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 Post subject: Re: BMW X5
PostPosted: Mon Mar 20, 2017 10:23 pm 
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Joined: Wed Sep 29, 2010 5:01 pm
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Location: Yorkshire
Yeh I wasn't being funny ians, was trying to prevent a wasted trip.

Most code readers tell if you the vehicle is running closed loop on each bank, they'll say something like bank 2: CL (closed loop), and then if you can see lambda voltage flicking between 0 and 1 volt (or lambda flicking between just below 1 and just above 1 if lambdas are wide band) and fuel trims are a reasonable figure you know the engine is running ok closed loop on that bank. It may be that 'oxygen sensor bank 2 active' with your setup means the same thing but you should check, because never know this could just mean heater circuit checks out ok on your reader.

There are no flaps inside that manifold but there are internal pipes inside it's inlet port runners, these just carry air. If the end of a spud is in one of those pipes then gas isn't going into the main airflow and that will cause problems. If a spud is fitted too high, then when the engine is idling the gas injected from the spud won't be mixing with air going through those pipes so again will lead to problems. I know through experience that on this engine some thought has to be put into where to fit spuds, particularly on 5 & 6, because the petrol rail bracket slightly obscures position where you'd like to drill on one port runner and there is a raised bit of strengthening plastic on the other.

The BMW might not immediately run properly and closed loop if it has recently been forced to run open loop due to a problem, but it would be worth seeing if you need a new probed before you come if you can.

Simon

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 Post subject: Re: BMW X5
PostPosted: Mon Mar 20, 2017 11:03 pm 
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Joined: Sun Mar 12, 2017 9:24 am
Posts: 26
Hi guys
Simon I didn't think you were being funny.... I completely get that there is no point in you working your magic if there is something inherently wrong with the engine and I'd rather have that side of it right for when you see the car
I'm struggling with the electronics side of this.... The last petrol car I had was an 83 Renault 11 turbo and that had literally no engine management at all since then I've had diesel and if something was wrong the code reader told me what to change
The code reader I'm using is an autel mot pro that has a BMW specific program.... I'm wondering if I put it onto obd scan and read it if I'll get the open closed question answered
Fuel trims.... On petrol they're all pretty close on lpg cyl 6 is out

Manifold... I wish I'd taken pics last time it was off but if I need to I'll pull it off again at the weekend (easy job compared to the diagnostics)
If memory serves me correctly the internal pipes have little plastic caps on the end of them (they tend to drop out when putting the manifold back) if I'm remembering correctly then the lpg nozzles are close to the actual fuel injectors and not touching these secondary air pipes.... The nozzles are brass ones that have been drilled and tapped into the manifold... Looking at their location I can't see how they could have been put in without removing the manifold and injection rail
If needs be I'll pull the manifold off this weekend and photograph the nozzles and add them to the Dropbox folder I shared earlier


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 Post subject: Re: BMW X5
PostPosted: Mon Mar 20, 2017 11:44 pm 
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Joined: Mon Jan 23, 2012 12:21 pm
Posts: 818
Location: Milton Keynes
ians wrote:
Hi guys
Simon I didn't think you were being funny.... I completely get that there is no point in you working your magic if there is something inherently wrong with the engine and I'd rather have that side of it right for when you see the car
I'm struggling with the electronics side of this.... The last petrol car I had was an 83 Renault 11 turbo and that had literally no engine management at all since then I've had diesel and if something was wrong the code reader told me what to change
The code reader I'm using is an autel mot pro that has a BMW specific program.... I'm wondering if I put it onto obd scan and read it if I'll get the open closed question answered
Fuel trims.... On petrol they're all pretty close on lpg cyl 6 is out

Manifold... I wish I'd taken pics last time it was off but if I need to I'll pull it off again at the weekend (easy job compared to the diagnostics)
If memory serves me correctly the internal pipes have little plastic caps on the end of them (they tend to drop out when putting the manifold back) if I'm remembering correctly then the lpg nozzles are close to the actual fuel injectors and not touching these secondary air pipes.... The nozzles are brass ones that have been drilled and tapped into the manifold... Looking at their location I can't see how they could have been put in without removing the manifold and injection rail
If needs be I'll pull the manifold off this weekend and photograph the nozzles and add them to the Dropbox folder I shared earlier


You should find some sort of section called i/m readiness - or something similar. This should show your open/closed loop status in a simple to understand way.


