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Unread 09-22-2013, 03:27 PM   #1
JungleComanche
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ASD Relay- 87 Comanche 4L

First post here and needing help!

I have a 1987 4l 6 cylinder Comanche that has been dying while I'm driving. Hit a bump or make a turn and it shuts down. Now it will crank over and start but immediately dies. I can hear the fuel pump start up if the ignition switch is in the right position and I was able to get it home the last time it died by keeping the key in a position just short of cranking.

After much reading and searching the Internet, I am thinking this is the ASD relay. I live at the end of the road in Costa Rica, so I will be removing and replacing this on my own.

1. Where is this relay located for my model and year Comanche?
2. Can I test the relay (once I find it) by replacing it with one I know works?

Thanks a lot.

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Unread 09-23-2013, 07:43 AM   #2
cruiser54
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You have no aSD relay on your 87.

If it were my Comanche, I would be looking for the fuel pump ballast resistor failing or having loose connections. It's located on the driver's side inner fender near the air cleaner. It's okay to bypass it. A photo is posted below.

Since you own a Renix Jeep, I would also click on the link in my signature and do the procedures outlined in Posts 1 through 4.
ballast-resistor.jpg  
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Originally Posted by chris87xj View Post
If you own a Renix Jeep, you'll want to check this out. >

An index to over 25 write-ups can be found in Post #1.

Cruiser's Mostly Renix Tips
My Jeep Technical Photos

http://www.cherokeeforum.com/g/album/1725214
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Unread 09-23-2013, 10:14 AM   #3
JungleComanche
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Quote:
Originally Posted by cruiser54 View Post
Since you own a Renix Jeep, I would also click on the link in my signature and do the procedures outlined in Posts 1 through 4.
Thanks so much for your quick response, cruiser54. Great tips and I will implement 1-4. Most definitely. Oh, and who knew the fuel pump ground is located behind the driver's side tail light!

I have a lot to do today I can see, but I'll check back and let you know how I did.
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Unread 09-23-2013, 12:47 PM   #4
cruiser54
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Keep us in the loop.
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Quote:
Originally Posted by chris87xj View Post
If you own a Renix Jeep, you'll want to check this out. >

An index to over 25 write-ups can be found in Post #1.

Cruiser's Mostly Renix Tips
My Jeep Technical Photos

http://www.cherokeeforum.com/g/album/1725214
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Unread 09-27-2013, 12:07 PM   #5
JungleComanche
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[QUOTE=cruiser54;16240209]You have no aSD relay on your 87.
If it were my Comanche, I would be looking for the fuel pump ballast resistor failing or having loose connections. It's located on the driver's side inner fender near the air cleaner.

Update: I went over all the grounds and wires and many thanks for those tips, Cruiser54. The Comanche is still doing the same thing as before. As for the fuel pump ballast resistor you posted, my Comanche does not have one. So I'm assuming it was bypassed at some point. Where would I look if that is the case?
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Unread 09-27-2013, 03:38 PM   #6
cruiser54
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[quote=JungleComanche;16363857]
Quote:
Originally Posted by cruiser54 View Post
You have no aSD relay on your 87.
If it were my Comanche, I would be looking for the fuel pump ballast resistor failing or having loose connections. It's located on the driver's side inner fender near the air cleaner.

Update: I went over all the grounds and wires and many thanks for those tips, Cruiser54. The Comanche is still doing the same thing as before. As for the fuel pump ballast resistor you posted, my Comanche does not have one. So I'm assuming it was bypassed at some point. Where would I look if that is the case?
Actually, most 87s did not have one. It was a dealer installed fix.
__________________
Quote:
Originally Posted by chris87xj View Post
If you own a Renix Jeep, you'll want to check this out. >

An index to over 25 write-ups can be found in Post #1.

Cruiser's Mostly Renix Tips
My Jeep Technical Photos

http://www.cherokeeforum.com/g/album/1725214
cruiser54 is online now   Reply With Quote Quick reply to this message
Unread 10-07-2013, 12:39 PM   #7
JungleComanche
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Update. Things move slowly in the tropics... but, after checking all the grounds and connections, the truck still would not start. At the suggestion of my wife, I pulled the ignition switch and put it on an electrical tester. Zero current. Zilch. Nada. I sent for a new part and the shop sent a mirror image of the one I needed. Sent it back and today picked up the correct switch. Installed it and BINGO! The truck now starts and... better yet, keeps on running. Thank you all for your comments and suggestions. Jeep Forum Rocks!
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