The dreaded engine light - 939 2.2 JTS

[Citroënbender]

Can you borrow another ECU kit off someone?

[bazzbazz]

EML on immediately and lots of warnings flashed on the dash. Including the "low fuel" light and a zero reading on the fuel gauge! (Tank was at least half full!)

BINGO! Those are the tell tale signs of a faulty connection to one of the injectors or a problem in the injector loom. (Zero reading on fuel gauge & cruise control error & VDC)

1/ Disconnect Battery
2/ Remove each Fuel Injector connector, clean and insure is a tight fit when reconnecting
3/ Remove both large connectors to Engine ECU And clean and refit a couple of times to endure good contact.
4/ Reconnect Battery and clear all errors
5/ Test drive.

[ACE]

CB: no, I only know of V6s in these parts :-(

Thanks Bazz,
My reading suggests that to access the injectors, all of the air inlet plumbing - AFM to inlet manifold - needs to be removed.
That being the case I'd prefer to take the injectors off and get them serviced while they are easily accessible.
Being just before Xmas, I doubt I'd get them back for a while though.
But I'll give it a shot.

[Citroënbender]

Bazz - the injector and coil drivers never fault?

[bazzbazz]

Ok, just for now then disconnect battery and clean connectors on the Engine ECU plus the connectors to each Ignition coil instead and see what happens.

The exact symptoms you currently describe I had happen in a clients 159 2.2 JTS Selespeed. Cured it by cleaning as above.

If doing so does not cure, then fault will be at the injector loom connections or injector themselves. With luck by cleaning the ECU & Coil connections and allowing the Injector cleaner to do its work will relieve you having to go after the Injector side of things.

[ACE]

Coil pack was replaced last week.
Had a mate with me yesterday, so we went for a test run with him watching MES while we were on the move.
The EML flashed at start up and while getting moving. MES reported the usual story.
Cleared these codes while on the run, to see what else comes up.
After that the only instance of an error was as I drove over a small hill on a main road - I lifted off the throttle as we crested the hill (to maintain 80 kmph), as the engine went into overrun, the EML flickered again (P1175 only, from memory). After that no more codes on that run!

Until the next time I started the engine ...

I have now cleaned the ECU terminals, but yet to take it for another run.

[ACE]

Hoping someone can help ... (I can't post a picture tho - it's too big!)

What is the trick to release the fuel rail?
It's a cast aluminium thingy that sits between the "plenum" and the head.
I suspect it is just friction on the injectors that is resisting my efforts but I don't want to force it too hard ...

DONE!

[Citroënbender]

What device are you trying to post a picture from?

[ACE]

Answering my own question ... (and remembering that the object is to remove the fuel injectors ...)

First an image of the engine with the plenum more or less still in place ...

[ACE]

Image with plenum removed.
Things to note:
the shiny thingy behind the black connection tubes is the fuel rail, which is bolted to the head.
It acts as a face plate to the head while fuel is delivered via a channel below the ports.
The rail is attached to the head with a number of Torx bolts and two studs. The studs are top right and top left - just visible with nuts still in place.
To remove the fuel rail, remove all torx bolts and the two nuts on the studs (you also need to disconnect fuel lines and the ignition harness!)
Then, gently prise the rail evenly away from the head - and the important bit - making sure that the trajectory of the rail is parallel with the studs.
The injectors are below the air ports but their main axis is also parallel with the studs.

[ACE]

Image with fuel rail removed.
The two locating studs are clearly visible in this shot.

And off to the injector specialist ...

QED!

Or as my Latin speaking father would have said "Quite Easily Done!"

[ACE]

Each of the injectors appears to have a four digit code.

Q1
Is the ECU aware of codes for individual injectors?

alternatively, Q2
Is there an ECU parameter where the individual flow rate for each injector can be recorded - thereby possibly allowing fine adjustment to the opening times for each individual injector?

[bazzbazz]

Q1 - No, that's only for Diesel Injectors. No codes for the Petrol units

Q2 - Not adjustable via normal methods or normal maintenance software.

[Citroënbender]

Perhaps the ECU just needs a good birching, to stimulate flow of electrons into forgotten areas?

[ACE]

Time to commence the reassembly then!
Thanks all :-)