2 Big Broncos Forums
DeepSeaSnake
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• Seattle, WA, USA |
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• Registered on 10/1/2003 |
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• 3 posts |
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 Posted:10/13/2003 12:58 |
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hey guys this is my first post here, thanks for having me.
I tried to search but the engine was down so I apologize in advance if this comes up alot.
Here's what I know and what happens
I drive a full size 1980 bronco with a 302, I bought it 2 weeks ago for 600 bucks. There is 173k on the truck and 20k on the rebuilt engine
The Symptoms
at freeway speeds heading up the pass (I-90 Wash. state) the bronc started to act like it was running out of gas, I call it choking around 3000 RPMS.
when in park the engine revs up well past the 3K mark, sounds and feels fine.
when driving around the neighborhood I got it to choke again right around 3k going 20-35MPH up a long steep hill but when it flatens out it seems to be okay.
also it seems to happen when its hot, or it doesnt happen when the truck is cold
Known Issues
I definatly need a new radiator it has a large hole in the bottom but it only leaks under pressure. I pulled over at least 10 times yesterday and shut it off and had to add water 3 of those times. My temp guage works and the truck thus far has not had problems staying cool.
the wiring is all goofed up under the hood, but its been running strong in similar and worse conditions for the 2 weeks Ive had it. Ive gone through and tried to do what I can with the wires that I have, just so far as to assureing good connections and what not.
My futile attempts
at first I thought it may be a vapor lock issue so I relocated the fuel line, now it doesnt touch anything, via zip ties, I deemed as a potentialy hot surface, didnt help.
I was thinking fuel filter, so I changed it out with a new one and a 2nd clear one up stream and it didnt fix anything nor have I noticed any crap in the clear one.
any way guys any suggestions would be great and thanks in advanced for the help
(cross posted to superford forum) |
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schmuck
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• nola, XX, USA |
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• Registered on 5/21/2003 |
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• 1,187 posts |
• 1 Vehicle
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Posted:10/13/2003 21:10 |
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i would say start with the basics, check all of your vacume hoses, make sure the fuel is atomizing properly when it leaves the carb, check timing, give it a full tune up and i mean a good one not just plugs and an air filter, look at the condition of the plugs that can usually be a good indicator of whats going on inside your engine, are you getting alot of carbon outthe exhaust do you still have a catalytic converter if so it maybe clogged
nucking futs
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Randy Zrubek
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• Palacios, TX, USA |
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• Registered on 5/1/2002 |
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• 82 posts |
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Posted:10/16/2003 23:20 |
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Yeah, the first thing that comes to my mind is a bad catalytic converter. There may be one or two on your Bronco, like a pre-cat and one behind it. Mine fell out with my muffler when switching out to duals. If the engine runs fine at idle, the other thing that comes to mind is the carburetor. If it was not replaced or rebuilt with the new motor, it could have a worn accelerator rod, clogged or worn jets, all sorts of problems. Another thing to check out is the EGR valve, it can cause some pinging or detonation problems when climbing grades above 50 mph. |
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Britt Jones
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• Austin, TX, USA |
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• Registered on 10/1/2001 |
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• 17 posts |
• 1 Vehicle
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Posted:10/24/2003 11:10 |
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I would start with the tune up and go from there.
Rotor, new dist. cap, plugs and new wires. You shouldn't go with the fancy platinum plugs. Just some plain autolite or comprable brand make excelent plugs.
B. Jones
ATX
http://www.supermotors.net/vehicles/registry/118 |
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mike artymowicz
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• Dahlonega, GA, USA |
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• Registered on 10/7/2003 |
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• 8 posts |
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Posted:10/27/2003 19:37 |
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I agree that it sounds like the cats but i would change the fuel filter first just for giggles(oops you allready changed them both) Hmm... It very well could be poor fuel delivery. Do a fuel pressure test if in doubt, its not that involved and at least you can eliminate that on thing. Keep us posted, if it's not fixed allready.. 
Hey maybye unbolt the exhaust if you have cats, see if it runs better then?? |
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John Carder
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• Boulder, CO, USA |
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• Registered on 11/22/2003 |
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• 3 posts |
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Posted:11/22/2003 23:35 |
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Did you check the fuel pump? When you're climbing, the engine is under more load. If the fuel pump isn't generating enough pressure, you may be starving the engine.
I could be wrong, but sometimes it's best to check the simple things first.
jc the chartguy |
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