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Old 08-03-2011, 03:34 PM   #1
GM_Man
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Strange problem

Yesterday I got the A/C working in my '86 C20. But for some reason now my choke light is on all the time even when it's not choking the engine. Any ideas to why this is happening would be greatly appreciated.
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Old 08-03-2011, 05:40 PM   #2
thesickc10
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Re: Strange problem

my truck randomly throws the choke light on too but mine seems to do it more in cold weather. i dont have a choke on my carb and pulled the choke wire...i think its haunted
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Old 08-03-2011, 06:04 PM   #3
Axle
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Re: Strange problem

From what I recall, and this applies to the '83 specifically as thats what I've got, the choke wire goes to an oil pressure switch on the drives side of the block. If that switch goes open (oil pressure closes it. So no continuity through it with the engine off/no oil pressure), the light will come on. The light just tells you the choke is not receiving voltage, not how long it is in operation.

So you may have a bad switch, dirty connectors at that switch, or low oil pressure.

If you swap an engine and don't have provision for this additional oil switch you need to jumper that connector so you you have voltage getting to the choke heater. [choke light won't work anymore, and if you have the key on, your choke heater will be warming up, something to keep in mind if you tend to turn the key 'on' rather than 'accessory' for some reason]

Alex.
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