Hi,

I have a 2002 Super crew. The check engine light came on and I had the code read at a local Auto Zone. They told me I had a misfire in cylinder 3. I replaced the plugs and cylinder three plug was loose and plug was rusty as if some water had leaked in. The engine purred like a kitten after plugs were changed. Light went off after plugs were changed and then came back on after a couple of weeks. When I took it back to Auto Zone they are not getting a reading at all. It's as if there is no power at the outlet at all. Truck is still running great. Is there a fuse for this outlet? What could be the cause of not having any power there? Any help would be appreciated....thanks.

Brian

 

check fuses ,specifically the fuse for the power outlet or the cig lighter.

 

If the light is on the pcm sees a problem. The obdII port is self powered and they shouldn't need to connect the scanner to an outside power source. Checking the fuses is a good idea, but I'm not so sure that's your problem as I think the power is from the pcm itself. Don't quote me on that as it's been a few years since I ran across that problem and I don't remember. If there's no communication with the pcm that's also a real issue. Most likely I'd say they didn't know what they're doing or their scanner isn't working. It's common that the pins get jacked up. They use the tool a lot and they're not mechanics.

One last thing, it's also possible that from the rusty plug and all the misfiring that the coil went south finally.