Hi guys,
I'm the original owner of my teal '95 SE V6, 135K miles, bone stock except for some Stillen brakes.
In the last couple of months I'd noticed some vibration at idle and some slight hesitation at low rpm (<2000) and wide-open-throttle, but lately (seemed to be after one particular fill-up) it's gotten much worse. Now it hesitates, misfires, and bucks at anything above part-throttle when rpm is less than about 2500. Now the CEL comes on intermittently after the car warms up. It tends to go off when accelerating up a hill, but on again after coasting or light throttle.
I bought an EEC-IV code scan tool and pulled these from the stored codes:
176: HO2S BANK 2 indicates lean
332: EGR valve malfunction
I bought and replaced the front bank O2 sensor, which I believe is bank 2 (Hanes guide says cylinders 456 are the ones closest to the radiator, and that's the sensor I replaced).
The O2 sensor replacement didn't cure things by itself, so I took apart the intake shroud and cleaned the MAF, then sprayed an entire can of carb cleaner into the throttle-body. The back of the throttle butterfly was definitely filthy and the carb-cleaner ran black for a while. I tried to clean all passages I could reach with Q-tips, and they came out pretty dirty too.
After I put things back together, I've still got no real improvement in driveability .
What's next? Did I replace the correct O2 sensor?
A lot of folks seem to recommend new plugs/wires for my symptoms, but given the codes thrown does that make sense?
Also let me know any other low-hanging fruit I should grab (e.g. my fuel-filter is pretty old...)
Thanks to everyone, and I really enjoy reading the CEG forums!
---DanQ
I'm the original owner of my teal '95 SE V6, 135K miles, bone stock except for some Stillen brakes.
In the last couple of months I'd noticed some vibration at idle and some slight hesitation at low rpm (<2000) and wide-open-throttle, but lately (seemed to be after one particular fill-up) it's gotten much worse. Now it hesitates, misfires, and bucks at anything above part-throttle when rpm is less than about 2500. Now the CEL comes on intermittently after the car warms up. It tends to go off when accelerating up a hill, but on again after coasting or light throttle.
I bought an EEC-IV code scan tool and pulled these from the stored codes:
176: HO2S BANK 2 indicates lean
332: EGR valve malfunction
I bought and replaced the front bank O2 sensor, which I believe is bank 2 (Hanes guide says cylinders 456 are the ones closest to the radiator, and that's the sensor I replaced).
The O2 sensor replacement didn't cure things by itself, so I took apart the intake shroud and cleaned the MAF, then sprayed an entire can of carb cleaner into the throttle-body. The back of the throttle butterfly was definitely filthy and the carb-cleaner ran black for a while. I tried to clean all passages I could reach with Q-tips, and they came out pretty dirty too.
After I put things back together, I've still got no real improvement in driveability .
What's next? Did I replace the correct O2 sensor?
A lot of folks seem to recommend new plugs/wires for my symptoms, but given the codes thrown does that make sense?
Also let me know any other low-hanging fruit I should grab (e.g. my fuel-filter is pretty old...)
Thanks to everyone, and I really enjoy reading the CEG forums!
---DanQ