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[The Cambelt Kid]

Hmm. Ignitor circuit? Does that mean the feed to the coil pack primaries perhaps?  :-/

Do you pick up the RPM signal for the LPG system from a coil pack feed or from the RPM output onthe petrol ECU?

Kevin

ECU as per MDTM, the green wire on the lower of the ECU plugs, pin 52 from memory.

[Kevin Wood]

Ahh, OK. Was thinking it was detecting a fault in a circuit, as the description suggests, but if it's only reporting a misfire I guess that's nothing to worry about.

Kevin

[The Cambelt Kid]

I have just thought of a cunning plan for this little problem.  My old LPG installation switched to LPG at 1700rpm while decelerating; whereas my V6 is 1700 on accelerate.  Maybe I could try changing to decelerate and see if it cures the error.  

I never had the problem on my other LPG car and the switchover is transparent!  It’s a piece of cake to change and well worth a try.  Mmm speaking of cake – time for dinner!

Cheers
M

[Martin_1962]

Autos use accelerate, manuals decellerate

[The Cambelt Kid]

Autos use accelerate, manuals decellerate

With this in mind i have changed the required setting to switch gas on decellerate and reset the ECU errors.  So after a couple of short trips i read the ECU and have no errors (for now!)

The engine does not thump when it switches as it did before!!