Cold startup Vids...Voltage drop/grids cycle
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From: Land of milk and honey.
Cold startup Vids...Voltage drop/grids cycle
First Vid is intercooled a little colder and earlier
Second Vid is non intercooled w/firewall voltage regulator a little later and warmer
Third is non intercooled idle vs. high speed idle
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Joined: Mar 2010
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From: Prince George, BC
Thanks that was very informative. My "Wait to start" grid heater on my 89 don't come on until it's -9*C, unlike the later 91-93's. My grid heaters still cycle though during the morning warm up.
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Joined: Feb 2010
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From: southeast pa.
look on the back of your ECM and there will be a serial number on a white paper tag.ECM's before ser.#
0080000a will not preheat above 15,but they will cycle.they were only on the early built trucks.
0080000a will not preheat above 15,but they will cycle.they were only on the early built trucks.
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Joined: Mar 2010
Posts: 7,265
Likes: 1,346
From: Prince George, BC
Yeah mine is a early unit...I'd already checked.
We had a couple cold days...-14*c and I turned the ignition on...yup grid heater warm up. I wanted to make sure that the grid heaters worked properly. 
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