Miss / No power / Major Vibration - Ford Powerstroke Diesel Forum
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post #1 of 37 Old 06-05-2019, 07:13 AM Thread Starter
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Miss / No power / Major Vibration

97 F350 7.3 Turbo XLT Dually Stock
In December of 2018 I had an original injector go out. It is stock and has 380,000 miles on it. I had enough power with 1 cylinder missing to fairly easily pull my trailer home with no vibration...
I had all 8 injectors replaced with rebuilt ones. (plus glow plugs, under valve cover gaskets, GPR, and had the oil cooler rebuilt because of a leak.)
The truck ran fine until the TRS transmission range sensor went bad – replaced it and truck ran fine until a few months ago. The CEL would randomly come on – until I shut it off – and restarted – and CEL stayed off for several runs – then came back on – and repeat above.
Then one day I drove 100 miles – shut it off for 30 minutes – and it would not start – (tach needle moved) It was almost 2 quarts low on oil and a little low on antifreeze. Checked both - - and no coolant in oil – and no oil in coolant… (added oil & antifreeze)
After letting it sit for an hour – it fired right up. On the way home the CEL came on and a “SERIOUS” vibration started – but only when accelerating.
(I thought U-joint or etc…)
Took it to shop last week and found out that 1 of the rebuilt injectors on passenger side had a bad oil o-ring – (when the motor was cold it would start and run until shut off – then – when still warm – no start until it cooled off.) (Found coolant leak = fixed - and they rebuilt oil cooler... again... because it was leaking again = no charge...)
They found 2 bad injectors on passenger side and another injector bad on drivers side – changed 3 injectors total. (out of warranty. #*#&…) they also changed all 8 of the cups.
However – even with all 8 injectors passing contribution test at the shop –

BTW – it has a new fuel pump. Fuel pressure is good.

As of right now – it idles with a slight “miss” but it’s more like a partially plugged injector – and the “SERIOUS” vibration is apparently coming from the motor and is still there when accelerating and motor has absolutely no power – acts like missing – but more like “slightly out of time” IDM signals to the injectors ????
Guys at shop say possibly a bad compression ring / bent rod – or push rod / valve / etc.??? They are not sure?????
They don’t have a way to test compression.
Would a bad IDM cause this? Or bad CPS? Or a clogged EBP tube and sensor – I believe the tube and sensor have nothing to do with the EBPV – my EBPV is disabled – but I have never cleaned / replaced the EBP tube or sensor…

I have a video of what it is doing now - but I am not allowed to post it directly here. (Watch the entire video - at the end it puffs smoke at high RPM???)
w w w . youtube.com/watch?v=t1n6gqcY7O0
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post #2 of 37 Old 06-06-2019, 03:38 AM
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Unfortunately when I read random injectors being replaced and a possible bent rod I can tell you they officially do not know what they are doing....at all.

First thing they should have told you is what the code was. Second thing was to scan it for ICP pressure and IPR %.

Based off the symptoms it sounds like the ICP going out. Pull the connector to the sensor and see if there is any oil in it. If there is oil in there then it is bad.

A CPS is roughly $30 and 10 minutes to do. That should have been the first thing to do since that can cause all kinds of funky issues.
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post #3 of 37 Old 06-07-2019, 04:17 AM Thread Starter
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Thanx for replying White95F250

When I took the truck to them it had the CEL coming on and the vibration had just begun - but it didn't seem like it was "missing".
The only code it showed was an injector not working.

I changed the ICP a month before the current symptoms began. (it did have oil in the connector...) (I thought the ICP was bad but it was the transmission range sensor causing the "loping idle" - I changed the ICP - but found it was the TRS causing that issue.)

Just bought a CPS and plan to change it out and see if that makes any difference.

I'll post back...
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post #4 of 37 Old 06-08-2019, 02:04 PM Thread Starter
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Update…

I changed the CPS (old one was Oriley Auto – worked for several years – I know – I know – OEM… the new one is also oriley’s… I know, I know…) But….
It runs better with the new Oriley CPS – but still has miss and some vibration…
BUT – it is better than before??????

