bronco starts but does not turn on

[chiefsfan]

i have an 86 full size bronco...it started shutting off as i was driving...(put it in neutral & re-started it again) now it just turns over but will not start...i changed the coil..had the ignition control module tested & they said it was good.....im at a loss what else can i check ...plz help!!!!

 

[Elmo]

First off as always more info is required. fill in your sig with ALL info about your truck (year,engine,miles,any modifications etc).

Anytime you have a no start condition start with the basics

Does we have SPARK

Does we have FUEL ?

 

[chiefsfan]

its a 302 fuel injected with 56,000 miles...i had no major issues with it till now....i have fuel ...but no spark!!! thanks for ur help

 

[Rons beast]

Hey Chiefsfan,

Welcome,  Check that you have power at the + terminal of the coil.

If you don't, check fuses, and wiring to determine what is causing an open circuit. Sometimes a worn ignition switch can be the cause.

If you do have power, connect a test light between the + and - terminal of the coil, and crank the engine.  If the test light flashes, the coil is getting a "fire" signal.

All primary side ignition components are ok.

Check for spark at the distributor side of the coil wire.

 No spark is the result of a bad coil, or bad coil wire.

If you have spark and yet the engine won't fire, look for a corroded cap, high resistance in plug wires, or fouled plugs. (These conditions are rare, but possible.)

Most likely the test light will show no flashing, which is the result of a bad module, (I don't always trust the parts store test.) a bad pick up coil in the dizzy, or an open in the wiring.

M-5 has the low down on all the testing on those parts.

Good Luck

 

[miesk5]

yo chiefsfan,

WELCOME!

How to Troubleshoot a No Start
(Ford 4.9L, 5.0L, 5.8L) 

http://troubleshootmyvehicle.com/ford/4.9L-5.0L-5.8L/how-to-troubleshoot-a-no-start-1

 

[chiefsfan]

ok..i have to thank every one for ur help...obviously im not a mechanic...but i am trying...my bronco is still dead i have replaced the coil,ignition module ,fuel relay & no luck...i have checked the enertia switch ...no power &i can't hear the fuel pump come on when i turn the switch...& still no spark..any help is appreciated

 

[miesk5]

yo C,

I just entered a long reply, but Lost it while trying to open another Window.

For now,

NO SPARK;

did you do the tests as advised by Ron

and the Link I provided?

One Q about "... have checked the enertia switch ...no power"

Should see continuity between both sides of the switch; can ck for batty power later.

Inertia Switch Wiring Diagram in an 86 5.0
Source: by Ryan M (FireGuy50) at http://web.archive.org/web/20101201005123/http://fordfuelinjection.com/files/bronco_1986_103.gif

Fuel Pump Test & Diagram at the Diagnostic Link Connector in 84-95; "...Connect FP Relay to any ground to force the fuel pump(s) on when the key is in RUN...

Diagnostic Link Connector Location in 84-86 (red) located on Passenger wheel well near starter relay."
Source: by Steve at http://www.supermotors.net/registry/media/245234

Try this and let us know.

Fuel Pump & EEC POWER RELAYS:

FUEL PUMP RELAY

Location in a 85 302 (mounted behind the air box)  (I'd go with Chris)
Source: by Chris B (Blue, bronco boy)

or

Location in a 85; "... is on the driver side firewall near the fender to the right of the vacuum booster for the brakes..."
Source: by Wolfgangpeanut

  Socket Corrosion Info; "...if you had corrosion in your relay socket, then you probably have it other places. one at a time unplug all relays and connectors on that fender and spray them down with contact cleaner. then after you let that do it's job for about 30min-1hr, go back and unplug each relay and connector again (one at a time) this time put them together with di-electric grease. you can buy a tube of it from any electrical/electronics supply or auto store. make sure you get everything plugged back in..."
Source: by datrimm