P38A LPG issue Resolved

also, i thought the injectors were supposed to be kept upright, but I'm not sure on that.

I have the Bigas diagnostics and that shows both trims, but also have a basic obd2 dongle based app on my phone and that shows petrol injector 8 has a problem. Ran like it before it got up to temperature and I switched over to lpg. The petrol injectors have obviously been replaced at some point as they are soldered and heat shrunk probably all the poking around I had to do to get the old lpg pipes off, must have disturbed something. Hey at least I know how it all comes apart now

That could be a dodgy plug or lead, how does the plug look?

The soldering is probably for the wiring from petrol injectors to LPG ECU. Remember when switching modes most LPG ECU simply disable petrol injectors, and run the LPG injectors using the petrol triggers from the Thor or GEMS ECU.

If it runs smoothly (ignoring rich or lean) on LPG then the negative pulses from Thor ECU are probably ok. Other side of petrol injectors all go to 12V via RL19 & F37 [edited], but chances are that goes via LPG ECU as well (so it can switch them orf).

when i looked at pulsing an injector on the bench to test, the bosch ones at least appear to be 5v

Looking at RAVE again, I quoted wrong relay.

RL19 feeds A1-7 via F37 --> which connects to A1-5 to give +12V to injectors. The ECU probably pulses them but not completely to 0V.

Cheers guys for all the input, lots of things to check before I take it to bits again. Took it out for a 10 mile run, it is so smooth on lpg and acceleration is spot on. I left my diagnostic dongle in and the only thing it could detect is injector 8 on the petrol side. Everything else looks as it should. I will have to take it for a run with the Bigas software connected will have to run the cable from under the bonnet to my laptop.
As it was running perfectly on petrol before I replaced the lpg injectors I still suspect I have either snagged a cable or there is a dry joint somewhere.

Is it a constant misfire or just running rough?
Get it right on petrol first as that's your primary ecu

Constantly not running on all cylinders on petrol. The error shown on the diags is P0208. I do wonder if I may have left a plug off as had to unplug a couple of the petrol injectors to get my hand in to cut the old lpg pipework off.

I have just had a look at injector 8 using a mirror and torch, I can see a glint of copper wire under there but no way to get to it. So it's coming apart at the weekend

if you're lucky and have nimble fingers, you can lift the upper manifold with everything (coolant) still attached, just enough room to reach the injector plugs

It's fixed.... Stripped it down this morning and found no bare wires, think it was a bright orange wire I could see with the torch. It was a stupidly simple issue, the connector on injector 8 was sitting in place but not clicked down fully, must have caught it when I was removing the old lpg pipes. So I ran the full Bigas calibration and it now ticks over smoothly on petrol and on gas.

Excellent. BTW Andy, edit the thread title & add "FIXED" or "SOLVED".

Fantastic matey well done so pleased for you.

kermit_rr said:

Is that bosch or gems? Looks nothing like nine

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It's an eight not a nine Kermie.

tomcat59alan said:

It's an eight not a nine Kermie.

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He's back!
Incoming.... Hahaha

tomcat59alan said:

It's an eight not a nine Kermie.

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Ah yes that'll be it

kermit_rr said:

Ah yes that'll be it

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Cut your thumbs off before counting Kermie...but don't buy a 10 cylinder S8!

tomcat59alan said:

It's an eight not a nine Kermie.

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Or sometimes a seven or even a six depending on which bit has failed

Datatek said:

Or sometimes a seven or even a six depending on which bit has failed

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Or a 10 or 12, or more, depending on how many bits left over