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Author Topic: grey wire connecting to purple wire on ign module  (Read 2163 times)

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Offline eagle87

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grey wire connecting to purple wire on ign module
« on: April 28, 2013, 04:28:22 PM »
just wondering what does the grey wire that connects the the purple one on the ign module do? only one of my 87 eagles have this for some reason
2010 Ford Explorer (Red)
2004 Jeep Grand Cherokee Special Edition (Blue)
2002 JeepGrand Cherokee Overland Edition (Silver) Rolled
2001 Cadillac Deville (Silver) Blown Engine :(
1999 Jeep Grand Cherokee Ltd (Graphite) Parts Jeep
1998 GMC Safari (Blue)
1990 Mercury Sable (Red)
1987 Eagle Wagon (Beige)
1987 Eagle wagon (Silver)
1987 Eagle Wagon Limited (Brown)
1986 Eagle sedan (Blue)
1983 Eagle SX/4 Sport (Black)
1982 Concord DL (Maroon)
1968 Rebel Conv (Gold)

Offline carnuck

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Re: grey wire connecting to purple wire on ign module
« Reply #1 on: April 29, 2013, 01:05:48 AM »
IIRC, it was for high altitude
FOR SALE
'87 Comanche 4.0L AW4/NP242 3.73 gears, lifted 5" on near new 33" tires $3500 obo
'82 Eagle Wagon (Brown Betty) 4.2L/727/NP229 and soon 8.25 rear axle and non-vacuum 3.08 front to match. 235/75/15 tires. It's down to minor body work (someone creamed my driver's door but I have another in good shape) almost rust free and interior work (seats are worn and carpet torn). $2000 but about to go up due to more work being done.

Pics of my other for sale stuff http://tinyurl.com/jimsclads

Offline BenM

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Re: grey wire connecting to purple wire on ign module
« Reply #2 on: April 29, 2013, 12:11:07 PM »
The Purple/Orange pair sometimes is connected to the Hall-Effect sensor on the distributor.

With the ECM starting in 1983 it provides a signal to the ICM on one of the wires. The wiring diagram I have shows the orange wire hooked up to the ECM, but either way if it works, it works. The other wire is just power I believe.

When the ECM is used, it connects to the Hall sensor and sends a modified signal to the ICM on it's sense wire, the ECM doesn't need power.

Without the ECM, the purple/orange pair connects to the sensor directly. The sensor has no polarity, so it doesn't care which wire is which. The ECM and ICM do.

1982 (The Concord DL in your sig) should have a yellow grommet ICM with three plugs. The ECM uses the third plug to control the ICM instead of sitting in the middle and pretending to be the sensor.
NSS#47184

1987 AMC Eagle Sedan -- 1976 Pacer Coupe -- 1968 Pontiac Tempest Custom S -- 1940 Mercury (& a 2002 Jetta Turbodiesel, 5 spd., the Wife's Daily Driver)

Offline eagle87

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Re: grey wire connecting to purple wire on ign module
« Reply #3 on: April 29, 2013, 07:26:32 PM »
i think carnuck might be closer to what the wire is, what confuses me is why this particular eagle would have it, as it was sold in ontario canada which isnt high altitude
2010 Ford Explorer (Red)
2004 Jeep Grand Cherokee Special Edition (Blue)
2002 JeepGrand Cherokee Overland Edition (Silver) Rolled
2001 Cadillac Deville (Silver) Blown Engine :(
1999 Jeep Grand Cherokee Ltd (Graphite) Parts Jeep
1998 GMC Safari (Blue)
1990 Mercury Sable (Red)
1987 Eagle Wagon (Beige)
1987 Eagle wagon (Silver)
1987 Eagle Wagon Limited (Brown)
1986 Eagle sedan (Blue)
1983 Eagle SX/4 Sport (Black)
1982 Concord DL (Maroon)
1968 Rebel Conv (Gold)

