My kingdom for the person that can successfully diagnose Excalibur!
I've had the same problem with my 03 GX with 170000 miles on it for months. The dealer took 3 stabs and almost $1000 at it, and didn't fix the problem. An independent mechanic with Identafix helping out threw $700 at it, and no dice either.
I keep getting misfires in the 1800-2000 rpm range, mostly when cold, and seemingly worse at high altitude (I live at 5000 ft. and commute down the hill). Once warmed up, the car runs great. The dealer replaced all sorts of spark plugs, fuel injectors, coil packs, etc. and each time they "fixed" it, the car ran perfectly for about a week, then the same misfiring problem started again. The independent mechanic replaced the fuel injector driver unit, and that didn't fix it either. Today, the fuel pump started blinking and the gas level went to 0 (2nd time), but the car ran fine. The MIL is not on yet, but here are the pending codes and sensor readouts from my OBD-II scanner:
P300 (pending) - misfire
P301 (pending) - misfire
P302 (pending) - misfire
P303 (pending) - misfire
Emission Monitors:
Misfire
Fuel
Comp. (?)
Catalyst
O2 sensor
O2 heater
I'm open to suggestions - so far I've heard that my O2 sensor could be dying, but usually that would throw a code...
I've had the same problem with my 03 GX with 170000 miles on it for months. The dealer took 3 stabs and almost $1000 at it, and didn't fix the problem. An independent mechanic with Identafix helping out threw $700 at it, and no dice either.
I keep getting misfires in the 1800-2000 rpm range, mostly when cold, and seemingly worse at high altitude (I live at 5000 ft. and commute down the hill). Once warmed up, the car runs great. The dealer replaced all sorts of spark plugs, fuel injectors, coil packs, etc. and each time they "fixed" it, the car ran perfectly for about a week, then the same misfiring problem started again. The independent mechanic replaced the fuel injector driver unit, and that didn't fix it either. Today, the fuel pump started blinking and the gas level went to 0 (2nd time), but the car ran fine. The MIL is not on yet, but here are the pending codes and sensor readouts from my OBD-II scanner:
P300 (pending) - misfire
P301 (pending) - misfire
P302 (pending) - misfire
P303 (pending) - misfire
Emission Monitors:
Misfire
Fuel
Comp. (?)
Catalyst
O2 sensor
O2 heater
I'm open to suggestions - so far I've heard that my O2 sensor could be dying, but usually that would throw a code...
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