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[megaomega123]

Yeah sequential. Z32se engine. I've got intake manifold access down to about 4 mins now ha

[TheBoy]

Have you completely removed LPG ecu yet?

What system is it?

[megaomega123]

Have you completely removed LPG ecu yet?

What system is it?

Not completely. Only the injector giving the fault. It is a nevo plus system.
The thing i find strange is that on the software, whilst running, it says no signal on tb4 and tg4. I am assuming that the injectors aren't numbered the same as cylinders.
The lpg injector that isn't getting a signal is numbered 4 but goes into cylinder 3. Although the petrol injector is numbered 3. The software says 4 is the problem for both fuels??

[Doctor Gollum]

Someone has screwed the wiring up then...

[megaomega123]

Someone has screwed the wiring up then...

Well it has been perfect for 4 years so if the wiring was screwed, it would've shown before now!!

[Doctor Gollum]

Someone has screwed the wiring up then...

Well it has been perfect for 4 years so if the wiring was screwed, it would've shown before now!!

What I meant was that the LPG injectors should correspond with the petrol ones... That they don't muddies the water, but could suggest an issue with the LPG ecu or loom

[Marks DTM Calib]

are the injectors sequential/ individual on these or do they all fire at once like the old jetronic

Sequential (most setups have been since the Motronic introduction, Gm went pretty much al sequential since the C20XE days)

[Kevin Wood]

Someone has screwed the wiring up then...

Well it has been perfect for 4 years so if the wiring was screwed, it would've shown before now!!

What I meant was that the LPG injectors should correspond with the petrol ones... That they don't muddies the water, but could suggest an issue with the LPG ecu or loom

That depends on the wiring loom you get with the ECU. Often the grouping of the wires means that you can't follow the cylinder numbers accurately. It doesn't matter to the LPG ECU as all the injector channels are identical.

[cam.in.head]

are the injectors sequential/ individual on these or do they all fire at once like the old jetronic

Sequential (most setups have been since the Motronic introduction, Gm went pretty much al sequential since the C20XE days)

thankyou. apart from my omegas everything else i have is still jetronic !

[megaomega123]

Someone has screwed the wiring up then...

Well it has been perfect for 4 years so if the wiring was screwed, it would've shown before now!!

What I meant was that the LPG injectors should correspond with the petrol ones... That they don't muddies the water, but could suggest an issue with the LPG ecu or loom

That depends on the wiring loom you get with the ECU. Often the grouping of the wires means that you can't follow the cylinder numbers accurately. It doesn't matter to the LPG ECU as all the injector channels are identical.

Yay, I've been waiting for the expert!! So by that reasoning, when the software reads 0.0 for tb4 and tg4 does that mean that the lpg refers to the petrol injectors by the lpg injector number? Because lpg injector 4 sits on cylinder 3 and there was a number 3 tag on the petrol injector that supplies cylinder 3.
When following the wires the lpg injector for cylinder 3 is not wired to the petrol injector for cylinder 3.
Yet it says tb4 / tg4 not working.  I am so confused!!!!

[megaomega123]

I think the penny might have just dropped! The little number tag on the lpg injectors must refer to it's corresponding petrol injector number. Because i run 99% on lpg that explains the misfire on cylinder 3 but the lpg software saying the issue is with 4. also whilst testing over the past few days 'on petrol' p0304 came up.
So the issue seems to lie with petrol injector 4 not giving a signal to the lpg ecu?
So what is the likely cause? Wiring, ecu or petrol injector?