'97 F350 7.3 Running Strange? - Ford Powerstroke Diesel Forum
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Old 12-03-2012, 09:14 PM
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'97 F350 7.3 Running Strange?

For those of you that saw my previous thread I did follow through and trade my 99 F250 SD 7.3l for a 97 OBS F350 7.3l crew cab dually.

I started her up today and it "romped" a few times. I got some white smoke, it was around 50 degrees outside. The white smoke cleared up a little after a short drive, but I could still see a bit of haze coming from the exhaust.

Truck sounds like it is running good after the romping stops, and it drives smooth until 3rd and 4th gear come around. In 3rd gear the truck seems to shutter a little bit, it seems to get worse with a load. This "shutter" isn't bad but it is noticeable.
Transmission doesn't seem to be slipping at all but it does shift a little hard from 1st to 2nd and sometimes to 3rd.

What is going on?

Last edited by Pwnm30rdi3; 12-03-2012 at 09:52 PM.
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Old 12-03-2012, 09:17 PM
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you didnt test drive it first? is your ebpv sticking?just spit ballin here, good luck bro
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Old 12-03-2012, 09:30 PM
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Quote:
Originally Posted by 351fifty View Post
you didnt test drive it first? is your ebpv sticking?just spit ballin here, good luck bro
He drove 45 minutes to me and the truck was warm so the white smoke wasn't noticeable to me in broad daylight. Then I got it home and let it sit.
I test drove it twice and didn't notice the shuttering, should have taken it on a longer test drive.

If the EBPV was stuck shut, it would sound different. Correct?
If I unplug the EBPV will it stay closed?

Thanks for the help, hope i didn't get boned on this trade.

Last edited by Pwnm30rdi3; 12-03-2012 at 09:48 PM.
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Old 12-03-2012, 09:35 PM
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if you unplug it and it is closed it will stay closed, does it have a stock DP?
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Old 12-03-2012, 09:39 PM
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Quote:
Originally Posted by 351fifty View Post
if you unplug it and it is closed it will stay closed, does it have a stock DP?
Downpipe was just replaced 2-3 weeks ago. 4" DP to 5" exhaust.
There is a switch under the dash, not sure what it goes to...
Has a ****ty Max Micro Programmer or something was planning to go back to a PHP chip...

Edit: Switch under dash is not hooked to anything.

Last edited by Pwnm30rdi3; 12-03-2012 at 09:47 PM.
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Old 12-03-2012, 11:36 PM
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kind of a pointless switch lol, pop the down pipe off the turbo and check the ebpv, you should be able to move it if you can reach in there, but is it throwing any codes?
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Old 12-03-2012, 11:39 PM
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Originally Posted by 351fifty View Post
kind of a pointless switch lol, pop the down pipe off the turbo and check the ebpv, you should be able to move it if you can reach in there, but is it throwing any codes?
Very pointless switch.. lol
I will check for codes tomorrow and then pop off the down pipe to look at the ebpv. Should be a fun job! Haha

Any other things I can check for besides the ebpv?
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Old 12-04-2012, 02:11 AM
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If it's a 1997, you could also have the infamous NAW6 pcm code. They shift terribly and have weird TC lockup.
Aside from that, shudder in 3rd also makes me think possible torque converter issue. Torque converter will generally be unlocked until 3rd, or whenever you reach roughly 35mph. What does your trans fluid look like? The fact that you have a ghost switch under the dash makes me think he possible had it wired up to remotely lock/unlock the T.C.
Any way to data log the truck and see what's going on in the transmission at shift points?
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Old 12-04-2012, 07:39 AM
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Originally Posted by backwoodsboy View Post
If it's a 1997, you could also have the infamous NAW6 pcm code. They shift terribly and have weird TC lockup.
Aside from that, shudder in 3rd also makes me think possible torque converter issue. Torque converter will generally be unlocked until 3rd, or whenever you reach roughly 35mph. What does your trans fluid look like? The fact that you have a ghost switch under the dash makes me think he possible had it wired up to remotely lock/unlock the T.C.
Any way to data log the truck and see what's going on in the transmission at shift points?
Going to check codes in an hour or two, will let you guys know if anything comes back.
I will also check the PCM...
The ghost switch had two wires running all the way to the front of the truck. (Wires were cut at the grill)
I'll post pics of the trans fluid. I don't have a way to log the data to see whats going on with the trans.

Last edited by Pwnm30rdi3; 12-04-2012 at 07:46 AM.
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Old 12-04-2012, 09:20 AM
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Went to Autozone to have them check for any codes.
Their OBD reader said "please turn ignition key on" even though my ignition was on, she told me that it had no codes and to have a nice day.
Is my OBD port not working?

Napa Service quoted me at $20 to have the truck checked for codes. Wish i had an OBD reader right now..

PCM Code is TDE0.

I went out to do a cold start this morning. Truck was not plugged in and it was 40* outside. Truck started without a problem and there was no romping.
But, once i turned the truck off and restarted it while it was warm, the romping at idle was back.

If truck is cold = no romping on start
Truck is warm = romping on start

Since it is colder today, the white smoke at idle is much more noticeable...
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