BroncoII4x4.com

Mine, A 1987 Bronco II did the same thing

it was axle wrap that caused it to happen!

5" of lift, 3" leafs and 2" blocks

I put on Anti wrap/Traction bars and havent had the problem since

So If I were to upgrade to an 80A alternator, should also change the wiring and the voltage regulator? Thanks.

on late 86s
regulator is internal
wireing is the same

but replace the power outlet plug and use a lot of Dielectric Grease

on early 86s same regulator same wireing but between the two ...

Well, if you need an altenator right now the output is 0 amps

the 40 65 and 80 amp alts are all in the same case
so if it were me I would swap in the 80 amper

I had the same problem with mine!

turned out to be low voltage to the fuel pumps

The fix?

new fuel pump relay!

Idle Air Control Vave

yup!
just get all of the steering off of the the truck you strip it out of locking hub to locking hub

if you are still useing the federwell solenoid you may have missed a wire


see the wire from the battery lead post to the starter solenoid post?
if you did not do that then that could explain it!

Yup, get springs from a 4 door explorer, replace the centering bolts, swap them in
the explorer is spring under axle the Bronco II is spring over,
the centering "pin" needs to be turned over so the springs will work and it is easyer to replace them than trying to reuse them

Head cracks are less likely in the later models but it could be
take it to a shop where they can test for combustion gasses in the rad.
next step air in heater core or clogged, take off return hose at the heater core, run engine, and see if you get air or nothing if nothing replace heater core ...

the injector cleanners that you discribe are very good
do that as the first step or try this first it has worked for me!

http://www.bgprod.com/products/images/208A-44K-PE.jpg

"throwing parts at a problem"

http://partimages2.genpt.com/partimages/50258.jpg
the next step
NAPA

Item#: MPF318036 ...

QUESTION: on the james duff website, it specifies two dshafts, short and long, but only for 86 - 89. i have a 90, manual trans, do i need the short or the long? I don't know which i need. in the picture posted on page 1 of this thread, by mr. hair, is the top one, the double cardan the short one ...

un hooking the o2 censor isent going to solve anything it will either way lean out the engine or make it run way to rich you cant just do away with them

I did away with mine for a couple months with out a problem. Once it was gone, it idled much smoother. I later replaced it.

If you unhook the ...

your going to have to shorten your driveshaft about a inch and a half

Hmmm, it seems to me that you are discribeing bad injector!

they leak down when sitting and then spray way to rich when running

or your pressure regulator is shot
Is there fuel in the vacuum hose that attaches to it?

what has worked for me is a 7/8 box end wrench and a propane torch
heat up the "Bung" the O2 sensor threads into untill it glows then wrench it out
put a little more anti-sieze on the threads of the new one before you install it