Offline eagle87

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Re: grey wire connecting to purple wire on ign module
« Reply #4 on: April 29, 2013, 08:35:02 PM »
all other eagles ive seen only use 3 of the wires off the ign module and the 4th is just plugged, is the 4th one this one has the high alt wire then?
2010 Ford Explorer (Red)
2004 Jeep Grand Cherokee Special Edition (Blue)
2002 JeepGrand Cherokee Overland Edition (Silver) Rolled
2001 Cadillac Deville (Silver) Blown Engine :(
1999 Jeep Grand Cherokee Ltd (Graphite) Parts Jeep
1998 GMC Safari (Blue)
1990 Mercury Sable (Red)
1987 Eagle Wagon (Beige)
1987 Eagle wagon (Silver)
1987 Eagle Wagon Limited (Brown)
1986 Eagle sedan (Blue)
1983 Eagle SX/4 Sport (Black)
1982 Concord DL (Maroon)
1968 Rebel Conv (Gold)

Offline BenM

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Re: grey wire connecting to purple wire on ign module
« Reply #5 on: April 30, 2013, 11:16:13 AM »
Do you mean on these connectors?

NSS#47184

1987 AMC Eagle Sedan -- 1976 Pacer Coupe -- 1968 Pontiac Tempest Custom S -- 1940 Mercury (& a 2002 Jetta Turbodiesel, 5 spd., the Wife's Daily Driver)

Offline carnuck

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FOR SALE
'87 Comanche 4.0L AW4/NP242 3.73 gears, lifted 5" on near new 33" tires $3500 obo
'82 Eagle Wagon (Brown Betty) 4.2L/727/NP229 and soon 8.25 rear axle and non-vacuum 3.08 front to match. 235/75/15 tires. It's down to minor body work (someone creamed my driver's door but I have another in good shape) almost rust free and interior work (seats are worn and carpet torn). $2000 but about to go up due to more work being done.

Pics of my other for sale stuff http://tinyurl.com/jimsclads

Offline eagle87

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Re: grey wire connecting to purple wire on ign module
« Reply #7 on: May 02, 2013, 08:00:24 PM »
mines a 2 plug 1988 style with the gm style weather pack connectors, as this is a late 87,  one plug has 2 wires the other 4, however normally the 4th purple wire isnt used on the harness side (as it is on my other 2 87's)
2010 Ford Explorer (Red)
2004 Jeep Grand Cherokee Special Edition (Blue)
2002 JeepGrand Cherokee Overland Edition (Silver) Rolled
2001 Cadillac Deville (Silver) Blown Engine :(
1999 Jeep Grand Cherokee Ltd (Graphite) Parts Jeep
1998 GMC Safari (Blue)
1990 Mercury Sable (Red)
1987 Eagle Wagon (Beige)
1987 Eagle wagon (Silver)
1987 Eagle Wagon Limited (Brown)
1986 Eagle sedan (Blue)
1983 Eagle SX/4 Sport (Black)
1982 Concord DL (Maroon)
1968 Rebel Conv (Gold)

Offline BenM

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Re: grey wire connecting to purple wire on ign module
« Reply #8 on: May 03, 2013, 10:50:23 AM »
Ok. Possibly someone tried to bypass MCU control of the ignition.

Have you seen the mixture pins move in the carb?

How about other signs the MCU is working?
NSS#47184

1987 AMC Eagle Sedan -- 1976 Pacer Coupe -- 1968 Pontiac Tempest Custom S -- 1940 Mercury (& a 2002 Jetta Turbodiesel, 5 spd., the Wife's Daily Driver)

Offline eagle87

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Re: grey wire connecting to purple wire on ign module
« Reply #9 on: May 04, 2013, 10:31:47 PM »
ill dig in the harness more, however this wire appears to be factory (you can see where it had broken off at the plug and had been rejoined), and all the sensors are intact, had feedback carb on it, i temporarily have a non feedback on it
2010 Ford Explorer (Red)
2004 Jeep Grand Cherokee Special Edition (Blue)
2002 JeepGrand Cherokee Overland Edition (Silver) Rolled
2001 Cadillac Deville (Silver) Blown Engine :(
1999 Jeep Grand Cherokee Ltd (Graphite) Parts Jeep
1998 GMC Safari (Blue)
1990 Mercury Sable (Red)
1987 Eagle Wagon (Beige)
1987 Eagle wagon (Silver)
1987 Eagle Wagon Limited (Brown)
1986 Eagle sedan (Blue)
1983 Eagle SX/4 Sport (Black)
1982 Concord DL (Maroon)
1968 Rebel Conv (Gold)

