Hi all,
My son has a '96 Trooper with the 3.2 V6. Mileage is poor about 10 mpg in around our hills, around town, zero Freeway. He is a new driver and could also be treating the acclerator pedal a little aggressive.
When we got the vehicle, I found a bad ignition coil on the drivers side. It was pulling a mis-fire CEL code and I traced it down. That is fixed. After I fixed the mis-fire code, I was able to clear all the codes and the vehicle passsed our CA smog test. My friend who gave us the vehicle said the CEL light had been on for close to a year and a half.
The P0430 bad cat code has come back. I think the mis-fire probably ruined the cat, but it did pass smog. Engine runs smoothly and has about 120K on the odometer. As far as I can tell, none of the O2 sensors have been replaced.
My approach would be to replace both upstream O2 sensors, and the rear stream O2 sensor behind the bad CAT. Clear codes and see what happens.
If the cat was "ruined" (showing below efficiency) would the mileage be effected? Or is mileage more likely effected by worn out O2 sensors.
No other CEL codes have been thrown, other than the mis-fire when I got the vehicle and the P0430 bad cat code.
How would you approach this repair?
Thank you in advance.
My son has a '96 Trooper with the 3.2 V6. Mileage is poor about 10 mpg in around our hills, around town, zero Freeway. He is a new driver and could also be treating the acclerator pedal a little aggressive.
When we got the vehicle, I found a bad ignition coil on the drivers side. It was pulling a mis-fire CEL code and I traced it down. That is fixed. After I fixed the mis-fire code, I was able to clear all the codes and the vehicle passsed our CA smog test. My friend who gave us the vehicle said the CEL light had been on for close to a year and a half.
The P0430 bad cat code has come back. I think the mis-fire probably ruined the cat, but it did pass smog. Engine runs smoothly and has about 120K on the odometer. As far as I can tell, none of the O2 sensors have been replaced.
My approach would be to replace both upstream O2 sensors, and the rear stream O2 sensor behind the bad CAT. Clear codes and see what happens.
If the cat was "ruined" (showing below efficiency) would the mileage be effected? Or is mileage more likely effected by worn out O2 sensors.
No other CEL codes have been thrown, other than the mis-fire when I got the vehicle and the P0430 bad cat code.
How would you approach this repair?
Thank you in advance.