrazy]

Ok so I picked up an 01 7.3 4x4 cc dually a few months ago and I am having a few issues with it, and I am not sure which way to turn. I bought an 01 new, and I seem to remember it running better than this one, it just seems like it does not have any power at the hit of the throttle, and falls on its face when it shifts unless I am on the throttle hard. It had an edge programmer in it when I bought it, but I didnt like how hard the trans shifted, so I took it out. This is what I do know about it so far.

It has 118,231 miles on it.
The muffler and particulate filter have been removed so it is straight pipped
It has an AFE fresh air intake on it
I had the radiator checked and it flows fine.
I replaced the fan, and fan clutch, and belt with OEM Ford.
1 of the vacuum lines that go to the solenoid on the turbo pedistal is not hooked up, and is just plugged. I believe this is the one for the wastegate, but not sure.

I can drive it all day long without a load and it runs fine, but as soon as I put a heavy trailer behind it and pull a grade it starts to get warm. If I back out of the throttle and turn the heater on, I can get it to cool down rather quickly, but then I repeat the process. When I got home from my trip this weekend and went to take the trailer to storage the check engine light came on. The code came up that the exhaust pressure was high. (not egt) I cleared the code and it has yet to come back on.
I am not sure if anything in the begining of this has to do with it getting warm, but I am at a loss. Any input would be great!!

 

[fxdwgi]

I would check the exhaust back pressure valve to see if it sticking. It it supposed to operate when it is very cold out to help keep the engine warm, but I found mine was just in the way so I gutted it.

Do you hear any hissing noise coming from the motor area when driving ? When that valve closes it is very noticable.

 

[JLDickmon]

I would tend to agree on this one..
if a vacuum line is unhooked, you have to suspect the component it was hooked to

 

[dpantazis]

i'd also suggest that you check your IC and charge piping boots. if they are oil wet and leaking, then it will not build up power.

 

[sandcrazy]

I would check the exhaust back pressure valve to see if it sticking. It it supposed to operate when it is very cold out to help keep the engine warm, but I found mine was just in the way so I gutted it.

Do you hear any hissing noise coming from the motor area when driving ? When that valve closes it is very noticable.

I dont recall any strange noise other than the turbo, but I will listen tomorrow. Thanks

 

[sandcrazy]

i'd also suggest that you check your IC and charge piping boots. if they are oil wet and leaking, then it will not build up power.

Overall the boats look ok. I had the engine cleaned the day I brought it home, and they still look good after 8,000 miles.

 

[sandcrazy]

I would check the exhaust back pressure valve to see if it sticking. It it supposed to operate when it is very cold out to help keep the engine warm, but I found mine was just in the way so I gutted it.

Do you hear any hissing noise coming from the motor area when driving ? When that valve closes it is very noticable.

Just to confirm, is this the valve on the back of the turbo that has a rod on the passenger side tucked back by the firewall?

 

[sandcrazy]

As I think about things, it also pops a bit when it is reved in park maybe 2000- 2500 range. I dont know if that means anything or not, thanks

 

[BJS]

I'm thinking that your water pump may be shot turning but due to abrasion from the sand in the block casting it has made the pump less efficient?


BTW that's a shot in the dark but a real possibility.

 

[sandcrazy]

I'm thinking that your water pump may be shot turning but due to abrasion from the sand in the block casting it has made the pump less efficient?


BTW that's a shot in the dark but a real possibility.

When I did the fan clutch I spun the pump to get a feel for the bearings and it felt fine. Also typically when a water pump goes out they tend to leak out of the weep hole. Thanks for the input though. This thing is driving me nuts!!!