360 will not idle in rain
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Freshman User
Joined: May 2004
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From: utah
360 will not idle in rain
I've got a 74 360 2 br, I'ts been raining here in Utah for the last 2 weeks and every time I start it up it wont idle until its been runnin for at least 20 to 25 minutes. on dry days its just fine. My other 74 ford 390 used to do the same thing, both had standard points. I'm thinking that might be the problem. Any info would greatly help. Thanks
Postmaster
Joined: Feb 2003
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What is the ambient temperature? Does the truck have the stock air cleaner? Is the heat stove intact? If you have an aftermarket air cleaner or no heat stove, you carb is probably icing up during the high humidity days.
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Joined: Aug 2001
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From: Evanston, WY
Hey, that's what I was going to say! The reason I asked about summer was to see if it could be icing or not. I had an open element air cleaner and an aluminum spacer under my carb before I started rebuilding it (my truck, not he carb), and it would ice up terribly under the right conditions (cold with humidity).
-Scouder
-Scouder
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Joined: Jul 2002
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From: Long Island USA
Did anyone think of something simple like a dizzy cap that's cracked or has a carbon trace on it? Bad wires? etc. etc. Anything where dampness will impede spark.
Do the wires/cap/rotor/plugs - especially the coil-to-dizzy wire.
The points are probably not the problem, although a bad upper dizzy bushing can make some crazy dwell angles and cause all sorts of problems when conditions change (like when it gets damp).
Take the cap off the dizzy, crank motor until points are open - grab the rotor and pushed it back and forth - do the points open and close? If so, time for a rebuilt dizzy or electronic ignition
Do the wires/cap/rotor/plugs - especially the coil-to-dizzy wire.
The points are probably not the problem, although a bad upper dizzy bushing can make some crazy dwell angles and cause all sorts of problems when conditions change (like when it gets damp).
Take the cap off the dizzy, crank motor until points are open - grab the rotor and pushed it back and forth - do the points open and close? If so, time for a rebuilt dizzy or electronic ignition
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Freshman User
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From: utah
I've got headers so i can't put the heat pipe back on, but i'll check the dizzy for play. Thanks for all the info. I am going to replace the wires too, And someone told me to adjust the choke? I'll let you know how this helps. Thanks again for all the info! Dustin
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From: saxton pa.
Idle Problems
My work truck will not idle under certain temp@humidity IE damp@cool
Traced it too carb iceing up. I put one of the old water heated carb spacers on it @ its much better. Easy way to see if you are haveing iceing problems is
on a morning your truck acts up shut it off and wait a few minutes for engine heat to thaw the carb if it idles fine it was ice.
GOOD LUCK HOTWRENCH
Traced it too carb iceing up. I put one of the old water heated carb spacers on it @ its much better. Easy way to see if you are haveing iceing problems is
on a morning your truck acts up shut it off and wait a few minutes for engine heat to thaw the carb if it idles fine it was ice.
GOOD LUCK HOTWRENCH
Postmaster
Joined: Feb 2003
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45 degrees could be cold enough to cause icing. As the fuel vaporizes it absorbs heat, lowering the intake charge. If the intake air is close to freezing point, the fuel vaporization could be enough to push it below freezing. You could try making a heat stove out of sheet metal to shroud one or two pipes on the header. You'll also need to be sure the flapper in the air cleaner snorkel is operating properly.
Since this will require fabrication, go ahead and try the other things first. But keep this in mind as a next step before you get too frustrated.
Let us know how it goes.
Since this will require fabrication, go ahead and try the other things first. But keep this in mind as a next step before you get too frustrated.
Let us know how it goes.
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