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Runs great when cold...

 
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BroncBuster73
Bfix "What's a Bronco?"
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Joined: 29 Mar 2016
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Location: Big Island Hawaii

PostPosted: Fri Apr 08, 2016 11:16 pm    Post subject: Runs great when cold... Reply with quote

1973 w/ 302. Runs fine for a while, but when gets hot, chokes out and dies. Then feels like battery dying, and wont crank. Let it cool off, starts right up again. Any ideas. I have new carb coming from ebay...
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'73 Bronco
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U153 body code (cant find info!)
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Stan
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Joined: 29 Jun 2004
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PostPosted: Sat Apr 09, 2016 8:15 am    Post subject: Reply with quote

Check your timing - initial and total. Also your engine temperature - not by the temp gage in the instrument cluster.
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BroncBuster73
Bfix "What's a Bronco?"
Bfix


Joined: 29 Mar 2016
Posts: 9
Location: Big Island Hawaii

PostPosted: Sat Apr 09, 2016 12:58 pm    Post subject: Reply with quote

Thanks, I'll start there. Pretty frustrating!
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'73 Bronco
Uncut (for now)
302
HD package
U153 body code (cant find info!)
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BroncBuster73
Bfix "What's a Bronco?"
Bfix


Joined: 29 Mar 2016
Posts: 9
Location: Big Island Hawaii

PostPosted: Sat Apr 09, 2016 5:17 pm    Post subject: Reply with quote

Curious how timing would cause this? It seems st would be more of a problem when cold? Im not a mechanic, and appreciate any knowledge on this one!
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'73 Bronco
Uncut (for now)
302
HD package
U153 body code (cant find info!)
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Stan
BFix Locked and Loaded
BFix Locked and Loaded


Joined: 29 Jun 2004
Posts: 3606
Location: Boring Or

PostPosted: Sat Apr 09, 2016 7:14 pm    Post subject: Reply with quote

Too far advanced timing can make an engine run warmer also when an engine is warm to hot and it's slightly seized too far advance can make it harder to turn over.
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When you come to a fork in the road - take it
Homer - " Facts are meaningless . You could use facts to prove anything that's even remotely true."
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BroncBuster73
Bfix "What's a Bronco?"
Bfix


Joined: 29 Mar 2016
Posts: 9
Location: Big Island Hawaii

PostPosted: Mon Apr 11, 2016 8:55 am    Post subject: Reply with quote

Very interesting- thank you! Im sure there will be more questions! Ive owned this Bronco for 14 years and its been in storage the entire time. The guy I bought it from had it for 12- in storage. Pretty much relegated myself to the fact that everything needs replaced...
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'73 Bronco
Uncut (for now)
302
HD package
U153 body code (cant find info!)
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DirtDonk
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Joined: 27 Jul 2003
Posts: 2749
Location: San Jose, CA

PostPosted: Thu May 19, 2016 9:44 am    Post subject: Reply with quote

Right on the money with timing. But two other things that can cause it are excessive fuel dumping through the carburetor for some reason, and more common still is maybe a double-issue with your timing and an old tired starter motor not liking the heat.
But timing and other distributor issues are easy and cheap to check for, so that's a good route to take.

And since this has now been more than a month... Anything to report?

Paul

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'71 Bronco - 302 4v
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