Injectors misbehaving but trying to understand the numbers

[MattBLancs]

It's been one of those days though. All I succeeded in doing is making a mess

Oh dear! I know that feeling!

Hi all tried bleeding it with the hilka pressure bleeder, a bit better than the other one but leaks when the pressure builds up. Tried taking the cylinder off the car and filling it with fluid and reinstalled it. No joy. I tried pressure bleeding from the slave cylinder and it held pressure but I can't seem to get fluid to pass through the master cylinder. Beginning to think it's defective

I know several have reported struggles to get sealed on these (I must have been super lucky as I've not had this issue!?)
What pressure did you use? Not too high - 1 bar in the instructions I think.

Don't do the lid on master cylinder too tight - seems to seal worse more you tighten rather than better!

Can't remember if I ended up with 1 or doubled seals in this point (will have a look when I get chance)

Likewise, for not doing the kit's fluid reservoir - don't have it's lid too tight.

Will think if anything else helped me get the clutch bled .....

[darbuck]

Thanks for the pointers Matt, I will try again tomorrow.and post up.

[darbuck]

Ok tried your suggestions unfortunately no joy I'm convinced the master cylinder is wrong now. I will have to get an another one instead. I've wasted enough time on it. I'm going to wait until the end of the month and buy a genuine one and be done with it . still waiting on relay so can't move on that either.

I need to have a look at the ride on mower today it won't turn over hasn't since 2 years ago so I have my work cut out for me. It's older than the C5. Wish me luck.

[darbuck]

So got the ride on turning over it starts and runs for a couple of seconds and then shuts off. I think the carb needs looking at so will have to take it off and clean it up. I do have to change the carb bowl every few years. there's a weird size o ring in it that I can never find a replacement for and the carb bowl is only about 30 quid delivered and I get 4 or 5 years out of it normally and it comes with a new gasket so something else to get this month.

[darbuck]

So the relay arrived today, it wasn't it that was causing the p1350. So my diagnosis was wrong so back to the drawing board. It must be either a bad ground or the no 1 glow plug that had the low resistance.
I will check grounds first as they are the easiest to get at.Then check the glow plug

[MattBLancs]

O-ring: suggest buy a length of O-ring cord and some super glue, can make your own then? Not sure if petrol exposure would be an issue for super glue (of if it would matter as o-ring once trapped in place perhaps no issue if the glue fails??)

Master cylinder believed at fault: Have you contacted who you bought it off, think it's new you are struggling with - maybe warranty will be ordered and they'll send a replacement? Worth asking. Not sure what brand mine is but not a genuine one (will check when get chance)

[darbuck]

Never heard of O ring chord wil look into it, your a font of information Matt. Petrol and super glue don't mix as petrol is essentially a solvent but might hold long enough. As for master cylinder TRW made it. Mister auto sold it. I pulled the line off to remove it and lost one of the seals just my luck. I wouldn't say they would entertain a warranty if I have to send it back.

[darbuck]

Ok so I have checked all the grounds on the wing and they all seem fine and I removed all of the ECU and fusebox and reinstalled it. I couldn't find anything wrong there either. I have constant power to the connector at back of the engine when I split it. I haven't back probed the connector yet when it's connected but will try tomorrow evening.. it has to be either a bad glow plug or a bad ECU at this stage I think.

[MattBLancs]

I'd ask the question on returns, nothing lost asking I'd say

Quick look, it's too long ago to bring up the specific seller I used but there's loads to choose from. Here's an example:
https://ebay.us/m/XdJpmR

Think you can buy square section as well. Sold buy the meter. Cut the ends with a sharp knife nice and perpendicular, stick them together with super glue and off you go.

I bought various section sizes and...

... Don't think I've had need to / remembered to use it yet!

[MattBLancs]

Not sure what brand mine is but not a genuine one (will check when get chance)

First one I bought was TRW, but never fitted as had the 90° connection issue:

90° wrong

This is the one I bought that "looked right" and as it turned out fitted and functioned fine:

Also captured: the silly seal I lost

Luk

[darbuck]

Thanks Matt, nothing ventured nothing gained. I'll ask them today.I will buy the o ring chord it will either work or won't and it's a damn site cheaper than a new carb. I'm thinking on buying a good used genuine master cylinder, what do you reckon, worth the gamble.

[MattBLancs]

Thanks Matt, nothing ventured nothing gained. I'll ask them today.I will buy the o ring chord it will either work or won't and it's a damn site cheaper than a new carb. I'm thinking on buying a good used genuine master cylinder, what do you reckon, worth the gamble.

If you can find it similar sort of price I paid back in 2022 - I'd forgotten it was as cheap as £21! Then I'd not entertain a second hand one. Should be possible to get it functional with an aftermarket unit. I'm hopeful you've just ended up with a dud new unit (and if seller offers a replacement I'd go for it) - Shame it's a "quality control fail" but it can happen occasionally,

[darbuck]

Yeah these things happen Matt unfortunately. I'm chasing the glow plug issue now I have continuity from the glow plugs to the relay and from the relay to the ECU control wire and diagnostic line. I have good ground and 12v power supply. The plugs all tested good and I have 2.6v on the control wire when the ECU is not commanding it . If I run the activation test it cycles between 0 and 2.6,v so as this is a can network this is what I should see so the ECU is good. The diagnostic line has 12v so I can't find anything wrong apart from the relay not activating. what are the chances I bought a dud relay as well 1000000 :1 . My luck can't be bad enough to get two dud parts off the same supplier in the mater of a week could it.

Does anyone know how to bench test the glow plugs relay by any chance.

[CitroJim]

2.6V on the control wire seems a bit low to me Darren. Usually, the voltage swing between on and off is much larger in such arrangements...

Without being completely familiar with this setup, I'd expect the control signal - depending on sense - will be near 0v for off and near 12v for on. That said, I have seen 5V for on in some automotive circumstances...

It might be useful if anyone with a similar setup could measure theirs and advise what they see...

Something may be loading it down. It might be useful to check the voltage swing on the control line with the relay disconnected.

[darbuck]

Hi Jim according to the internet 2.6v is typical of a can network. I would have expected to see a 5v signal before reading it. I have 12v on diagnostic line. Its a pity Citroen didn't find the need to detail voltages. tried it with relay disconnected and it's still 2.6 v