Hey,


Truck had a rich on bank 2 code about a month ago, I cleared it and the service engine light stayed off for quite some time.

Last friday on the way home from work the truck started shaking badly right from idle, and at one point on the freeway the service engine started flashing. I couldn't pull over as I was on a bridge but once I dropped my speed the light stayed on but the flashing stopped.

I went to plug the truck in today and first shot it didn't communicate with the code reader at all, I talked to someone who told me that the cigerette lighter fuse is also the OBD port fuse, I pulled a fuse from somewhere else and plugged the reader in again. This time it started communicating with the truck but didn't display any codes while all the while the truck is miss firing and the service engine light is lit up on the dash.


one other weird thing:
the fuse had an LED indicator to show that it is blown, when I push the cig lighter in the led gets a hell of a lot brighter, if there is always power drawn through the circuit shouldn't the LED be constantly bright all the time? I'm wondering if there is a short somewhere



Anybody have any ideas where to look next??

 

I wouldn't read too much into the LED glow. It could be a weak connection. I would get the ol haynes manual out and check connectivity through the OBD2 circuit. A good meter helps here.

 

took the truck to my buddy at ford today and his scanner hooked up just fine. I got p0172 (rich on bank 1)
p0174 (lean bank 2)

and it looks like a misfire on cyl.8