code reading
Well, I had the battery cable off for the rebuild process, and it didn't make any diffence. The Check Engine light was only intermittent at first - usually coming on when I was coasting downhill, or cruising on flat highway, and going off when the engine was under load (uphill, etc.). Then it started coming on more frequently; cyclically, like it was related to the opening/closing of the t'stat, or perhaps due to heating/cooling cycles of the O2 sensors. Now it comes on after the engine has been running for a few minutes (warms up good), and never goes off.
I'm assuming it's the O2 sensors, given the mileage and recent abuse they've taken (high heat, with periodic bath in antifreeze). I bought two new ones last night, but the truck was too hot to work on, so I blew it off until tonight.
I just found the instructions in the Haynes manual last night for using a voltmeter to read the codes, but it looks like that's a awful kludgy way to read 'em. Do you have a code reader of some kind that's a little easier to use, and if so, where'd you get it and what did it cost?