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[Kevin Wood]

Is the vapour pressure OK? Just wondering if the pressure is dropping when the LPG injectors fire and it's reverting to petrol.

The fact that it runs on petrol means the injector signals are getting to the gas ECU as they loop through it and back out to the petrol injectors.

Kevin

[Jay w]

pressure drops from 1.05 bar to .95 bar, not a great deal and well within range.

Lambdas drop from from .75 to .15 and then go back up but i put that down to the fuel change, it isn't running LPG long enough to settle down

[Kevin Wood]

Have you got the lpg injector type configured correctly on the LPG ECU? I wonder if it shuts down due to excessive current through the injectors? I believe we configured Marie's ones as Valtek 3 ohm.

Kevin

[Jay w]

Have you got the lpg injector type configured correctly on the LPG ECU? I wonder if it shuts down due to excessive current through the injectors? I believe we configured Marie's ones as Valtek 3 ohm.

Kevin

yep, i have even tried other configs just to see if that helped.

all the sensors are set a they should be as well

[Kevin Wood]

Hmm.

Are there any faults stored on the LPG ECU?

Kevin

[Jay w]

Hmm.

Are there any faults stored on the LPG ECU?

Kevin

No, and nothing on the petrol ECU either

This is the 8 cylinder ECU and loom we are using, but in the settings i have just changed everything 6 cylinder and the 7th and 8th injector leads have been tied back

[Kevin Wood]

AFAIK the ECU supports up to 8 cylinders anyway, so you just have a few spare wires in the loom. Can't see what would cause a problem there. :-/

Kevin

[Jay w]

AFAIK the ECU supports up to 8 cylinders anyway, so you just have a few spare wires in the loom. Can't see what would cause a problem there. :-/

Kevin

the plan is tomorrow is to disconnect the battery, pull the connector on the ecu and try again, in addition we want to see it there is voltage on the LPG injectors, from there i don't really know

[Kevin Wood]

Could there be a wiring problem with the tank valve circuit? Really clutching at straws now though.

I'd also check the connections to the control panel / level indicator. Had some weird things going on with Marie's install when we had a short here.

Kevin

[Jay w]

Could there be a wiring problem with the tank valve circuit? Really clutching at straws now though.

I'd also check the connections to the control panel / level indicator. Had some weird things going on with Marie's install when we had a short here.

Kevin

We can hear the valves clicking both front and back end, that was one of the thoughts i had, we have voltage at the switch and going from it once it is active.....

 

[Jay w]

back on the case today, have checked everything and cant find any issues, all the connectors are in the right places, the voltages seem to be equal across all injectors, the tank and vaporiser solenoids are kicking in, all the live data is reading correct.

Kevin the only thing i did different to your suggestion was the lambda connections, i went with the blue wires that go to each one,  would that have made that much difference? we are still getting good data and it cycles from about .15/.45/.75 which i believe is the same as it going lean/rich

I am starting to think we may have a faulty component here, shame Phate123 isn't around, he has James's old CDX i could have seen if i could borrow his ECU for test  

Giving up on it until next week now

[Kevin Wood]

Sounds like you got the Lambda wires right. It was an educated guess which wire to choose as both disappear into the ECU with no indication which is the signal.

You could pop over one evening next week if you like, and we can scratch heads, but it sounds like there aren't a great many more things to try.

Kevin

[Jay w]

I will pop over on e night Kevin and we will have a look.

Just one query, what size did you drill the nozzels, according to the instructions it should be 2.2 mm but i seem to remember them being bigger on the elite  :-/

[Kevin Wood]

James' nozzles were 2.5mm, as were Marie's on the 4 pot actually.

James' car complained about nozzles too large during calibration, but the injectors were flat out under full load at high revs and the durations matched the petrol duration pretty well so I'd say it was actually about right.

Kevin

[JamesV6CDX]

Guys feel free to ignore this (it may be totally off the mark!)

But I have recalled back to what Mr DTM advised me when I was converting my 2.5 CDX, and I'm almost certain that the RPM feed from the ECU was pin Forty something, maybe 44?

Sorry I can't be more certain without more digging...