Hey Guys (and girls?)
I've had the usual problems with my 2000 Safari Cargo van...the rough idle and misfire that I was experiencing last year turned out to be caused by worn teeth on the distributor shaft, and the fuel pump died and was replaced...so now the gas gauge actually works. So those problems were fixed (YAY) but now I have a new problem...
Last week the van would downshift on inclines at about 55 mph or so, and the check engine light would flash. There would be a noticeable miss in the engine at this time. This would last for a couple miles and then the miss would go away, and the check engine light would disappear after a day or two. Then a few days ago, it did the usual downshift-miss-check engine light routine and it didn't go away. The miss/rough idle is "all the time" now.
I pulled a 0300, 0135, and 0155 code off with my scanner, so I replaced the post-cat O2 sensor...I also replaced the cap and rotor, and air filter. Problem still there...rough idle right from start and misses throughout rpm range. No "rich" odor from exhaust.
When I was trying to diagnose the problem last year with the occasional rough idle and misfire, I replaced the cap and rotor, plug wires, ignition coil, plugs, EGR, and when the fuel pump was replaced the fuel filter was replaced at the same time.
I don't want to throw parts and dollars at this thing again. Anybody got ideas about what's going on here?
Thanks! And btw, great forum! I wish I'd known about it last year...