1997 Powertrain problem. - PowerStrokeNation : Ford Powerstroke Diesel Forum
 
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post #1 of 8 (permalink) Old 04-25-2018, 05:40 AM Thread Starter
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1997 Powertrain problem.

Hello all, I'm new to the forum. I've been having some problems with idle for awhile now. I was sitting outside my girlfriends house for about 10 minutes a few weeks back and noticed that I have a super rough idle, the shifter shakes about an inch back and fourth, and it's really noticeable. I also noticed that it runs perfectly smooth while cold and after about 15 minutes of idling, it starts to get rough, then maybe 10 more minutes of idling and it's at its worst idle. I did do some simple diagnostics.

187k miles.
Fuel pressure at idle: jumps, 45-60psi.
CCT: random failures every time.
Other codes: P1277
Compression test: all 8 close to 340psi
Buzz test: all sound normal. P1277
Unplugged injectors while running, all make engine run worse.

Any ideas where I should go next? I do have a computer with Ford IDS on it. If you need me to shoot some more specs, do some tests or checks, or look at some pids, let me know.

I'm leaning towards all 8 injectors. The truck was sitting for 3 years before I picked it up. I'd just hate to throw injectors in it and still have a problem. I do have a spare known good IDM that I have not installed. Let me know your thoughts, thanks in advance!
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post #2 of 8 (permalink) Old 04-25-2018, 05:48 AM
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Re: 1997 Powertrain problem.

might want to so some research on that code. Might have something to do with one of the UVCH's connections.

Shoulda bought a Cummins.

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post #3 of 8 (permalink) Old 04-25-2018, 06:19 AM Thread Starter
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I will pull the passanger side valve cover off tomorrow and just throw a UVCH at it since I have motorcraft ones laying around. I'll post back tomorrow after replacement and another CCT. Thanks for the direction!
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post #4 of 8 (permalink) Old 04-26-2018, 12:05 AM Thread Starter
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So I installed the uvch and valve cover gaskets. No change in the way it runs.
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post #5 of 8 (permalink) Old 04-26-2018, 02:22 AM
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Re: 1997 Powertrain problem.

I would say look at the engine harness to see if its rubbing anywhere or if any of the wires leading to the UVCH or at the pigtail are corroded or showing. Look for oil in the pigtail too. I believe that code is referring to an injector solenoid issue (the square things you plug the UVCH into on the injectors). And its referring to #7. You could also ohm out the solenoid through the UVCH, just gotta find which prongs in the connector are for that injector. Should read below 5 ohms.

Shoulda bought a Cummins.

1997 F250 7.3L XLT, 4x4, 5spd, 315K, TS chip, BD Turbo-Thruster II, Donaldson 6637 filter, 4" straight piped dual exit SOLD

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post #6 of 8 (permalink) Old 04-26-2018, 03:04 AM
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Re: 1997 Powertrain problem.

Attached are the pinpoint tests for P1271 thru P1278. Cheers!
Attached Files
File Type: pdf P1271-P1278 Pinpoint Tests.pdf (311.0 KB, 5 views)

97 F250 SC 4x4, E4OD, 4.10 LS, Basically Stock, Relocated Block Heater Plug, Ext Trans Filter, Tru-Cool Max, I/C Mounted but not Plumbed

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post #7 of 8 (permalink) Old 04-28-2018, 05:43 PM Thread Starter
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Quote:
Originally Posted by Cummins Junkie View Post
I would say look at the engine harness to see if its rubbing anywhere or if any of the wires leading to the UVCH or at the pigtail are corroded or showing. Look for oil in the pigtail too. I believe that code is referring to an injector solenoid issue (the square things you plug the UVCH into on the injectors). And its referring to #7. You could also ohm out the solenoid through the UVCH, just gotta find which prongs in the connector are for that injector. Should read below 5 ohms.
Quote:
Originally Posted by Patrick Feeley View Post
Attached are the pinpoint tests for P1271 thru P1278. Cheers!
Thank you for both for the info, found good ohms on cylinder 7 injector, and passed the pinpoint tests. All while cold though. I retested after a hour long drive and found cylinder 7 injector to be higher in ohms while it was hot. I picked up a spare injector from a friend and swapped out cylinder 7. The thing runs mint now, thank you!
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post #8 of 8 (permalink) Old 04-28-2018, 05:57 PM
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Re: 1997 Powertrain problem.

As I was reading your post, i was going to say you could just replace the solenoid. But looks like you already took care of it. Lol

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