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1986 Bronco II ( just a little freshening up)


Gen. Maintenance

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Location
Fayetteville
Vehicle Year
1986
Vehicle
Bronco II
Suspension Style
4wd
My credo
I’m a man, and I can change, if I have to, I guess....
Sorry this is so long I believe I’ve been posting in the wrong section this is several days of trouble shooting.


DAY 1
So I finally got me one. Last week I purchased a 1986 Bronco II that started its life as an automatic. The PO has the auto trans swapped out for the manual and also replaced the transfer case to non electronic hand select type case. Exterior (except for paint) is perfect! Not a single dent, no severe rust, and only 150k miles. So far I’ve given it a freshening up. New plugs, wires, distributor, fuel filters, valve cover gaskets all the basic maintenance things you would do to a 35 year old vehicle. Took old girl on her maiden voyage yesterday Had to start it at the relay and it ended in catastrophe. So far I’ve identified a heavy clicking sound coming from the front drivers side wheel, both my front brakes locked up, the truck over heated and the starter relay failed and now runs the starter as soon as the cable is applied to the battery, no I’m stuck with a no start situation. Can’t hear the fuel pump prime, won’t crank on starting fluid. Its all good though. I’ve wanted one of these since I was 15. Got a new master cylinder, axle shaft, wheel bearings, fuel pump relay, and a whole assortment of vaccine lines in the way. I’m mostly posting this To remind myself what I’ve done, but I hope it helps someone out as I beat the gremlins out of this thing.

DAY 2
Currently in a crank but no start situation fuel pump does not prime during koeo and no spark while cranking,

1.) replaced all fusible links with a fuse block and corresponding fuse sizes.
2.) attempted to reset inertia switch under passenger side carpet.
3.) tested fuel pump by jumping pins at fuel pump relay connector.
4.) checked for spark with spark tester at several cylinders

Trouble shot it as being a possible ecm issue, trouble shot ecm relay and connector by

1.) checking for proper ground at connector checks at 5ohm
2.) checked for incoming power at relay 12v
3.)checked for output power on relay (NOTHING)

So now I’m working on why I’m not getting any out voltage at the relay. If the fusible link is good and the connector is grounded it should be good.
Attached is a really useful link for how to diagnose a bad EEC relay or connector

Part 3 -Testing the Ford EEC Power Relay (Brown Relay)

DAY3

SUCCESS!!! I scored a few spare parts from the local pick n’ pull (EEC, Inertia switch, fuel pump relay). I had enough free time to put them all in and after blowing a bunch of what I thought were the right size fuses to replace the fusable links, I managed to get her to fire. The EEC relay gets warm and the wire from the starter relay to the eec gets HOT, but only the short section I replaced. I’m not really sure what’s going on the possibly to small a gauge of wire.

next step is to one at a time remove the parts I replaced and see which one was at fault.
 


Gen. Maintenance

New member
U.S. Military - Veteran
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Location
Fayetteville
Vehicle Year
1986
Vehicle
Bronco II
Suspension Style
4wd
My credo
I’m a man, and I can change, if I have to, I guess....
Problem solved, short in the supply line to the fuel pump relay. No further issues, still haven’t done a test drive to check out the brakes but we’ll see.
 

Gen. Maintenance

New member
U.S. Military - Veteran
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Location
Fayetteville
Vehicle Year
1986
Vehicle
Bronco II
Suspension Style
4wd
My credo
I’m a man, and I can change, if I have to, I guess....
Quick update, since I got it running and driving I’ve started replacing basics. Got a new starter and duralast gold relay. Probably the most simple starter replacement I’ve ever done, two bolts and a wire and your done. I went ahead and replaced every vacume hose I could get my hands on, if anyone’s actually reading this and knows where to get the line from the bottom of the throttle body to the charcoal canister let me know. I replaced the idle air bypass and gasket as well as the MAF. Next was some new valve cover grommets. Did a full inspection of the wire harness for stripped spots and broken connections and finished with some new Sylvia headlights. Does anyone have a part number for the u joints in the axles? Are they all the same? Found out my high pressure fuel pump brackets missing and it’s just been bouncing around down there, luckily I was able to snag one of an old ranger at the pick n pull. If anyone’s got any freshening up suggestions or even exists in this forum I’m all ears.
 

JerryC

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Just some random stuff;
Check and clean the grounds. Should be at least a ground to the engine and frame, battery to core support and engine to firewall (drivers cyl head). My BII had a really crusty O2 connector, the high pressure fuel pump had one of the connectors widen out over time and cause intermittent fuel delivery issues.

Check/replace the grommet at the brake booster.

If you smell gas while driving, there is a grommet on the gas tank for the EVAP line that dry rots. Bummer is that you either have to drop the tank or cut a hole in the floor to get to it. BTDT.

Check the radius arm bushings, they tend to be neglected and if they get worn out you get metal to metal on the arm and bracket and eventually it will break. You may not hear or feel this happening. Also it will make the handling worse.

For cold weather, make sure the heat riser tube that goes from the exhaust manifold to the fresh air intake is in place.
Heater cores are easy to replace and most of the older Rangers and BII's have partially clogged heater cores. If your BII doesn't put out heat like a dragon, replace the core.

The plastic engine cooling fan likes to dry out and crack, the fan clutch is probably pretty old too, they may be contributing to your overheating.
Overheating is not good on these engines, check the oil for coolant.

How is your weather stripping and door/hatch bushings? Replacing those will quiet a lot of rattles.
 

Gen. Maintenance

New member
U.S. Military - Veteran
Joined
Sep 16, 2020
Messages
5
Reaction score
0
Points
1
Location
Fayetteville
Vehicle Year
1986
Vehicle
Bronco II
Suspension Style
4wd
My credo
I’m a man, and I can change, if I have to, I guess....
Awesome info man thanks for the reply!!!
 

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