Injectors misbehaving but trying to understand the numbers

[darbuck]

I take it you don't have a Lexia because presumably if you did it would then show the injector flow correction in the same format.

I had this issue trying to work out mg/cp to g/s for the airflow meter on my Xantia with some complex maths so it would be easier like you said already if someone has the same engine and could provide sample data for their engine.

The one issue I have is if you did have the engine running smoothly at one point why after a turbo change has it all gone to pot?

Worth starting another thread I guess so find out if yours is an RHR20TEDVCEDU or whatever the exact engine code is and ask for someone with the same engine code. I'd have thought between RHR engines and even RHZ engines there will not be much difference because at the end of the day all these cars of the same size with the same capacity RH engine will run largely identical with approximately the same fuel efficiency at idle especially when you consider they will be similar MPG's at 56mph with slightly differing aerodynamics. The point I am getting at is at idle there are no such resistances.

I'll see what I can find. It's a shame I haven't got a Diagbox. I was thinking of getting a replacement Lexia unit ie the latest gold chip one but have been more tempted towards getting a Kingbolen K10.

My mate has several different pieces of diagnostic kit but I'll have a look at his Bosch KTS unit which may well have the right data on. In the meantime, let me know the exact ECU your vehicle has. Is it a Bosch EDC15 or 16 or perhaps a Siemens?

Hi Roger

Mine is a Delphi DCM 3.5

[darbuck]

Same as ok with stones but either way works for me. Work with M3 a lot so volume to me.

[darbuck]

Ok so I think I mixed up what the numbers mean. Looking at the results Cylinders 3 and 4 are leaking heavily.
1 and 2 were extremely negative numbers.

3 was leaking far heavier than all the rest but 4 caught up on it so it's failing quickly as well. I think if the correction is positive it is actually removing fuel.

My logic is this:
I think it is s a dwell time before the injector closes the more positive the number the quicker the injector is being commanded to close reducing the amount of fuel it allows through.

Negative being a retarded closing time If that' makes sense.
At least I know now, thanks Roger for suggesting the leak off test.

I have a couple of other injectors I can try in it but I won't get to it tonight.maybe tomorrow evening. I was surprised how bad they got suddenly just from sitting.

This may well indicate bad diesel from sitting at the side of the house for so long. I don't know. I may end up buying two refurbished units but I will wait until I have tested the other ones I have.

[darbuck]

Ok so I have tried different injectors in 3, 4 and 1 and she won't start. Yes they were all coded in correctly. I just think I have no good injectors out of all the sets I have 9 injectors in total

[darbuck]

Interesting video on piezo injectors

[darbuck]

I have all the injectors in the boot of the Primera ready to go for refurbishing hopefully tomorrow evening after work. i done a relative compression test last week and I had all even spikes across the cylinders so fingers crossed I am correct in saying it's definitely injectors. I'm going to Ask him to choose the best 4 of my nine injectors and then offer the rest as part exchange to try and recoup some of the cost see what happens.

[darbuck]

I left them with him he's going to test them and come back to me on Thursday. I told him the craic with them and he said if not the injectors he will be able to give me direction as to what to do next. He said it could be pump given the symptoms but said he won't know until he tests them. He told me to check fuel filter again so that's tomorrow evenings mission. I want to check it before I talk to him. He seems to think it's the pump or possibly timing causing over fueling given my description. He wants me to do a full compression test as well so I have to pull glow plugs and egr. I think I am going to get an answer soon though .

I have my work cut out for me.

[Rhothgar]

May as well graph the sensors too whilst you’re at it.

[darbuck]

Which sensors Roger

[Rhothgar]

Whichever ones I wrote about prior to you following injector route.

[darbuck]

Sorry Roger I'm not with it tonight I will go back through the threads tomorrow. How are you getting on with the xantia

[Rhothgar]

Sorry Roger I'm not with it tonight I will go back through the threads tomorrow. How are you getting on with the xantia

No worries!

Xantia! Which one? I’ll have e to go back through threads too.

[darbuck]

The one that kept leaking lhm not that that narrows it down I would imagine.

[Rhothgar]

The one that kept leaking lhm not that that narrows it down I would imagine.

No!

Not had leaks for a while it made an adapter on Sunday to adapt non-hydractive to hydractive strut top. Made it with more width on the hex.

[darbuck]

brilliant hopefully that's it sorted now and with it adapted to hydractive you will get longer out of it. Nice handy little mod.