00 SE with P0300 (fixed)
Went to start the car this morning and it immediately began to misfire. DTC scan revealed P0300. Usually when I cook a spark plug wire it tells me which cylinder is acting up, but "random misfires on all cylinders" indicates something else is going on.
Primary ignition coils tested at
6/3 = 1.4 ohms
2/5 = 1.4 ohms
4/1 = 1.4 ohms
6/3 = 6.34 kohms
2/5 = 6.37 kohms
4/1 = 6.41 kohms
They're all consistent, but are those within spec? From what I have read elsewhere on this forum the primaries should be about half of that. I did a quick test for vacuum leaks and found none. Haven't tested the plugs or wires yet, they are about 4 years old.
The exhaust smells a little funny so I am wondering if the cat is clogged? Is there a way to determine this? The car has 174k on it and I believe it is the original exhaust (I have owned her since 90k). Car ran great when I came home last night. Prior to today, everyone once in a while the first morning start will idle a little rough, but if I blip the throttle everything smoothed out. She is probably overdue for an O2 sensor, but I don't think that is the cause here.
Any suggestions are appreciated,