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’86 Ford Bronco II 2.9L Driving Me Nuts. Have Replaced Almost Everything, Still Hesitatesloses Powerbucks

Posted in Ignition Systems | Asked on Jan 28, 2011
Below is the question about ’86 Ford Bronco II 2.9L Driving Me Nuts. Have Replaced Almost Everything, Still Hesitatesloses Powerbucks,

Regarding my 1986 Ford Bronco II 2.9L. STILL!! Have replaced computer-exhaust system-IAC-TPS-Distributor w/TFI modue, cap and rotor-ignition coil-plugs-air temp sensor- basically everything but the kitchen sink. It still hesitates – bucks – jerks – runs rough – stalls – pings – backfires- weird idle (up and down) sounds like I’m slightly revving engine, but I’m not touching accelerator. I’m at a total loss. I’ve been researching fuel pressure and fuel pump problems. Have not had this tested yet. Also, where are the fuel filters in this vehicle and is it a big $$$$ job to have them checked and cleaned (if in fact that is the problem)? Am planning on replacing the oxygen sensor as soon as I get the ridiculous $15.00 tool to pull out the old one. Can anyone out there help me figure this train wreck out? I took it to Sacramento (110 miles one way – hoping to reset – NOPE ) – On freeway it feels under stress/or over loaded (?) and hiccups every few seconds-popping under hood – Help

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There are 3 Answers for "’86 Ford Bronco II 2.9L Driving Me Nuts. Have Replaced Almost Everything, Still Hesitatesloses Powerbucks"

  1. Andrew says:

    A few things I’d try would be check your timing and that idle speed motor if that vehicle has one. Or they call it the Idle air control valve. But I’m not sure cause Ford is another language to me lol. Try the timing for sure though if you haven’t yet.

  2. Gearnofear says:

    Sounds like the engine is just plain tired. the fuel filter is located at the rear of the car, it’s not all that much to replace it. when it back fires does this happen all the time? You may want to have a compression test done on the engine. If your getting a constant back fire it’s possible you have burned or worn valves. there is also the posibility that the distributor shaft is worn and is putting everything out of time. your timing may be off. what your discribing to me does sound a lot like a miss timed or worn distributor. forget the compression test and have the mechanic check the distributor. It’s possible it is worn out, the vacuum advance is bad, or the distributor needs to be adjusted. Hope this helps and let me know if this was the solution.

  3. 25 Years Experience! says:

    You replaced the MAP sensor? Black about 4×3″ in size with a single vacuum hose going to it.

    You MAY be able to disconnect it (wires not hose) and see if it runs better, if so replace it. That is probably the problem. That is the number one sensor that determines the fuel for the engine.