90 Bronco2 stutters
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New User
Joined: Jan 2002
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From: wauchula usa
90 Bronco2 stutters
ive got a bronco2 with a 2.9 and it has a miss in all driving ranges.
i have replaced the plugs,wires,dist..cap and rotor and it still misses. It runs ok for the first 2 mins at start up then it starts stuttering .After it runs for awhile it smooths out then it starts missing at accelaration and starts to lack power.
Anyone have a clue ?? I dont..thankz
i have replaced the plugs,wires,dist..cap and rotor and it still misses. It runs ok for the first 2 mins at start up then it starts stuttering .After it runs for awhile it smooths out then it starts missing at accelaration and starts to lack power.
Anyone have a clue ?? I dont..thankz
Postmaster
Joined: Dec 2001
Posts: 3,742
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From: UT
90 Bronco2 stutters
Next two places I'd check are fuel delivery and air intake. specifically:
fuel pressure, which can indicate problems with the fuel pump, filter, and pressure regulator. If the fuel filter is due to be changed, consider changing it.
oxygen sensor.
air filter.
air intake tubes and throttle body.
mass air flow sensor.
fuel pressure, which can indicate problems with the fuel pump, filter, and pressure regulator. If the fuel filter is due to be changed, consider changing it.
oxygen sensor.
air filter.
air intake tubes and throttle body.
mass air flow sensor.
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New User
Joined: Jan 2002
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From: wauchula usa
90 Bronco2 stutters
I ran the codes to find code 54 ACT sensor is open ?
OK what does that have to do with very poor performance??
Or is that just a small problem and the real beast lies somewhere else?
OK what does that have to do with very poor performance??
Or is that just a small problem and the real beast lies somewhere else?
Postmaster
Joined: Dec 2001
Posts: 3,742
Likes: 2
From: UT
90 Bronco2 stutters
The ACT (air charge temperature) sensor tells the computer the temperature of the air/fuel mixture in the intake manifold. If you remember the ideal gas law (PV=nRT) from high school chemistry, temperature is an necessary part of knowing how much air is going in. If the computer doesn't accurately know this value, it can't calculate the proper amount of fuel to add to get the desired air/fuel mixture.
It may not be all of the problem, but I would think it's contributing.
It may not be all of the problem, but I would think it's contributing.
Freshman User
Joined: Dec 1999
Posts: 48
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From: Lisbon Falls USA
90 Bronco2 stutters
Got an 85 Bronco II with a 2.8 liter. Its doing exactly the same thing. Have you found the culprit on yours yet?? I also changed out all the secondary ignition parts and it still does this?? I'm miffed at this point.
Junior User
Joined: Nov 2001
Posts: 57
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From: Renton USA
90 Bronco2 stutters
I've got a '84 Bronco II with a 2.8 V6 and was sputtering also. Noticed fluid dripping under engine while running , traced it to fuel pump leaking from fitting on pump where metal pipe going to carb is attached to.(presure side! At least I know my ignition doesn't have stray sparks!). Replaced pump and stuttering went away. I know you probably have fuel injection, but you may want to check out the fuel delivery system also. Mike B.
90 Bronco2 stutters
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