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 Post subject: Re: BMW X5
PostPosted: Mon Mar 20, 2017 11:52 pm 
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Yup I know that's definitely on there in the obd section
Looks like using the BMW specific features was a bad idea


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 Post subject: Re: BMW X5
PostPosted: Tue Mar 21, 2017 11:15 am 
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Joined: Sun Mar 12, 2017 9:24 am
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Ok i've just spoken to the manufactures of my diagnostic tool ..... they weren't much help
i'll run an i/m readiness tonight and see what it says
from what i'm reading on my fuel adaptions and o2 readings that bank 2 pre-cat is heading on its way out
i'll swap both at the weekend whilst pulling the manifold off to check the nozzle sites (apologies if i'm using the wrong terms)


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 Post subject: Re: BMW X5
PostPosted: Tue Mar 21, 2017 12:03 pm 
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Joined: Mon Jan 23, 2012 12:21 pm
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Location: Milton Keynes
Might be worth swapping the sensors over rather than buying another one - if the fault follows the sensor you know its shot, if it follows the bank you know theres an issue there.


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 Post subject: Re: BMW X5
PostPosted: Tue Mar 21, 2017 12:14 pm 
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Brian_H wrote:
Might be worth swapping the sensors over rather than buying another one - if the fault follows the sensor you know its shot, if it follows the bank you know theres an issue there.


oooohhh thats a good call never thought about that ..... done it with coil packs and plugs never thought of doing it with the lambda


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 Post subject: Re: BMW X5
PostPosted: Tue Mar 21, 2017 7:24 pm 
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Joined: Wed Sep 29, 2010 5:01 pm
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Location: Yorkshire
IM readiness doesn't usually tell you if a cylinder bank is running closed loop or if a specific lambda probe has passed IM readiness though. Best bet might just be a generic scan tool that shows live data. Or readings from LPG software screen can help determine that, especially if it's known that the LPG ECU is connected to the probe or LPG ECU can read live data via OBD, but this can take some reading between the lines. Starting to wish I hadn't mentioned potential for B2S1 being down, won't take me long to dis/prove it when you come. Why not buy one but keep it unopened in the bag, change it when you come if need be or take it back unopened if not?

Simon

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 Post subject: Re: BMW X5
PostPosted: Tue Mar 21, 2017 8:06 pm 
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Evening all
There is an o2 monitor section in the obd part of my reader that shows OL on both sensors when you start the car and after a couple of minutes they both change to CL
Which I think answers the question I've been looking for
In your last post Simon you answered the question I haven't asked... Do I change the sensor now or wait till you have the car? I'm going to wait till you have the car

I'll pull the inlet manifold off this weekend and photograph the spuds unless I manage to borrow a boroscope to do it that way
Apart from that is there anything else I should do before I bring the car up??


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 Post subject: Re: BMW X5
PostPosted: Tue Mar 21, 2017 9:20 pm 
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Joined: Wed Sep 29, 2010 5:01 pm
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CL is good.

I wouldn't even pull the inlet manifold off, it's a bit of a pain, and I know what spud positions work anyway.

Simon

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Servicing / Diagnostics / Repairs to all systems / DIY conversion kits supplied with thorough tech support
Mid Yorkshire
2 miles A1, 8 miles M62,
http://www.Lpgc.co.uk
Twitter https://twitter.com/AutogasSimon
07816237240


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 Post subject: Re: BMW X5
PostPosted: Tue Mar 21, 2017 9:24 pm 
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Dammit that means I have to talk to the Mrs this weekend unless I can find another car to play with :lol: :lol: :twisted:


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