Fiat Ducato 2018 2.3 Engine knocking

To me that sounds like a fuel system problem, just because the engine isn't smoking doesn't rule out a fault in the fuel system.
You need to get your motorhome to a Diesel specialist.

 
I've had a word with RichP66 after I had been to a garage with a disel specialist next door I did show them the video of the engine running on my tablet as it gives a better impression they thought injectors or cam followers or lifters one explained that if you rev the engine up and switch the ignition off and the noise persist it's internal and not the injectors as as soon as the ignition is turned off the noise would stop if that helps.
 
Someone at AM is rubbing his hands in glee,,,,

get a skilled independent engineer to look at it and save a ton of money ,

from listening to your video it does not sound mechanical at all,, injectors or a fuel system issue , injectors , Throttle valve actuator , MAF sensor can make those engines run rough
 
To be honest....You need someone with a box of tricks the will give a live reading of all sensors and Injectors doing their job whilst running. Then it would be worth coming back on here and letting us all know the full out come. We can all surmise at a possibility whatever it may be. It will always be guesswork though. I know I couldn't give a definite answer for this fault honestly.
Having said that...
Im holding my Knob on a block here but.... its not the injectors of that Im sure. Worked so may times on Diesel engines of all sorts and sizes and for a knock or a rumble to be caused by a fuel system or injector failure there is always a smoking engine of sorts. The reason is purely down to either over fuelling or not enough. SO white smoke or blue black dependant on age of engine and miles done. Its not rocket science honestly. Something goes in and does not do what it should do ...it will have to be chucked out (Exhausted ) in either its partly burnt form....Blue black , or not burnt or over fuelled white (Smoke like) .
Just a thought...look at this what happened to us only recently....Absolute bugger!
Just had a garage work on my BMW X3M sport 3 litre with an intermittent fault on the engine . Bugger decided to throw a wobbly and would not start up for whatever reason? They put it on a Computer bought up some oddball error codes which threw me to be honest? They then took me for a trip whilst recording the things that popped up....Injectors came back as fine but...it actually however, told me which injector was a tad down on its pressure which was number 5 (6 in total) Just proving the system can be monitored whilst in test run procedure... I had the occasional puff of white smoke that was the indication of the fault in the fuel system. However...that was not the main problem ! It was found to be a bloody wheel sensor! Explain that one please? All the logic in the world and it come down to a wheel sensor not returning a signal when it fired up to tell the ecu or what ever, that it was ready! Replaced the wheel sensor cable and its fine!
Just trying to show you that without a proper 'Live test' being done...it could be anything or hopefully ....nothing!
I wish you well with this and hopefully it will be something seriously silly! Something that just needs a tweek or so. Then it will become a laugh in a conversation later on. I just hope its soon for you too.

Regards Kev
 
Carolyn and Kev said:
To be honest....You need someone with a box of tricks the will give a live reading of all sensors and Injectors doing their job whilst running. Then it would be worth coming back on here and letting us all know the full out come. We can all surmise at a possibility whatever it may be. It will always be guesswork though. I know I couldn't give a definite answer fortis fault honestly.
Having said that...
Im holding my Knob on a block here but.... its not the injectors of that Im sure. Worked so may times on Diesel engines of all sorts and sizes and for a knock or a rumble to be caused by a fuel system or injector failure there is always a smoking engine of sorts. The reason is purely down to either over fuelling or not enough. SO white smoke or blue black dependant on age of engine and miles done. Its not rocket science honestly. Something goes in and does not do what it should do ...it will have to be chucked out (Exhausted ) in either its partly burnt form....Blue black , or not burnt or over fuelled white (Smoke like) .
Just a thought...look at this what happened to us only recently....Absolute bugger!
Just had a garage work on my BMW X3M sport 3 litre with an intermittent fault on the engine . Bugger decided to throw a wobbly and would not start up for whatever reason? They put it on a Computer bought up some oddball error codes which threw me to be honest? They then took me for a trip whilst recording the things that popped up....Injectors came back as fine but...it actually however, told me which injector was a tad down on its pressure which was number 5 (6 in total) Just proving the system can be monitored whilst in test run procedure... I had the occasional puff of white smoke that was the indication of the fault in the fuel system. However...that was not the main problem ! It was found to be a bloody wheel sensor! Explain that one please? All the logic in the world and it come down to a wheel sensor not returning a signal when it fired up to tell the ecu or what ever, that it was ready! Replaced the wheel sensor cable and its fine!
Just trying to show you that without a proper 'Live test' being done...it could be anything or hopefully ....nothing!
I wish you well with this and hopefully it will be something seriously silly! Something that just needs a tweek or so. Then it will become a laugh in a conversation later on. I just hope its soon for you too.

