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Old 03-30-2007, 07:25 PM
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Corvette electric choke problems

Hello! My 1980 corvette has electric choke issues, and I'm quite the rookie. With the ignition key turned to the on position, I have current at the electric choke connection at the carb. However, as soon as the engine starts, the current cuts out, leaving me with a closed choke and a very lean burning engine. Is this normal? Shouldn't the choke stay on when the car is running? If so, what's wrong, and how can I fix it? Probably a simple fix for the experts, but I am a novice, so any help would be greatly appreciated!

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Old 03-31-2007, 11:31 AM
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13 to 14 volts must be present at the choke at all times when the engine is running.
Use a voltmeter or a test light to determine if this is the case.

If voltage is NOT present at the choke there could be a blown fuse, bad connection at the fuse block or the firewall or a broken wire.

If voltage IS present at the choke check for a bad ground at the choke terminal and ground connection point.

The choke heater element wire could be bad. Use an ohmmeter set at OHMS x 0 to check for continuity of the choke element by disconnecting the 2 wires and testing across the terminals on the choke housing. If the meter reads infinity the choke heater wire is bad.

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Old 03-31-2007, 01:13 PM
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Originally Posted by JG700
Thanks for the help! I tried your suggestions -power at the choke only when the key is turned on (just before start), but no power when started and running. Fuse is good, choke is new. I have no idea what's wrong.


Checking the manual I see that somewhere around that year GM added a relay called "choke heater relay". Also they added an instrument light labeled "choke heater".
Is that what you have?
The relay contacts are normally closed and powered open by the brown wire from the alternator which also lights the "gen" lamp. This wire becomes hot if the alternator is not working.
It sounds like the relay is working but is being powered up by the alternator thus turning the choke heater off.
Is the instrument light working? It will be on when the choke heater is on.
Is the alternator working OK?
As a test try to disconnect the brown wire "connector" at the alternator to see if the choke heater stays on.

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Old 04-01-2007, 06:32 PM
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Doc here,

Here is the diagram for an 80 vette choke heater.

It may be you have the mechanical adjustment backward..the choke is actully open when cold (or no power to the relay) bump the throttle on a non running COLD engine see if it opens..If so turn the choke heater until the choke closes..that should set it right.

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Old 07-01-2009, 06:10 AM
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choke ideas

I was having problems with mine too, it never seemed to open properly and when it did it wouldnt close. keep in mind this was also a replacement sometimes if you just need the car to run you can go with the manual choke seems to work fine for me. that is if you dont mind screwing new things to your dash. my 80 already had a manual installed at one point before i bought it. the other thing i was considering is putting in another elect. choke connected to a potentiometer so that its both electric AND manual because running the steel control cable in a way that it works properly is tricky. does anyone know the ratings for the choke (vltg, amps, etc.) so i can figure out if my idea is even feasible. i dont wanna end up burning anything out.
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Old 07-01-2009, 07:32 AM
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Please check the last post date when responding to a post. The last date was 2007, if this guy has not fixed his choke by now he probably never will.

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