1984 Ford Bronco Bronco now sounds like it is missing.

Tiny
BOBBYBOUCHEAUX
  • MEMBER
  • 1984 FORD BRONCO
  • V8
  • 4WD
  • AUTOMATIC
  • 219,000 MILES
I bought my teenager a 1984 Bronco last year. Other than normal replacement stuff, ie, battery, alternator, starter, valve cover gaskets, power steering pump, tie rods, etc. All his been good so far.

Last week he drives his girlfriend home, and all is fine. Next morning he gets in to start it, and nothing. OK, no problem, go out and get a new starter and installed it. Bam! Fired up right away, with one hitch? It now is no longer the smooth running Bronco it has always been, but it is shaking the center console something fierce, and upon acceleration, get even worse.

HHmmmmhh. So I figured it couldn't have anything to do with the starter going out, right? So I decided to give it a complete tune up. Changed all spark plugs and wires, distributor cap and roter. Having never done this, I thought I was Mr. Goodwrench afterwards. As I get into the truck hoping any praying that it would actually fire up, IT DID! And man was it running good! In fact, I noticed immediately at highway speeds it was now running about 2,400 rpm instead of about 3,000 rpm's it use to run at the same speed. I figured, PROBLEM SOLVED! All day it ran GREAT!

That night he came home from his football game and said, dad, the truck is doing the same thing. In disbelief, I of course took my own test drive, and sure enough, the same problem as before. The same problem I had "fixed" earlier in the day.

Now, what do I do? I didn't change the coil because everyone told me they either work or they don't? Is that true? Like a light switch, either on or off? I just don't understand how after I changed the plugs, wires, rotor, and cap and it worked great, that the exact same problem came up within 12 hours of going away.

Any ideas would be helpful and appreciated.I am at a loss right now. Should I just shoot the darn thing or what?

Bob

OK, UPDATE! Now my son says the problem is intermittent? Sometimes it will run just like it should, other times it will shake violently upon acceleration, other times accelerates just fine. Good news is so far it has started every time, and gets him to where he needs to go. What could this possibly mean? What should I replace next?
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Friday, September 18th, 2009 AT 12:44 PM

2 Replies

Tiny
JDL
  • EXPERT
Welcome to the forum. I don't like to replace parts without being sure, I'm not sure of the litre size of your engine? TFI modules are noted for problems.
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Friday, September 18th, 2009 AT 6:22 PM
Tiny
BOBBYBOUCHEAUX
  • MEMBER
It is a 1984, Full Size, 4x4, 351W motor with Holley 4bbl carb.

219,000 miles with an engine rebuild and trans rebuild at 147,000.

The other details of what has happened are in the previous email.

Thanks,

Bob
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Friday, September 18th, 2009 AT 6:37 PM

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