Regards Kev
Click to expand...
Kev .... the problem is that AM despite being FIAT main dealer they dont seem to be able to use or read or understand their FIAT Marrelli Mathesis diagnostics computer properly ,,, You really need an expert probably an independent experienced man
 
Carolyn and Kev said:
To be honest....You need someone with a box of tricks the will give a live reading of all sensors and Injectors doing their job whilst running. Then it would be worth coming back on here and letting us all know the full out come. We can all surmise at a possibility whatever it may be. It will always be guesswork though. I know I couldn't give a definite answer for this fault honestly.
Having said that...
Im holding my Knob on a block here but.... its not the injectors of that Im sure. Worked so may times on Diesel engines of all sorts and sizes and for a knock or a rumble to be caused by a fuel system or injector failure there is always a smoking engine of sorts. The reason is purely down to either over fuelling or not enough. SO white smoke or blue black dependant on age of engine and miles done. Its not rocket science honestly. Something goes in and does not do what it should do ...it will have to be chucked out (Exhausted ) in either its partly burnt form....Blue black , or not burnt or over fuelled white (Smoke like) .
Just a thought...look at this what happened to us only recently....Absolute bugger!
Just had a garage work on my BMW X3M sport 3 litre with an intermittent fault on the engine . Bugger decided to throw a wobbly and would not start up for whatever reason? They put it on a Computer bought up some oddball error codes which threw me to be honest? They then took me for a trip whilst recording the things that popped up....Injectors came back as fine but...it actually however, told me which injector was a tad down on its pressure which was number 5 (6 in total) Just proving the system can be monitored whilst in test run procedure... I had the occasional puff of white smoke that was the indication of the fault in the fuel system. However...that was not the main problem ! It was found to be a bloody wheel sensor! Explain that one please? All the logic in the world and it come down to a wheel sensor not returning a signal when it fired up to tell the ecu or what ever, that it was ready! Replaced the wheel sensor cable and its fine!
Just trying to show you that without a proper 'Live test' being done...it could be anything or hopefully ....nothing!
I wish you well with this and hopefully it will be something seriously silly! Something that just needs a tweek or so. Then it will become a laugh in a conversation later on. I just hope its soon for you too.

Regards Kev
Click to expand...
One thing I've been thinking about is black smoke. With dpf filters designed to filter out any smoke and PM would this be evident on an engine with a dpf?

I definitely know white smoke will pass a dpf, I watched it happen when my lad drove off and the chain jumped, it was nearly at 100k!

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SVMC15 said:
One thing I've been thinking about is black smoke. With dpf filters designed to filter out any smoke and PM would this be evident on an engine with a dpf?

I definitely know white smoke will pass a dpf, I watched it happen when my lad drove off and the chain jumped, it was nearly at 100k!
Click to expand...
Im sure you have seen the odd modern motor chuffing by passing out the clouds of black smoke and asked yourself the question as too wether or not its going to blow up on his or her journey? Dpf or not...they will still puff it away when the cat clears it out even if the cat is not quite up to temperature that is.
Kev
 
