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Author Topic: LPG Shut off coils  (Read 1836 times)

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TheBoy

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LPG Shut off coils
« on: 17 August 2019, 08:56:12 »
TBE intermittently won't switch to LPG, errors are low pressure.  Suspicion is one of the shutoff valves isn't operating, but its just a little bit too intermittent to prove.  Although it is getting worse.

Which puts me into random part changing :(

As the coils are easier to change than the actual valves, I was going to replace the coil on the vapouriser first (as its the easiest).

Are these standard. ie, if I buy any with the correct connector, will it work?  Also, I guess Tinleytech are the path of least resistance?
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TheBoy

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Re: LPG Shut off coils
« Reply #1 on: 17 August 2019, 15:53:28 »
Found the issue, front solenoid.  Ordered one. Well 4, seeing as I've knackered 2 of Gixer's this year :D

Marginally more expensive for 4 than the overpriced egay want for 1 ;)
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Kevin Wood

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Re: LPG Shut off coils
« Reply #2 on: 17 August 2019, 22:25:13 »
Was it a mechanical issue or a burnt out coil?
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TheBoy

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Re: LPG Shut off coils
« Reply #3 on: 18 August 2019, 20:23:32 »
My coil had gone intermittently open circuit.

The one I nicked of gixer went short when energised, popping the fuse, and destroying his solenoid. Opps.  Upon closer inspection, his has an EMF diode in, so guessing my wiring is wrong way round  :-[
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Kevin Wood

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Re: LPG Shut off coils
« Reply #4 on: 18 August 2019, 21:22:09 »
Quote from: TheBoy on 18 August 2019, 20:23:32
My coil had gone intermittently open circuit.

The one I nicked of gixer went short when energised, popping the fuse, and destroying his solenoid. Opps.  Upon closer inspection, his has an EMF diode in, so guessing my wiring is wrong way round  :-[

Oops! ;D
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aaronjb

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Re: LPG Shut off coils
« Reply #5 on: 19 August 2019, 08:47:04 »
You know.. I nearly replied yesterday to say "Knowing TB, user error" .. didn't think I'd have been half right ;) ;D
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TheBoy

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Re: LPG Shut off coils
« Reply #6 on: 19 August 2019, 18:14:35 »
Quote from: aaronjb on 19 August 2019, 08:47:04
You know.. I nearly replied yesterday to say "Knowing TB, user error" .. didn't think I'd have been half right ;) ;D
In my defence, the original coil has been working fine, but I guess just failed with age/use/sods law.

Clearly mine didn't have a diode in it ;D, so has been "working" no problem for the last 8yrs.  Hopefully the ECU had the required diode, else that's done well to survive this long.


Though I'm struggling to understand how the valve opened, if the coil was wired arse backwards, as my schoolboy level physics suggests it shouldn't  :-\
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Kevin Wood

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Re: LPG Shut off coils
« Reply #7 on: 19 August 2019, 20:32:19 »
I don't think then polarity matters. You just need a magnetic field.
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Doctor Gollum

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Re: LPG Shut off coils
« Reply #8 on: 19 August 2019, 20:36:17 »
Quote from: Kevin Wood on 19 August 2019, 20:32:19
I don't think then polarity matters. You just need a magnetic field.
As long as it doesn't have a diode in it :D
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Kevin Wood

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Re: LPG Shut off coils
« Reply #9 on: 19 August 2019, 22:24:34 »
Quote from: Doctor Gollum on 19 August 2019, 20:36:17
Quote from: Kevin Wood on 19 August 2019, 20:32:19
I don't think then polarity matters. You just need a magnetic field.
As long as it doesn't have a diode in it :D

Indeed.
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TheBoy

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Re: LPG Shut off coils
« Reply #10 on: 20 August 2019, 07:51:56 »
Now in my childish days of seeing how catastrophic I could damage electronics days - such as using reverse connected LEDs as bullets - I usually found diodes went open, not short.  But the 2 I knackered of Gixer's both went short.
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TheBoy

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Re: LPG Shut off coils
« Reply #11 on: 20 August 2019, 07:52:30 »
Quote from: Kevin Wood on 19 August 2019, 20:32:19
I don't think then polarity matters. You just need a magnetic field.
:y, I'll just reverse the wires when the new solenoids (which have diodes) arrive :)
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Kevin Wood

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Re: LPG Shut off coils
« Reply #12 on: 20 August 2019, 18:05:15 »
I've certainly had a few diodes fail shorted. Sod's law says they fail the way of maximum escape of magic smoke. ;D
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