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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6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

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tripletauto
  • 1450 Answers

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

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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

dcgun007
  • 63 Answers

SOURCE: Ford f150 4.6 engine stumble

try cleaning the map sensor with map sensor cleaner.

Posted on Jun 21, 2009

canbruce75
  • 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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1 Answer

What is the part number of the turning signal relay? on the 1986 Ford Bronco II, and is it locatied on the passinger side fire-wall under the engine hood?


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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It goes in through the dipstick. Just use a small throat funnel, but take your time and keep checking the level. You don't want to over fill it. Check the fluid level while the engine is running, not off/cold.

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Try replacing the Throttle Positioning Sensor
Have the codes checked
You may need to clean the Mass Air Flow Sensor
this is best done by a professional as it contains some very sensitive wires and they are easily broken
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Mar 29, 2010 | 1986 Ford Bronco II

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4x4 does not engage on my 1986 ford bronco II


my buddy had the same problem with his bronco II im not shure what year it was but all it was for hime was corroshen on the back of the switch that switches 4x4 on and off

Feb 17, 2010 | 1986 Ford Bronco II

1 Answer

When accelerator is pressed down the engine stuters until use ease off the pedel. can only use 1/4 to 1/2 throttle.


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.

Feb 03, 2010 | 1986 Ford Bronco II

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the pump is on the top of the fuel tank and goes down inside the tank from there.

you have to drop the tank to get to the fuel pump.

Jan 11, 2010 | 1986 Ford Bronco II

1 Answer

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check the i.a.c. (idle air control) valve near the throttle body, it fixed my low idle!

Sep 09, 2008 | 1987 Ford Bronco II

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