xantia TD engine management light on

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John Plum
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xantia TD engine management light on

Post by John Plum »

Hi folk,

I need a bit of Xantia wisdom.

My engine management light is on all the time, but does clear at 3,200 revs only.
This happened at the time my aux drive belt started to shred, and which I immediately replaced.
The engine appears to be more noisy at idle.

I run veg oil. I ought to lok at the fuel sender unit too , to seee ig it is blocked, but given the coincidences here....

I guess the timing belt may have been caused to slip by a flaying belt. But what simple things, if any, should I look at first?

John
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Re: xantia TD engine management light on

Post by Xaccers »

Fuel filter, replace it.
Fuel sender, inspect the mesh filter on it and clean.
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Re: xantia TD engine management light on

Post by John Plum »

Lovely. I had just changed the fuel filter for the purpose, and because it was about due.

There are two coincidences here:
1. engine light came on same night, only following the flaying of the aux belt, and yet
2. there had before been indication of missing firing uphill.

SO, it makes sense to first clean the fuel sender next, then.

Anything else... perhaps?
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Re: xantia TD engine management light on

Post by Hell Razor5543 »

If the light remains on after cleaning the sender and going for a drive I would look on the Lexia page to see who's nearest, to diagnose the fault further.
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Re: xantia TD engine management light on

Post by Xaccers »

Having read again, if you're getting to 3200rpm then I'd guess she's not running sluggish which suggests it isn't fuel starvation causing the needle lift sensor to bring on the ECU light.
So, it is either the sensor itself causing the issue, or the TDC sensor causing the issue, or the timing has slipped a bit advancing the pump more than it can compensate for.
I'd pop the top covers off the cambelt and check timing.
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Re: xantia TD engine management light on

Post by John Plum »

Sorry abut the delay.
@Xac: The car had been running sluggish, I think. I cleaned out the sensor , finding it clogged with debris, but not gummed. Seems less sluggish. The engine management light remains on.
What and where exactly is the needle lift sensor?

The engine seems overloud at tick over, and I suspect that there is a engine whistle at low speed, life 1400 revs, but not exactly sure. It may be temperamental, plus the wind and aerodynamics. Light goes ff at 3200 revs, just the same.
Cheers lads.

@ Hell Razor5543: Yes a lexia reading would be good
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Re: xantia TD engine management light on

Post by DickieG »

John Plum wrote:What and where exactly is the needle lift sensor?
It's attached to no 3 injector which is the only injector with a thin wire running to it.
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Re: xantia TD engine management light on

Post by Xaccers »

Jenny had an intermittent fault with hers, sometimes she'd start and sound perfect, other times she'd start and sound like a bag of nails.
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Re: xantia TD engine management light on

Post by John Plum »

OK, suitably informed, I'm going to give it a good look over, in the goodness of time.
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Re: xantia TD engine management light on

Post by citroenxm »

When John is in North Wales, he is on my door step! He should know, he has been to me before..

I think messing with fuel filter etc is a waste of time, and Id say one of two things, the timing has slipped HOWEVER, a slipped one tooth on a TD will NOT START instantly on these, they will turn over for a bit before going.. Im more inclined to say that the Pump Advance is NOT working...

Mr Citrojim would tell you just like that when he appears... But thats my guess. The Pump advance can be tested on the Lexia too..

I had a TD Xantia that I did an engine swap on.. That would start instantly, but sound like a bag of spanners for a second or so, then the ECU advanced the pump and it went quiet...

We can read the fault stored which will tell us exactley what is wrong.. with the car useing the lexia.
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Re: xantia TD engine management light on

Post by John Plum »

Thanks for that CitroenXm, very useful tip. Sorry about delay: I did reply earlier to this post, but seems it died on its journey to the board, over cellphone network.

I'll call you on th enumber I have, or pm u if it doesn't work, Paul.
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Re: xantia TD engine management light on

Post by John Plum »

citroenxm wrote: Im more inclined to say that the Pump Advance is NOT working... The Pump advance can be tested on the Lexia too..
We can read the fault stored which will tell us exactley what is wrong.. with the car useing the lexia.
Is that an invitation to come over and get a reading some time? :)
I'd like to nail this, as performance and fuel consumption are suffering... :x
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Re: xantia TD engine management light on

Post by CitroJim »

Yep, I'd say a timing motion fault. Needle Lift Sensor as said or a plugged filter causing just sufficient fuel starvation to reduce pump transfer pressure enough to prevent full timing correction.

Lexia will confirm.

Easy to determine if the Needle Lift Sensor is knacked. Disconnect it at its plug and socket. If it's good then the engine note will substantially change, even on idle. If it's bad there will be no change in engine note.
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Re: xantia TD engine management light on

Post by John Plum »

@Citrojim Thanks for the tip. Unplugging the Needle Lift Sensor, at idle seemed to make no difference to engine note, but it did at 2 000 revs.

Could the outlet from the fuel filter be partially blocked? I noticed some fuel debris in there.

I think I may need a lexia on this.
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