Need some Direction, no fire.

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Feb 16, 2009 | 11:24 AM

#16

quisp-n-quake

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Quote:

Originally Posted by Franklin2

The power to the oxygen sensor is just for the heater in the sensor. If it was shorted, then that would knock out some fusible links, and may kill everything, but to check for that, you need a testlight or voltmeter and start to poke around for voltage. I would see of you have voltage at the eec relay from the keyswitch.

OK...
12v Test light, and volt meter at hand:

POWER to EEC relay-(yellow wire)
POWER to FUELPUMP relay -(black w/yellow wire)
No other power at, or from wires
W/ ignition on, very dim power to RED wire at EEC relay,
AND very dim power at both sides of 20gauge Fuseble link at relay
(power at both side of fuseble link though..)

NO POWER at COIL- either side)
VOLTAGE at either side of coil w/power on is 0.05 volts
-and does register same 0.05 volts with key off
Checked ignition control module plug : Procedure as indicated in HAYNES manual.
CHECKED Terminals #2, #3, #4 all voltages w/ key on, and key start
Voltages all registered the 90% of battery voltage as expected for good power to module.
Book indicated for problem with Coil, to find problem between Coil, and Ignition..? should I be looking for another Fusible link?
Have any Ideas what I can check between the Coil and Ignition?
Thanks

Feb 16, 2009 | 09:32 PM

#17

Franklin2

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From: Virginia

If you have power on the white/lightblue wire at the ignition module, you should have power on the coil also, since it's the same white/lightblue wire that feeds the module.

Feb 17, 2009 | 06:56 AM

#18

quisp-n-quake

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Quote:

Originally Posted by Franklin2

If you have power on the white/lightblue wire at the ignition module, you should have power on the coil also, since it's the same white/lightblue wire that feeds the module.

Yes, I'm trying to track down the origin of that White w/ blue stripe wire to see if it in fact goes toward the ignition, or EEC relay area, If thats my power wire to the Distributor/Coil Mabey I can jump it and get this truck runnin..
I'm hoping it has a bad Fuseble link somewhere close to the fender/ firewall- heading out this AM to do just that..
Any pointers?

Feb 17, 2009 | 08:19 AM

#19

quisp-n-quake

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Quote:

Originally Posted by quisp-n-quake

I found a white wire w/ a blue stripe going into, and coming out of the Big Black plug near the relays- I tested it and found 0.47 volts- the same reading off of the Dist Module plug yesterday when doing the 90% batt test.
Does this White w/blue stripe wire run to the ignition switch, or into the Comp?- I cant find a fusible link running off of it..

Feb 17, 2009 | 05:09 PM

#20

Franklin2

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From: Virginia

It shows the white/blue in this diagram.

http://www.autozone.com/images/cds/g...3d800a3a44.gif

Feb 19, 2009 | 12:23 PM

#21

quisp-n-quake

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Got it to run...

I hotwired the Coil+ to the Batt+ and it started with the Key...
all systems, all components functioning, which tells me my computer is not dead.
However,-
I still have an electrical problem that concerns the Ignition between the coil, and the Key..I need to follow the White w/ blue stripe wire to the ignition, or rather the origin of the problem..

I stumbled into the website FordFuelinjection.com
and noticed through their EFI wiring diagrams, that they mention an Ignition Relay??
I haven't seen anything like that on my truck

1988 f150 EFI 5.0 Automatic)
Although I have noticed an additional Relay next to the brake booster attached to the upper fender, near the hood hinge- Anyone know what that is for??

Feb 19, 2009 | 01:09 PM

#22

Franklin2

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From: Virginia

Don't get side tracked. Unless you find something different when tracing/troubleshooting the white/lightblue, I would stay with that, and assume the diagram I gave you in the link is correct.

P.S.
A verified this with another diagram, the white/lightblue goes directly to the ignition switch.
It may become a problem trying to trace this wire, so you could just run another wire from a point on the engine to the ignition switch. Just keep in mind though, if this wire has a problem somewhere, there may be other wires with it that may eventually have the same problem.

Feb 19, 2009 | 05:03 PM

#23

quisp-n-quake

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Quote:

Originally Posted by Franklin2

I hear ya- the diagram you gave me is exact to the one in the haynes book verbatim- on N code motors,
I'm in the process of following this white /blu striper through the harness, and found that it might be changing color to red w/ green stripe..
-I like the idea of just running another wire to the ignition and to the coil..if in fact I can eliminate the actual problem..that ought to save me some grief when the time comes.
The problem w/ these Wire schematics are that not all of the Color wire codes are true-they are to an extent, however it seems ford did substitute a few colors on my truck..so I have to try and keep that in mind while im diggin through this spagetti, at the same time lookin at the book..
BUT.. I am on the trail..
I'm still wondering what that "Other" relay is though...
-Thanks