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Unread 10-15-2013, 11:24 AM   #16
LeePrather
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1978 CJ5 
 
Join Date: Mar 2013
Location: Jefferson, Ga
Posts: 619
Spark plugs?

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Unread 10-15-2013, 11:43 AM   #17
sailracr
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1985 CJ7 
 
Join Date: Oct 2013
Location: , Florida
Posts: 32
I drove 3 1/2 hours to Tampa w/o issue before "something" happened. Before I left I replaced the plugs, wires, & distributor. A wire, sensor, or computer has failed I think, but which of the many choices it is I have no idea. I know for sure that I have constant 12v on the A0 and B0 stepping motor diagnostic but what is causing it I have no idea. There is some voltage on the O2 sensor (always less than .5v as far as I can tell) but maybe it's bad. I'm thinking to change it just to find out.
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Unread 10-15-2013, 11:50 AM   #18
LumpyGrits
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1985 CJ7 
 
Join Date: Jul 2010
Location: The Mojave Desert Palmdale Ca. U.S.A.
Posts: 4,651
Disconnect the O2 sensor, and see if it runs worst.
If it runs the same. Your O2 sensor is DOA.
LG
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Unread 10-15-2013, 11:53 AM   #19
sailracr
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1985 CJ7 
 
Join Date: Oct 2013
Location: , Florida
Posts: 32
I have disconnected it and there is no change in how it runs or action of the stepping motor. I'll just replace it and post the results.
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Unread 10-15-2013, 12:41 PM   #20
LumpyGrits
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1985 CJ7 
 
Join Date: Jul 2010
Location: The Mojave Desert Palmdale Ca. U.S.A.
Posts: 4,651
Start soaking the area with a penetrating oil NOW. They get really rusted in place.
On the re-install, apply copper anti-seize to the sensor's threads.
IF, this is the issue------Carry a spare O2 sensor with you in your tool kit.
LG
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Unread 10-16-2013, 07:01 PM   #21
sailracr
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1985 CJ7 
 
Join Date: Oct 2013
Location: , Florida
Posts: 32
Thanks to all for the help. I haven't managed to fix it yet but I have discovered that the previous owner has performed the "nutter" bypass meaning that the non functioning stepper motor, sensors, etc are expected. Ahh the joys of buying a jeep from the son of the mechanic who lives in California, rust free but the son knows nothing about the jeep, what's been done, etc. I've managed to get the jeep home so now it's EFI, new ignition, and engine rebuild time. I'm sure I'll ping you all from time to time and I'll post progress pix I go. Looking forward to really "getting to know" this jeep.
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