1997 7.3 PSD Shaking at idle - VIDEO - PowerStrokeNation : Ford Powerstroke Diesel Forum
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post #1 of 11 (permalink) Old 05-12-2017, 06:41 PM Thread Starter
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1997 7.3 PSD Shaking at idle - VIDEO

My truck is shaking at idle, still noticeable when cold but gets worse once it warms up (as seen in video). Vibration goes away at higher RPM.

Video:

At Idle, you can see the RPM rhythmically goes up about 100rpm. Also the fuel pressure seems erratic to me, but maybe that's normal (?)

Things I've tried:
Pull PCM codes, there were none
New engine oil / filter
New fuel filter
New CPS (Grey from ford w/ blue Oring)
New Harmonic Balancer
Unplug icp sensor, no change.
Clean EBPS tube and sensor (truck has new pedestal w/ EBPV delete)
Injector buzz test, all 8 sound strong.
Checked resistance across injector harness pins, all were between 3.2 - 3.4 Ohms.
took serpentine belt off and ran engine, no change.

Looking for some other things to try. Thanks!
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post #2 of 11 (permalink) Old 05-12-2017, 06:53 PM
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Re: 1997 7.3 PSD Shaking at idle - VIDEO

Flywheel?

1997 CCSB, 7.3/E4OD
KC TP38R, CNC Fab Bellowed Up-Pipes, Full Force Stg 1 injectors, 3" DP, 4" exhaust, CNC Fab HPOP, Mark F E-Fuel, 7.3 Intercooler, 1.0 Exhaust Housing, TS Chip, remote coolant filter, and VB.
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post #3 of 11 (permalink) Old 05-12-2017, 07:00 PM Thread Starter
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Re: 1997 7.3 PSD Shaking at idle - VIDEO

Is there a way I could check that? I was wondering it that might be it, I've read that the dual mass flywheels can go out but thought it might be something else due to it getting worse as it warmed up.

The previous owner put a southbend clutch in, but I don't know if he installed the single mass flywheel..
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post #4 of 11 (permalink) Old 05-12-2017, 08:03 PM
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Re: 1997 7.3 PSD Shaking at idle - VIDEO

Vibration the same with the clutch pushed in as it is with the clutch let out in neutral?

1997 CCSB, 7.3/E4OD
KC TP38R, CNC Fab Bellowed Up-Pipes, Full Force Stg 1 injectors, 3" DP, 4" exhaust, CNC Fab HPOP, Mark F E-Fuel, 7.3 Intercooler, 1.0 Exhaust Housing, TS Chip, remote coolant filter, and VB.
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post #5 of 11 (permalink) Old 05-12-2017, 08:11 PM Thread Starter
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Re: 1997 7.3 PSD Shaking at idle - VIDEO

Yep, doesn't change at all with the clutch in/out.
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post #6 of 11 (permalink) Old 05-12-2017, 08:14 PM
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Re: 1997 7.3 PSD Shaking at idle - VIDEO

I have damn near the exact same problem, along with a stutter on acceleration that I think is seperate. And I've done almost everything you've done as well!


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1996 Cali F350 CCFB, 7.3 PSD, 2wd SAS, w/ 380,000 miles.
New Motor at 352,000, DieselSite Legendary Trans at 356,000 and many more
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post #7 of 11 (permalink) Old 05-12-2017, 09:07 PM
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Re: 1997 7.3 PSD Shaking at idle - VIDEO

Well then I'd do a cylinder compression check.

1997 CCSB, 7.3/E4OD
KC TP38R, CNC Fab Bellowed Up-Pipes, Full Force Stg 1 injectors, 3" DP, 4" exhaust, CNC Fab HPOP, Mark F E-Fuel, 7.3 Intercooler, 1.0 Exhaust Housing, TS Chip, remote coolant filter, and VB.
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post #8 of 11 (permalink) Old 05-12-2017, 10:33 PM Thread Starter
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Re: 1997 7.3 PSD Shaking at idle - VIDEO

Lt.Dan: Mine is pretty smooth through acceleration.

I'll have to pick up the gear to test the compression. The only test I've done is letting it warm up, put the oil cap on upside down to check for pressure.. It barely moves, there are some vapours coming out, but there doesn't seem to be much pressure in the crank case.. I would expect blow-by to be related to compression issues (?)

In any case, I will test the compression.

One odd thing I noticed with a scan tool is the Barometric pressure always shows around 60-65 kPa (9.4 psi) at sea level. When I disconnect the baro sensor it defaults to 60 kPa (should default to 100 kPa I think). Wondering if it could be a PCM issue..
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post #9 of 11 (permalink) Old 05-13-2017, 09:23 PM
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Re: 1997 7.3 PSD Shaking at idle - VIDEO

Fuel issues? Fuel pressure Regulator? Clogged screens in tank??


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post #10 of 11 (permalink) Old 05-15-2017, 06:20 AM Thread Starter
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Re: 1997 7.3 PSD Shaking at idle - VIDEO

The clutch just went out in the truck this weekend, so I'm thinking that might have been the cause. Going to pull it apart this week..
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