Xsara II 2.0 HDI 90 Fuelling Issues

[GiveMeABreak]

That was with reference to a Xsara Picasso - but different engine to yours.

The MAF for yours is part: 19208Q and is pictured below at (12)

Is that what you wanted to know?

[dave_xsara]

I was wondering if it was the same part no as mine so I could use the pin layout.
Just gonna stick a new MAF on now and see what happens.

[GiveMeABreak]

I'll take a look at a Picasso I have with the same engine and see if I have anything.

[GiveMeABreak]

Ok, so on the DW10TD engine on the Xsara Picasso, the Flowmeter is shown as 1310 (bottom Centre).

Wiring:
1341: Air temperature signal (Pin 1)
CM24E: +APC (Pin 2)
M132E: Earth 132 (Pin 3)
1333: inlet air flowmeter signal (Pin 5)
1337: Air flow sensor power supply (Pin 6)

[dave_xsara]

Thanks not sure how the pin layout refers to what I'm seeing - feels like I'm chasing shadows trying to get a definitive root cause to the problem. So I've just ordered a new MAF - sub £30 from the local motor factors.

Will plug it is and see what happens. If cured happy days, if not........

[GiveMeABreak]

Bear in mind that it may take a little while for the values to get registered from the MAF if it is indeed this at fault.

If you suspect an injector is faulty, might be worth doing a leak back test.

[dave_xsara]

Time as in minutes/hours/random?

I was initially told that an injector value above a magnitude of 1.5 or x3 value of the other correction values would require changing. However, I then stumbled into the F6(?) field in the Lexia which gives expected values and noted that anything +/-5 was in range.

So, I'm not sure. I'll probably leave it until I get a message from the Lexia about the injector.

Sometimes ignorance is bliss when it comes to these diagnostic tools.

[GiveMeABreak]

Indeed! Shame I can't really help you as I have a totally different system and with no reference values to compare with for this engine...

The MAF values themselves are more or less instantaneous, but it's the injection ECU itself that will take a little while to adapt to the new values (if these are wildly out from the old one) and adjust the air and fuelling. A trip of 5 miles or so should be enough.

[dave_xsara]

New MAF didn't remove the fault.
Gonna knock this one on the head as I can't see what is wrong at the minute. Car drives fine and is not lacking in power. Wiring seems okay too.

[dave_xsara]

Driving up motorway doing 70 in outside lane and car suddenly dies on the spot!
Luckily it wasn't busy so got into hard shoulder. Electrics still working on dash. Could not hear if fuel pump was working due to traffic noise. But after a minute or so, car fired up and has been grand since.
MIL was on and got the fault. See attached. Was leaning towards fuel pump, but Google didn't mention it.
There is a new high pressure fuel regulator recently put on so I don't think it is that. As above posts, new MAF out on too.
Injector readings are now all +/-0.75.

Only permanent fault is the high MAF reading which is double what it should be at idle 490mg/cp. Should be between 200 and 290. Yet removing the MAF and the default was 535mg/cp!

Another thing I've recently noticed if they the fuel gauge would suddenly drop to completely empty and flash the orange light. Then after a random period of time it would just start rising again and correct itself. Sometimes it would not work until the next time I went to drive it.

[dave_xsara]

Found this here: http://www.bba-reman.com/forums/Topic63872.aspx

As for these Pugs.. I you say , there's loads to research but I think the bottom line on these should be , when replacing fuel filter, allow for cost of complete unit . ie, filter & housing complete. Comes as a housing with fuel filter in it... so no worries of air suction/leaks... which I guess will be the original posters problem,

I've also read another thread where a user with p1138 fixed it by replacing the fuel filter housing as the bio metal strip (bi-metallic?) In bottom of housing of early c5's.
P1138 was a fault I had logged on page 1.

Really don't want to have to scrap this car as when it is going it goes perfectly but I can't risk it cutting out again on motorway with no warnings.

[GiveMeABreak]

I've split this out of the diagnostics Lexia installation thread as it now is going into specific faults.

[wheeler]

I've only just noticed this thread.
The air temp, brake switch & evaporator faults are logged in nearly every single 2.0 HDi xsara I have ever scanned. I would regard them as 'phantom faults'.
There was a mod years ago to run a new earth to pin 3 of the MAF but I didn't find it helped any & still always came back.

As for P1138 - this was often cased by a poor connection on the little 3 pin connector on the fuel rail pressure sensor, if you follow the wiring for the sensor down a few inches there is a 3 pin connector (yellow from memory), its clipped onto the engine block just above the sump. Cut the connector out & solder the wires direct. If that didn't work you replaced the fuel rail pressure sensor. A typical symptom of this fault was the engine running on for a few seconds after the engine was turned off.

If you need a wiring diagram I still have some original workshop manuals for the Xsara so may have a paper copy I could scan, would need your RP number to check.

[GiveMeABreak]

So a couple of observations:

Definitely sounds like a fuel starvation issue - either as a consequence of low pressure or an air lock for example.
I don't recall you said you actually replaced the fuel filter in this thread, if not how old is it - but if you have , did you prime the fuel system properly after fitting it? (Edit: Ignore that bit - self-bleeding on the Bosch)

Fuel rails are notorious for throwing wobblies if the sensor alone is replaced - I know Citroen don't sell the sensor individually,preferring to supply the fuel rail complete with sensor and there is a specific warning about not separating this (whilst under warranty at least - warning of problems).

I know you don't have a Comms 2000 unit, so that can't be responsible for the cut-out. I understand that fuel starvation can cause power loss - but not of the electrical power loss.

So I think some fuel investigation needs doing to eliminate the causes one by one. The pump may be fine but if there is an air lock then it won't matter.

[GiveMeABreak]

If you need a wiring diagram I still have some original workshop manuals for the Xsara so may have a paper copy I could scan, would need your RP number to check.

His RPO is 08802 (Bosch mounting)