Offline eagle87

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Re: grey wire connecting to purple wire on ign module
« Reply #10 on: May 05, 2013, 10:22:02 AM »
had a closer look at my other 87 and figured out what that wire is supposed to be for! Its the a/c clutch wire grey with black tracer and for some reason a previous owner reconnected it to the ign module (this car never had a/c so it wouldve been just an extra wire) guess they assumed it was ignition related, ill disconnect it from the module since it doesnt do anything! Lol
2010 Ford Explorer (Red)
2004 Jeep Grand Cherokee Special Edition (Blue)
2002 JeepGrand Cherokee Overland Edition (Silver) Rolled
2001 Cadillac Deville (Silver) Blown Engine :(
1999 Jeep Grand Cherokee Ltd (Graphite) Parts Jeep
1998 GMC Safari (Blue)
1990 Mercury Sable (Red)
1987 Eagle Wagon (Beige)
1987 Eagle wagon (Silver)
1987 Eagle Wagon Limited (Brown)
1986 Eagle sedan (Blue)
1983 Eagle SX/4 Sport (Black)
1982 Concord DL (Maroon)
1968 Rebel Conv (Gold)

Offline BenM

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Re: grey wire connecting to purple wire on ign module
« Reply #11 on: May 05, 2013, 06:23:58 PM »
Wow, never would have guessed that!
NSS#47184

1987 AMC Eagle Sedan -- 1976 Pacer Coupe -- 1968 Pontiac Tempest Custom S -- 1940 Mercury (& a 2002 Jetta Turbodiesel, 5 spd., the Wife's Daily Driver)

Offline carnuck

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Re: grey wire connecting to purple wire on ign module
« Reply #12 on: May 06, 2013, 01:44:16 PM »
So it's to kick the RPM up when the AC kicks in?
FOR SALE
'87 Comanche 4.0L AW4/NP242 3.73 gears, lifted 5" on near new 33" tires $3500 obo
'82 Eagle Wagon (Brown Betty) 4.2L/727/NP229 and soon 8.25 rear axle and non-vacuum 3.08 front to match. 235/75/15 tires. It's down to minor body work (someone creamed my driver's door but I have another in good shape) almost rust free and interior work (seats are worn and carpet torn). $2000 but about to go up due to more work being done.

Pics of my other for sale stuff http://tinyurl.com/jimsclads

Offline eagle87

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Re: grey wire connecting to purple wire on ign module
« Reply #13 on: May 06, 2013, 05:29:20 PM »
its the wire that would normally go to the a/c clutch, some wires had melted at the solenoid and i guess they thought it was ignition related since it didnt go anywhere since this car has no a/c
2010 Ford Explorer (Red)
2004 Jeep Grand Cherokee Special Edition (Blue)
2002 JeepGrand Cherokee Overland Edition (Silver) Rolled
2001 Cadillac Deville (Silver) Blown Engine :(
1999 Jeep Grand Cherokee Ltd (Graphite) Parts Jeep
1998 GMC Safari (Blue)
1990 Mercury Sable (Red)
1987 Eagle Wagon (Beige)
1987 Eagle wagon (Silver)
1987 Eagle Wagon Limited (Brown)
1986 Eagle sedan (Blue)
1983 Eagle SX/4 Sport (Black)
1982 Concord DL (Maroon)
1968 Rebel Conv (Gold)

 

which yellow wire to splice MIU upgrade.

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Last post November 22, 2012, 01:22:16 PM
by 84eaglelmz