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2003 S80 bi-fuel won’t switch to LPG

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Old Feb 7th, 2018, 06:34   #11
reggit
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Just remembered, the system won’t switch if it senses a fault - so could be the stepper!

What is the light on the ‘petrol’ switch doing when you try and switch it to gas?

the stepper will throw a fault code which you can check with Vida if you have access to that.
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Old Feb 9th, 2018, 17:12   #12
CNGBiFuel
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The OP has sent me his stepper and I can categorically say the stepper is faulty. Dead-on-arrival. The OP's car could never run with this stepper.

Probably the original issue.

However I hear tales that the previous owner was a baboon. Ripped everything off the thing, now anyone's guess. There could be a heap of other probs...

Anyways, his stepper has been properly fried.
About 1 in 6 come to me in irrepairable condition. This looks like one of those. I will have another go...
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Old Feb 12th, 2018, 21:33   #13
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I read somewhere 18 deg is the magic temperature for switch over but that would be head temperature not ambient. Mine switches within 30 secs of running even in near zero temperature.
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Old Feb 15th, 2018, 14:41   #14
CNGBiFuel
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My Necam system. On a summer's day from cold about 20 secs, at freeeeeezing about 1min 30secs.

Warm? 10 secs... ish.
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