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PostPosted: Tue Sep 06, 2016 8:17 pm 
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The engine switches to LPG ok, and runs fairly well upto about 3000rpm. However, after this it really struggles for power. There is no misfire evident, just feels like driving with the handbrake on.
Changing from sequential to MJ sequential hasn't appeared to make things any better so shall I go back to 'sequential' ? Can anyone explain what the MJ difference is?

The main earth and live feed are connected directly to the battery. The red/white (two of these) are connected to the wire feeding the +side of the injectors.

Maybe I should unwrap the injector wiring and go through it again to see if anything is amiss there because we are running out of ideas ;-)


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PostPosted: Tue Sep 06, 2016 9:16 pm 
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The pic seems all OK. Did you reset the ECU or similar between the warning message and taking the pic?

Didn't really expect EM interference to be a problem but given your symptoms was worth a shot.

Did you check the readings in 'injector check' screen as suggested? If these readings are correct (particularly pinj when running on LPG) there'll be no need to unwrap wiring. A flying check of forum this evening so I haven't had chance to check all previous replies to see if I needed to ask.

Do try moving the red/white to battery + at least temporarily to see if there's any change. There are two red/whites as you have two injector break looms, all injector break looms have a red/white but only one of these actually connects to the LPG ECU. If you look at the ECU side of the injector break loom plugs you'll see only one has a red/white (the plug for LPG ECU's bank1 corresponding to LPG injectors ABC) has a corresponding red/white running to the LPG ECU, the other plug doesn't.

No need for a thorough explanation on MJ/sequential as selecting MJ didn't improve matters! EDIT.. This is presuming you tried MJ sequential with various settings for extra injection filtering and various settings for rpm detection (including connecting brown wire) as suggested in one of my earlier posts. If you haven't tried various combinations with MJ yet, don't rule MJ out yet.

Simon

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PostPosted: Wed Sep 07, 2016 12:56 pm 
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In addition to my above post.

What does the ball do if you slowly increase rpm from low rpm to high rpm while not booting it (i.e. while keeping manifold pressure lower than about 0.5 bar)? To check under these conditions you could keep the car in say 2nd gear and accelerate only gently.

Now drive the car the same again while monitoring pinj's and ginj's in injector check screen - do any of the numbers hang or fluctuate abnormally (perhaps to zero or high figures)?

Simon

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PostPosted: Fri Sep 23, 2016 7:48 pm 
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Any update Colin?

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PostPosted: Tue Oct 11, 2016 1:17 pm 
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No update on this for over a month :( a bit rude after all the help Col :?: :evil:

If sorted, would be interesting to know what cured it :?: :?: :?:

Probably have to draw our own conclusions. :P

Simon.

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PostPosted: Sat Oct 22, 2016 8:08 am 
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LPGC wrote:
No update on this for over a month :( a bit rude after all the help Col :?: :evil:

If sorted, would be interesting to know what cured it :?: :?: :?:

Probably have to draw our own conclusions. :P

Simon.



Sorry Simon, I really do appreciate the help of course. I've been working abroad this month but now back home and back to the issues.
I went through the wiring again but can't see anything amiss. I reset the ECU and did another autocalibrate. Got the usual "callibration complete but not optimal" message. Again, seemed to run ok upto 3500rpm but terrible after that. So, instead of looking at ping timings I just highlighted the whole map after 3500 rpm and added 20%. This seemed to improve things vastly as far as running is concerned. I did a 500 mile round trip from Cornwall to London and it ran on LPG throughout most of this. Although driveable, the power is still down a little compared to petrol so obviously there's still room for much improvement. Over this journey the lpg consumption worked out at 3.8 miles per liter, (17.3mpg) The petrol consumption over a similar journey would normally be 24mpg. I imagine this is not far off expectations do you think?

The ball on the map still bounces about all over the place, but I've now discovered the "scope" function which records everything that's going on. I will use this to record some data on my next trip and maybe you can help decipher the results :-)


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PostPosted: Tue Nov 15, 2016 10:45 am 
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No probs.

You never tried an old spec ECU on it?

Simon

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PostPosted: Thu Feb 16, 2017 9:04 pm 
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LPGC wrote:
No probs.

You never tried an old spec ECU on it?

Simon


No I haven't Simon. The Bongo is off the road now for the winter.
When it re-emerges from my garage I may well pay you a visit if I get time during the summer :-)


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PostPosted: Fri Feb 17, 2017 5:36 pm 
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colin33 wrote:
When it re-emerges from my garage I may well pay you a visit if I get time during the summer :-)

Seems a good plan mate!

Cheers, Simon

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PostPosted: Mon May 22, 2017 8:39 pm 
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LPGC wrote:
colin33 wrote:
When it re-emerges from my garage I may well pay you a visit if I get time during the summer :-)

Seems a good plan mate!

Cheers, Simon


There's a slight chance I may be up your way on weekend of 10th/11th June. Do you ever work at weekends? If so I may bring the Bongo with me for your attention :-)


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PostPosted: Tue May 23, 2017 6:48 pm 
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colin33 wrote:
There's a slight chance I may be up your way on weekend of 10th/11th June. Do you ever work at weekends? If so I may bring the Bongo with me for your attention :-)
Play it by ear Colin? Will be able to see you one of those days but not sure which yet.

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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