The most knowledgeable guy for 82s is Twin Turbo, he may chime in here or some others that have experience with this problem. 
Check Engine Light
Race Director
Joined: Dec 1999
Posts: 16,945
Likes: 9
The most plausible cause would be that someone has changed the 12v switched power lead to a non ignition switched source, either directly to the battery orjunction block right next to it or in the harness between the ecm and fusebox.
The ECM has 2 power leads, an ignition switched main power lead and a ram power lead which is non switched off the junction block, this one is for the ram memory, an orange wire sometimes with an inline fuse. This one seems fine since without it the CEL won't light at all.
Is this something that happened recently?
Is the CEL the only thing that has power to it with the ignition off?? If not, it could also be your ignition switch
The ECM has 2 power leads, an ignition switched main power lead and a ram power lead which is non switched off the junction block, this one is for the ram memory, an orange wire sometimes with an inline fuse. This one seems fine since without it the CEL won't light at all.
Is this something that happened recently?
Is the CEL the only thing that has power to it with the ignition off?? If not, it could also be your ignition switch
Last edited by Twin_Turbo; Jul 13, 2005 at 02:13 PM.
Thread Starter
7th Gear
Joined: Jul 2005
Posts: 7
Likes: 0
Check Engine Light
I'm using a battery disconnect to keep from bleeding the battery.
The car has not been worked on and this started before I installed the disconnect.
It started about six months ago and would go away for a while. Now the light is on when there is battery power and no key in the ignition.
Nothing else is powered with the ignition off.
The car has not been worked on and this started before I installed the disconnect.
It started about six months ago and would go away for a while. Now the light is on when there is battery power and no key in the ignition.
Nothing else is powered with the ignition off.
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