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[Engine] Sudden engine knock, and management light on
#1
Hi

First time on here. I drive a Berlingo 1.9D 2006 van. It has never missed a beat in 4 years I have
been driving it. However, yesterday I started it and drove 2 miles. Then, suddenly I got an instant 
loud engine knock, and the management light stayed on. If you switch off, then start it up again,
still the same. It wasn't gradual, it just came from nowhere.

Any ideas?

Thanks
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#2
No way of knowing unless you get it scanned for fault codes. The EML is used for hundreds of different faults.
My (not a) Citroen:  
MK7 Ford Fiesta ST180 in Frozen White  Cool

           2-B
-----+----[  ]---+----------( ? )----
      |              |
      |     2-B   |
      +----[/]---+
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#3
(07-08-2020, 07:37 PM)Zion Wrote:  No way of knowing unless you get it scanned for fault codes. The EML is used for hundreds of different faults.

Thanks for your reply Zion.

I got it checked for codes but nothing comes up at all. What do you think about this....
Now the noise goes, and the management light goes out. Then the light comes on, and the
noise returns?

I had an alternator make the same noise last year, but the light didn't come on. Think the guy
I used fitted a cheap one, and maybe it's gone again!

Can the light come on if the alternator is faulty?

Thanks.
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#4
I cant see the alternator banging and it would be the ignition light that would come on for a faulty alternator.

A faulty injector can make a loud noise as if the con rod is about to come through the crankcase.
If faulty the metal fuel pipe that feeds the injector gets very hot.

Also bad injection timing can also cause loud noises, but doesn't usually cure its self unless the
crank sensor (?) is giving an erratic signal.
2010 B9 red XTR w a v. 
2001 1.9d DW8B white  Berlingo  
2005 2.l green Berlingo
2001 1.9d DW8B white  Berlingo 
berlingo 1.4 red multispace
1993 xud 1.9 red partner
[-] The following 1 user says Thank You to brodfather11 for this post:
  • trebor
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#5
Thanks brodfather11.

So, if the problem was an injector - would the EML, and noise come and go?
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#6
The battery light would usually come on or flash, if the alternator wasn't charging the battery properly. I can't think of a situation where it would make the engine knock, is this a one time "clonk" then the management light (EML) comes on, or a continuous noise while the light is on?

I can imagine an injector failing, causing a different combustion sound and that may trigger the EML, can you expand on the noise?
My (not a) Citroen:  
MK7 Ford Fiesta ST180 in Frozen White  Cool

           2-B
-----+----[  ]---+----------( ? )----
      |              |
      |     2-B   |
      +----[/]---+
[-] The following 1 user says Thank You to Zion for this post:
  • trebor
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#7
(10-08-2020, 04:47 AM)Zion Wrote:  The battery light would usually come on or flash, if the alternator wasn't charging the battery properly. I can't think of a situation where it would make the engine knock, is this a one time "clonk" then the management light (EML) comes on, or a continuous noise while the light is on?

I can imagine an injector failing, causing a different combustion sound and that may trigger the EML,  can you expand on the noise?

No, it's a constant loud knock while the EML is on. Got it warm last night, and the light went
off, and the noise stops instantly. This morning I fired it up, and it was okay for maybe 5
seconds, then the EML came on, and 'Knock' came back instantly. Its sounds loud like a bottom
end knock. Just don't see if that's the case - how it can go if the EML goes out?

I understand what you say about the battery light - however I got a knock similar to this last
year. Same side of the engine, but not so loud. First I was told it was a tensioner. Another guy
replaced the alternator, and the noise went. The EML did not come on that time, but I also got
no battery light come on, or problems with starting etc. I guess it was the bearings?
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#8
Is it the HP fuel pump?
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#9
(10-08-2020, 08:34 AM)cancunia Wrote:  Is it the HP fuel pump?

Hi

Sorry, I'm a bit ignorant about these things. Does HP meal High pressure?
And, there doesn't seem to be any problem with the starting, or driving of
the van. It doesn't splutter etc.
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#10
(10-08-2020, 08:37 AM)trebor Wrote:  
(10-08-2020, 08:34 AM)cancunia Wrote:  Is it the HP fuel pump?

Hi

Sorry, I'm a bit ignorant about these things. Does HP meal High pressure?
And, there doesn't seem to be any problem with the starting, or driving of
the van. It doesn't splutter etc.

Yep, HP - High Pressure / Injector Pump,  I was typing with one hand while waiting on the phone! I was thinking it might be a sensor on the pump causing the warning light. Can you use an app like Torque   or Lexia on the 1.9D to get live readings?
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