HI,
I have a 98 AU Falcon, has done 325,000 kms (not ex taxi) i had LPG fitted at end of 2006 and has been pretty good up until now.
If i have the A/C on, when taking off, the car will change into 2nd fine, then i can feel a power loss and it hesitates to change into 3rd. I cant use cruise control as it keeps kiking it back to second gear while driving along at 100k/h. I can no longer over take as the car just doesnt want to go. I was taking my foot of the accelerator and then putting my foot down and it was fine, now it doesnt work like that. Car runs A1 on petrol and with no A/c on.
Any ideas?

My car is running similarly to this when on LPG, but a/c isn't a factor. Mine has a stepper valve that should be adjusting to allow more LPG flow under power, but when i disconnect the wires to it there is no difference, so i suspect it isn't operating for some reason. Mine is controlled by the LPG ecu, based on data from the HEGA. I don't know if your system is like this, but probably is, being an aftermarket system.

Hi,

Did you ever find the problem with your car, as my car is doing the same and I am at a loss as to what is wrong

Yes i did find the problem. It needed a new Alternator. This was replaced and the car is running like new again. Hope this helps.

How was the alternator affecting the cruise control opperation??Did swapping the alternator cure the erratic cruise ??

brake light switches cause cruise faults.

mine have done it several times.

new switches from repco are $9.50