changing diesel injectors

cvloenen wrote:In relatiuon to that injector Lexia also said something about throttle not re setting? Anybody know what that may be about?

The trick with lexia is to get the Pxxxx code and the description that's shown with it on the screen. This can be used to identify the particular code. The easiest way is to just screen capture it. 'ALT + PRT SC' and paste into paint. Then you can save it and upload it to the forum so everyone can see the exact error code.

cvloenen wrote:I managed to do the fault diagnosis and I got that injector 2 was problem, which confirms what the guy I got the car from said, and also my leak off test showed 2 leaking of more than other injectors.

Looks like you have a couple of injectors to change

Hi guys,
Ive replaced my dodgy injector only to find the car is now not wanting to start. I feel it may be fuel problem, Ive drained the filter and put it back on, squeezed the primer till firm, when the car fires it runs for maybe 3 secs really rough then stops, as if it only get a little fuel and stops when its dried up. Theres nothing else you need to do to prime the diesel, is there?
Checked all connections etc, evrything is ok as far as I can see.

it's never worth refitting a used filter when a new one is so cheap and an old one can give problems that could be very expensive to repair.

Have you tried priming again, try several times of staring and priming after fitting a new C3 fuel filter - here for the 16v engine version of the filter (delphi HDF939 fits).



The Citroen C3 fuel filter for 16v HDi 1.4

Hi, I havnt bought a new filter as Im reluctant to waste money on the car, its cost me a lot already in time and parts, the old filter seems to be allowing diesel to pass through it, and it was running and starting prior to me changing the injector. When the car wouldnt start I drained the filter incase there was rubbish in it and put it back on. Checked fuel pipes for leaks, could'nt see any. Tried priming with bulb several times, never really makes any noticable difference.
Im going to get a friend to pull me and see if I can get it going that way, if that doesnt work then I might very well get a new filter. Other than that Im stuck, getting very frustrated after getting a new injector fitted/high presure pipes/inlet manafold seals, and now car doesnt want to start.
If the fuel pump is'nt providing enough presure is there any tell tale sign to look out for? Its always been a poor cold starter, bumped easy tho, thought this might of been a cause of the faulty injector.

The fuel filter has been known to cause problems, it has cropped up in the diesel section previously.

cvloenen wrote:Tried priming with bulb several times, never really makes any noticable difference.

You should feel a difference when its primed, the squeezy goes from quite easy to a definite stiffening and greater resistance to squeezing.

cvloenen wrote:If the fuel pump is'nt providing enough presure is there any tell tale sign to look out for?

You can get a reading from live data in lexia, but the pumps don't normally fail, its often an injector with high leak-off that is dropping the pressure in the common rail.

cvloenen wrote: Its always been a poor cold starter, bumped easy tho, thought this might of been a cause of the faulty injector.

You will also get a fail to start if the starter motor is not turning quickly enough, there is a minimum speed from the starter before the ECU allows the injectors to fire.

I got a filter priced today from local citroen dealer £52. I know their cheaper online tho.
Starter is turning fast enough, it is firing, butidles rough for about 3 secs max then stops, as if its run out of fuel.
The bulb is squezable but firm, you can hear it forcing fuel through the filter.

cvloenen wrote:I got a filter priced today from local citroen dealer £52. I know their cheaper online tho.
Starter is turning fast enough, it is firing, butidles rough for about 3 secs max then stops, as if its run out of fuel.
The bulb is squezable but firm, you can hear it forcing fuel through the filter.

I change my fuel filter more regularly than citron suggest because faulty injectors and filters are a common problem with the diesels. I only drain the water out a couple of times before the filter gets changed. The citroen prices is too high, I pay around £20 for the filter in the 16v 1.4, you can get them from here, here

There is also here (EuroCarParts website) all less than £25 and lots to choose from here


When I change my fuel filter, after knocking out the blanks for the sensor, fitting it and swapping over the fuel pre-heater box, I prime the filter with some fresh diesel. Just fill it up as far as you can with fresh diesel and fit it. This makes it a breeze to start after the filter change.

If you have had the diesel pipes off, then there is probably air in there too, can you crack the injector feed nuts a bit then turn it over to force out the air and then torque them back up?

thanks for links for the filters.
I pulled the car this afternoon and got it started, its lacking power, drives in limp mode. Im suspecting fuel was just not getting through properly, and still is'nt.
I was thinking about undoing the unions on the injectors but was put off the idea by all the warnings about the high presure fuel, and the fact no one seems to suggest it necessary. I'll try the slacking the nuts to see if I can clear the fuel dilevery, and see if things improve.
thanks

Tried slackening injector unions to clear any air, found good presure coming out of all injectors pipes. Car still the same, starts ok on crank, drives with lack of power, then management light soon comes on.
Any chance the ERG valve could cause these symptoms? But bit of coincidence it would be if it did go faulty just cause I changed an injector. I did notice that the ERG pipe did,nt have a gasket at its union with the valve, should there be one?
Thanks Ian

cvloenen wrote:I did notice that the ERG pipe did,nt have a gasket at its union with the valve, should there be one?

There are some EGR pictures here. There isn't a gasket at the union of the EGR valve body and the EGR pipe, just the clamp:

cvloenen wrote:Tried slackening injector unions to clear any air, found good pressure coming out of all injectors pipes.

Good, so you know the air is out and fuel delivery is good. Its going to be the ECU controlling the injectors.

cvloenen wrote:Car still the same, starts ok on crank, drives with lack of power, then management light soon comes on.

If you connect back up to lexia, you can clear the codes, and get a fresh set of codes to identify why the MIL is on.

A screen grab of the lexia screens showing the P code and its description for your engine would be helpful in identifying the limp mode and MIL.

cvloenen wrote:Any chance the ERG valve could cause these symptoms?

Lexia would help identify faults. EGR and MAP can give these symptoms, did you disconnect the MAP?





Citroen C3 Engine warning light comes on during acceleration