4.3 won't start cold/wet - S-10 Forum
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post #1 of 7 Old 01-28-2019, 07:00 PM Thread Starter
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4.3 won't start cold/wet

Probably asked a hundred thousand times. But the search isnt working today.

My 2000 Xtreme does this, my 2000 blazer does this and a zr2 I worked on did this.

When i washed the engine bay with just a garden hose the truck absolutely will not fire up. Turns over, won't fire untill it's dry. My blazer is doing this now but when it's cold out. Like -10 celcius or more. Absolutely won't fire untill it's warm outside. I can hear the fuel pump going and all that. Never figured out the source of this, just avoided it but I need to move my blazer and I don't want to push it. Any help is appreciated.


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post #2 of 7 Old 01-28-2019, 07:14 PM
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Re: 4.3 won't start cold/wet

Easy.....don't go nuts with the water. Condensation forms inside the cap. Dry it out/spray with WD40 and you'll be good.
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post #3 of 7 Old 01-29-2019, 10:21 AM Thread Starter
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Re: 4.3 won't start cold/wet

I'll give this a try when I get ambitious. Thanks for the reply!

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post #4 of 7 Old 02-02-2019, 12:27 PM Thread Starter
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Re: 4.3 won't start cold/wet

So I warmed up my dist. in my blazer with a torch. Yeah not a great way to do it but what evs. Tried to start it forever. Almost started once at the very beginning of my attempt. Turned the key off and on over and heald the starter on for longish periods of time. Not a single fire. Then I start giving it quick short bursts, a bunch of times and this made it start. Obviously took a few tries to get all that fuel burned out. Weird how log continuous tries wouldn't do anything. But a couple quick turns of the key did it.
Any thoughts on what this is?

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post #5 of 7 Old 02-02-2019, 12:36 PM Thread Starter
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4.3 5spd
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post #6 of 7 Old 02-02-2019, 12:45 PM
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Re: 4.3 won't start cold/wet

Why didn't you just take the cap off and visually inspect it?

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post #7 of 7 Old 02-02-2019, 05:47 PM
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Re: 4.3 won't start cold/wet

Most GM products with FI start best with short bursts. Voltage from the battery is highest when you first hit the key. The longer you crank the lower it gets. And since you're adding fuel it gets too rich inside the cylinder to easily light off. Even my old TBI plow truck starts on the second short burst, but not if I crank it. Haven't touched that engine in 10 years.
Doubt taking a torch to the ignition system helped matters.
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