Question about 1986 Ford Bronco II

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1986 ford bronco II stumbles on acceleration

1986 for bronco II stumbles on acceleration , lifitng up on the throttle allows engine to regain power. very slow acceleration seems to eliminate stumbling problem. any suggestions as to cause and repair?

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Posted on Jan 02, 2017

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SOURCE: 2000 Ford F450 with V10

have you cleaned the throttle plate? this is done by removing air intake hose and spraying out with cleaner and wiping it down open throttle and wipe off the butterfly and bore. this will usually cure a stumble.

Posted on Aug 20, 2008


SOURCE: 1997 f150 4.6ltr engine has

thank you for responding, I went back to basics. New plugs began corroding on#3 & #7 cyl, causing a short(missfires).Tested the coil packs,& I recalled #3 cyl head was cracked, it was replaced with rebuilt head. As for the oil gauge flucuating, crank shaft bearings pitted and worn on #3 & #7cyl, due to the coolant(an apperantcommon problem..I took the truck in for an oil change,a ctc rookie put 5w30 instead of 10w30 as requested,in which caused the oil pressure to fluctuate. I dumped the the oil put 10w30 in and some lucas. 2 weeks later no ticking noises and no oil pressure changes.thankgod for lucus. its too cold to roll a set of bearings in the driveway. thanks again for your input. p s a 1997 f150 4.6ltr come with 2 sizes of serpentine belts, be careful of which one you install, we blew the bearings out of 2 new waterpumps,and for the last tip, the dealership uses a pair of vicegrips and an extra helping hand to set up the timing chains,that is what i was suggested to do by there top engine tech. prove me wrong. works like a charm.

Posted on Nov 07, 2008

  • 63 Answers

SOURCE: Ford f150 4.6 engine stumble

try cleaning the map sensor with map sensor cleaner.

Posted on Jun 21, 2009

  • 1776 Answers

SOURCE: 1997 Ford F150 4x4 5.4L

I would take the truck to an autoparts store and have the fault codes retrieved from the computer. Most stores will do the scan for free. I would lean toward a faulty throttle position sensor, but that's just speculation. The fault codes should narrow the problem down. Hope this helped and best wishes.

Posted on Jul 25, 2009

  • 1 Answer

SOURCE: Missing and stumbling during acceleration

4.2 ltr missing. 2000 truck, f150. Changed plugs, wires. Ran great for 2 weeks. Started again. Changed coils. Got worse. Changed fuel filter, did nothing. Added injector cleaner and fuel cleaner, nothing. Checked EGR, o.k. It is getting worse. Had new gas about the time it all started.

Posted on Jul 08, 2011

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Probably have 2 the same, one for signals and one for flashers (emergency) . Just take to parts store and they should be able to match it. Probably a Bosch, but same configuration and specs in other brands will do job. Or do temporary swap if flasher for emergency looks same.

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Try replacing the Throttle Positioning Sensor
Have the codes checked
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The most common problem for this is the fuel filter or dirty spark plugs. If it is the plugs you would have a slight miss when idleing or be able to smell gas fumes from exhaust. Also your gas mileage would go down. The fuel filter will cause the vehicle to feel like it will stall and die when you try to accelerate or raise the rpm's in idle. I hope this helps. If you try both and it does not help try pulling the trouble codes and having them checked.

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Sep 09, 2008 | 1987 Ford Bronco II

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