jerryz said:
Kev .... the problem is that AM despite being FIAT main dealer they dont seem to be able to use or read or understand their FIAT Marrelli Mathesis diagnostics computer properly ,,, You really need an expert probably an independent experienced man
Click to expand...
Really infuriates me that! Main dealers should be up to spec with these modern motor cars, trucks or whatever! We used to pay £5k for the Machine to do the job and then £850 min yearly for its updates minimum! Even the lesser of us amoebas who used it ..still knew how to understand one! Sorry but its no excuse. Bring it away and put it some where else where they can understand the tech in front of them.
Sorry if I v'e gone off on one! Dont mean to... but... We all pay a small fortune for our motorhomes and yet we still get ripped off when it comes to maintenance! This is a 20k mileage truck that the OP owns. Its nothing on a diesel , not even run in! These are designed to go around the planet without a problem. As long has the folks looking after them of course( Garage folks!) ...can do just that! Oh struth ..Im on my way now!
Sorry Jerryz.... (y);)
 
RichP66

Just watched videos and I’m very sure that is not a “need a new engine” sound.

I think it on a single cylinder a Picoscope or similar should be able to indicate which cylinder.

It sounds better when cold so possibly just a single injector providing too much fuel. As the noise is different at different time/temps it’s far more likely it’s a sensor, or something that is variable, rather than the engine itself.
 
Perhaps blanking off each injector in turn would solve the issue, isolate them individually if the knocking persists time to look elsewhere .

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robnchris said:
Perhaps blanking off each injector in turn would solve the issue, isolate them individually if the knocking persists time to look elsewhere .
Click to expand...
Not really Folks...It does not work like that sorry. If you think of shutting down a fuel line for one cylinder it would be rather obvious to be honest. No power...obvious a lack of power etc. A live test is the way forwards for injector/cylinder testing whilst the parts are connected. After that...remove and isolate!
 
chesterfield hooligan said:
I've had a word with RichP66 after I had been to a garage with a disel specialist next door I did show them the video of the engine running on my tablet as it gives a better impression they thought injectors or cam followers or lifters one explained that if you rev the engine up and switch the ignition off and the noise persist it's internal and not the injectors as as soon as the ignition is turned off the noise would stop if that helps.
Click to expand...

Thanks for that.

Interesting info 👍
 
Carolyn and Kev said:
Not really Folks...It does not work like that sorry. If you think of shutting down a fuel line for one cylinder it would be rather obvious to be honest. No power...obvious a lack of power etc. A live test is the way forwards for injector/cylinder testing whilst the parts are connected. After that...remove and isolate!
Click to expand...
Not really interested in the power loss I'm more thinking if it was only one injector that was causing the knock then isolating it would reveal the faulty injector surely.
 
robnchris said:
Not really interested in the power loss I'm more thinking if it was only one injector that was causing the knock then isolating it would reveal the faulty injector surely.
Click to expand...
It would probably throw up all sorts of fault codes but would removing the connector from the injector stop it firing?

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SVMC15 said:
It would probably throw up all sorts of fault codes but would removing the connector from the injector stop it firing?
Click to expand...
with the injector blanked off there wouldn't be any fuel going into the cylinder.
 
robnchris said:
with the injector blanked off there wouldn't be any fuel going into the cylinder.
Click to expand...
Correct and that would show which injector is at fault, if it is an injector. Removing the connector should isolate it.
 
Just to say this is the older type of engine with a mechanical fuel injector pump, and not electronic impluse injection there are a lot less sensors unlike modern engines I still think it may be something to do with the hydraulic lifters one might have failed just my opinion not opening the valve properly then the engine wouldn't smoke but with a little less power 🤔
 
robnchris said:
with the injector blanked off there wouldn't be any fuel going into the cylinder.
Click to expand...
it is a common rail system so the pipe TO the injector would have to be sealed otherwise there will be no pressure to all the other injectors
 
It's not a common rail engine it's the old type look at the video a common rail has power to each injector this doesn't it has a mechanical pump.

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RichP66 said:
I've got some videos now of the engine knocking
View attachment 1101895
Click to expand...
Have they checked the front crankshaft pulley bolt tightness. I still think it is likely to be an injector though listening to the videos.
TT Automotive at Loughborough would be my next step. They have all the tools and knowledge to thoroughly evaluate the fueling and timing along with the skills to know what else is wrong if these aren’t the cause.
 

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