Ok, I know what the codes are (rich mixture and knock sensor) but was hoping someone might have some more insight (aside from going down the list of everything in the FSM). No noticeable issues when running.
Until just recently the CEL would do the following (now it didn't turn itself off). It could come on shortly after start up AFTER a 50 mile drive and then sitting for 1-2 hours. It would then stay on while driving on the highway, and once I got off the highway, the CEL would go off again. I repeated the process for a couple weeks. 6
About a month or two ago, I'd get a sporadic 25 (unless I misread that code) and 52 but then they both went away until this most recent - didn't really do anything to make them go away other than to jiggle the connectors on both sensors a bit and pull the fuse to reset the diagnostics.
So that said, where would you look first? I want to say the O2 sensors (they were last replaced in 96) but figured I'd see what you all have to say as you have waaaay more experience than I.
Until just recently the CEL would do the following (now it didn't turn itself off). It could come on shortly after start up AFTER a 50 mile drive and then sitting for 1-2 hours. It would then stay on while driving on the highway, and once I got off the highway, the CEL would go off again. I repeated the process for a couple weeks. 6
About a month or two ago, I'd get a sporadic 25 (unless I misread that code) and 52 but then they both went away until this most recent - didn't really do anything to make them go away other than to jiggle the connectors on both sensors a bit and pull the fuse to reset the diagnostics.
So that said, where would you look first? I want to say the O2 sensors (they were last replaced in 96) but figured I'd see what you all have to say as you have waaaay more experience than I.