Ford Powerstroke 94-98 7.3L Discussion of 94-98 7.3 Liter Ford Powerstroke Turbo Diesels

Miss / No power / Major Vibration

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Old 06-05-2019, 10:19 AM
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Default 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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Old 06-08-2019, 05:21 PM
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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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Old 06-08-2019, 05:24 PM
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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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