The ICP was replaced a few months ago (also Oriley… I know, I know – but now there is OIL in the plug connector – again…
BUT – I unplugged the ICP and started the truck – jerky idle – straightened out – but when I put it in gear it died instantly…
I plugged the ICP back in - and it will idle and take throttle – in gear – with brakes applied – but still has the “miss”.

Cant get the EBP tube to unscrew from the exhaust manifold to check / clean / or replace it – soaking it with WD40 and ETC. until I can get the threaded end to “spin” on the tube…)

Re cleaned the FPR screen – a little dirty – but not much change after cleaning…

Fuel pressure at idle with a tire pressure gage = 30 PSI.

Below are a couple of pics of the hood and fire wall with “soot / oil – where there wasn’t any before this issue…
When the issue started – I noticed the “exhaust / or – oil” on the hood and firewall near the turbo.
Maybe a plugged catalytic converter is causing some back pressure at the turbo???
Took off the turbo hoses and only saw a few drops of oil on the blades…
But when revving up the motor – in neutral – like the video shows - it sounds like there is “back pressure” at the turbo???

I just can’t believe that a new CPS would make the difference it did with a little better power and less vibration - if it is a mechanical issue (rings / rod / valve / etc.)
Or – maybe – the other 7 cylinders “came alive” better???

I know, I know – I need a compression check………………………….

Could the IDM or the Computer possibly be the culprit?
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post #5 of 37 Old 06-08-2019, 02:16 PM
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Can you recall the exact code # when it was in the shop?

IDM can be a part of the problem. If you know someone with a known good one then you can swap it in and see how it does.

The EBP sensor won't cause the miss. It may be time to pull the valve covers and watch each injector.

I still wonder if one of the pins on the harness went out.
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post #6 of 37 Old 06-09-2019, 02:42 AM Thread Starter
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I just know the code was for an injector - and it did not pass buzz test.
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post #7 of 37 Old 06-12-2019, 03:54 AM Thread Starter
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UPDATE...

I did the "BB" mod on my FPR on the filter bowl = No Difference.

I swapped the IDM with my other truck = No Difference.

I have a new CPS (black with purple O-Ring) on order and a new Motorcraft ICP from Diesel O-Rings.

I don't believe I have a compression problem (valve / ring / push rod) - unless its a bent piston rod because I
placed the oil filler cap upside down over filler hole - revved the motor to 2500 RPM - cap did not move.

The tin nut on my IPR is tight - and from what I understand - usually when the IPR is bad - the motor won't fire or run at all - or does major hiccupping / etc.

Today I'll try unplugging each UVCH - 1 at a time and see if I can find out if it is a particular cylinder "missing".

Mine starts fairly good - and runs - has a "miss" and no power / and the vibration from the "miss".
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post #8 of 37 Old 06-15-2019, 07:17 AM Thread Starter
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UPDATE-

After unplugging the UVC harnesses - 1 at a time - I am certain the problem is on the passenger bank - one of the back 2 cylinders - I believe it is the second to the back (#5)

I ordered and installed Motorcraft (OEM) - CPS and ICP.

The miss is much better - the vibration is minimal. I now think this motor has had this issue for some time as it now runs much closer to what it had felt like for the past 80,000 miles or so - before this latest major issue.

I need to do a compression check - but first I'm going to OHM the injector wires from the IDM harness pins to the injectors and see if possibly the entire issue might be a bad wire in the harness. If it passes the OHM test - then I'll do a compression test.
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post #9 of 37 Old 06-15-2019, 07:22 AM
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Sounds like you're making progress.

I know it's a pain now but by the end of it you'll be more familiar with everything and won't need a mechanic anymore to diagnose it.
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post #10 of 37 Old 06-15-2019, 08:23 AM Thread Starter
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I hear that!

Just got a suggestion on Ford trucks site...
To swap UVCG and injector GP harnesses - to clarify (with or without OHM readings) where the problem is..
Or it may be crappy injector...
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