so dealing with the notorious bucking and sputtering, ive noticed it does it more when i go through a puddle, first take off after letting her warm up (slow speeds) and when i first open her up on the highway or slow down quickly from highway like from 60mph to 25mph. and now my gas milage seems to b going down a little. from research the most probable cause because of some other issues i also have, seems to be ignition module. add that to complications from other sending units and i think im getting in the ball park. i just ordered temp sender, thermostat, ignition coil, and ignition control module, ill repost when i get the parts and install them. just looking for some feed back on whether im going the right route. and has ANYBODY solved the bucking, sputtering, Bronco curse 100%?:crying:
Yep and replaced all of that and found a bad ECM too. And did it without a reader!!!!!!!!!!!!!!!!!! But one or two things here also make dam sure your ecm is hooked up tight cause a loose connection will run you squirrelly. Also if ecm is psycho
it"ll take out an ignition module really quick so get a good warranty on module. There's a thread to check ecm without a
reader sides an ecm is the only thing that won't throw a code. So if ALL ELSE fails buy one NEW they ain't real expensive about what it costs to have a computer read out. Mine was the most costly cardone has at 213.00 from
O really's. meagain:beerbottl
"Hello collective Ranger owners.
I joined to try and find an answer to my 1986 Rangers "bucking Bronco" issues. I found that there are many others with the same problem and no one really has an answer. A little disappointing, but, I think I have solved the puzzle. I'm not sure how to post the scan I made with my diagnosis. So,I hope my discription will be enough (check page 4-16, illustration 13.19c. The link looks like a long buss fuse on the opposite side of the TPS, in the Haynes manual). I don't do forums, it's my first time. Anyway, I found that the throttle linkage (located at the throttle body) has a connecting link that operates the throttle plate. It's about 2.5 in long and is pressed on to small pivots and is pulled by the cable. These links are worn and allow the throttle plate to "flutter", at partial throttle from engine vacuum at the 1500-2000 RPM range. When it "flutters" the TPS sees this and sends info to the PCM. It makes rapid adjustments to the system that the engine cannot handle. The engine ends up running to rich with incorrect timing. You know the symptoms, I'm sure. I tied this link together (with a heavy spring, I intend to make a solid link), to make it more of a solid connection and this prevented the "fluttering" from occuring. Wow what a difference! My engine runs much much better now. Highway and cruising is smooth and normal. No more black smoke and it idols! I want to share this info with the collective. I have tried everything that everyone else has tried and was very frustrated. Maybe this will help and save money for those new to this problem.
Let me know if this helps you too. I am very interested."
Thank you sir, i replaced my ignition coil and it seems that my sputter and bucking have stopped for now. ill keep this in mind if it starts again
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