I am the proud owner of a 90 model bronco II, which has been an absolute beast for me.I've give it hell for 300,000 miles since i was 16 years old,but i now have a serious problem THE DAMN THING WONT CRANK
I was sitting at a stop light 1 day and it just died like i turned off the ignition.10 months later it still hasnt crunk up.Getting fuel and can here the pump coming on,so i pulled a plug and could not get a spark.Heres what i've changed so far,,
coil
cap
rotor button
igniton module
wires
plugs
even checked wires from coil to module etc,,

WHAT AM I MISSING,ECM maybe???i just cant think of what else could be making these things fire??? Has anyone ever experienced this problem?? Any imput is greatly appreciated.

THANKS


P.S the truck ran like a champ until that day

 

Does it have a automatic or manual transmission ?

 

If the "new" TFI module checks good (somewhere here there is a test procedure info), then the only other things to check are all of the sensors (I believe there is also tech info on checking them here) and the ECM. You may also be having a bad ground to the ECM/TFI module, etc. OR ... when was the last time you replaced the battery? Could be too weak or have a dead cell, causing the ECM to not fire the ignition / injectors. FL1A, the neutral / clutch safety switches are only for the starter solenoid circuit, not the ignition, if memory serves me correctly.

 

good battery and manual tranny

 

Now by saying wont crank you mean wont turn over or are you saying the engine wont fire up. Oh and welcome to FTE

 

turns over but wont fire and thanks for the welcome

 

well i had a similar problem and to be honest i don't know how i fixed it. I just juggled the wires that are on the drivers side near the coil and it worked ever since

Do you have an after-market tachometer installed? if your signal wire grounds out the truck wont run (and this IS from Personal experience )

 

Kernel-Panic; the initial portion of this thread had the statement that the engine
wouldn't crank. Hence my question concerning the neutral safety switch.

 

Did you change out the small hall effect coil in the distributor. Mine failed and this will cause a no start problem. You will have to remove the distributor and re time, but the part is only about $20 at most parts stores.

 

Look in the tech info thread at the top of this forum for the link on troubleshooting the TFI ignition system.

 

any one think it coul be the ECM?

 

Didnt ford have a problem with the gear on the bottom of the dist. for the 2.9 breakin? I kno it broke on my 4.9 and had the same symtoms. Id do the diagnosis on the ign. system first tho, before u throw parts at it. Like the coil, mod. ect..

 

already threw the parts at it havent pulled the dist. though

 

would you pull the dist. or put a $35 ECM on it ???also would the clutch cancel switch cause it to cut off all at once while sitting idle?

 

The clutch cancel switch should prevent the starter from operating. Have you tried
retrieving the codes from your current ECM?