1987 Ford Bronco No Spark

1BIGMOUTH

MEMBER
1987 FORD BRONCO
V8
4WD
MANUAL
89,000 MILES

Have a FULL size 87
Fuel injected v8
Driving down the road 75 or so and Engine died.
No sputter, No intermittent anything just total loss of power.
Replaced pip, ign module, coil, distributer, checked and replaced Computer, distributer rotor, cap and wires.
Still no fire?
Checked the TPS and read changing ohm values as a variable potentiometer should.
Is there another series of lock outs to stop spark like a full open throttle or lack of clutch engagement that I missed?
I thought myself a good Mechanic WRONG !
NEED SO HELP GENTLEMEN OR LADIES this is freaking crazy I cannot figure this out.
HELP

5 Replies

MASTERTECHTIM

MECHANIC
4,749 POSTS

Have you checked for 12volts at the coil?

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Saturday, August 2nd, 2008 AT 6:05 PM

1BIGMOUTH

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3 POSTS

Yes on the 12 volts. It is present with key in the run position.
I am curious about the pulsing and maybe being locked out because of external conditions.
1 could no engaugement of clutch be a factor.
2 could the throtle wide open be a factor.
These I have concluded good but not confirmed.
The other is, is the computer capable of shutting me down due to an (open) in one or more of the 8 injectors.
The weird thing is it just lost spark tooling down the road
. Now I had a Chevy 3/4 ton years back and ran wide open and it died in a similar manner. The problem was a simple fuse for injectors.
Could the ECU effectively shut me down from allowing the ground pulsing path for a spark for any other reasons. I check the resistances on my module and they all proved fine.
I can even advance my distributer and engage the fuel pump with the key on.
I just cannot get the SPARK?
I am ready to tow dolly her to the Dealer with My YUKON.
Here we go with the FORD jokes?
I have also checked all of the fusible links that I know of in the system as well.
IF someone helps me out there is at least the top mechanic ranking and a few dollars for beer or drink of choice in it.

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Saturday, August 2nd, 2008 AT 8:59 PM

MASTERTECHTIM

MECHANIC
4,749 POSTS

Ford is not my specialty but i know that wide open throttle will not shut down ignition, only injector pulse and a bad clutch switch will also not shut down ignition, only crank. a shorted injector will shut down injector pulse to all injectors but will not affect spark. ok i just looked at wiring schematic. check for 12 v at injector feed wire with the key on. this might be as simple as a bad eec relay, which is so so so common. if no power there then replace the eec relay. check that out and we will go from there. now you have me curious. not about the beer just the top mechanic ranking.

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Sunday, August 3rd, 2008 AT 6:05 AM

1BIGMOUTH

MEMBER
3 POSTS

12volts to relay`s
12 volts out of relay`s in run position
12 volts to both sides of one half of my injectors
cannot easily reach others.
I have removed the cap exposed rotor and watched rotation while engine was cranked.
I have turned key to run position and heard the fuel pump engage when turning my distributer quickly by hand
This lends me to believe that PIP, TFI MOD and computer are funtional to a point. Now my problem is why do I not see a flashing from my light ( 12 v ) when I crank my engine (plugged into coil ) all I see is steady state.
I think it`s time to talk to my favorite @#@! At the dealership and pay, and pay and pay.
Thanks for the attempted help and I will not bring her in till the end of the week so if anything comes to mind I would more than welcome the INSIGHT.
Thanks

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Sunday, August 3rd, 2008 AT 9:12 PM

MASTERTECHTIM