hey guys i been lurking the forums for a while. i own a 05 impala its a good car and does good on gas. i was getting 330 miles on a tank on average. well here is the problem, within the last 2 weeks my impala has lost 130 miles of driving range. im basically driving a truck thats how bad it is. i have to fill up every 200 miles:bang::bang::bang:below is a list of what i thought it could be.
1.a bad cat i just had it changed this week and was also having a exhaust leak. it was in the flange so i got both of those taken care off. still bad gas does run a lot better tho and i dont feel the heat of the engine anymore when i open the doors. also not as loud
2. O2 sensor i got the car scanned at o reilys . i was told it was going bad , the one closer to the manifold. if this was the problem what tools would i need to replace it and what would be a good brand ?
3. a tune up, i say this cause the car has 177,000 miles on it and i never had a tune up . i done a bit of research and figured ac delco is the most mentioned on this site . same for the wires but not sure what type of wires i would need.
4. temp sensor / thermostat when i had the car scanned it said thermostat and temp sensor. i have a thermostat just havent put it in yet. i was going to tackle the temp sensor while putting on a new thermostat since they're both close .
i cant think of anything else that could cause this . i used gas from QT by my house and i used it when the QT was brand new. on that one tank i experienced the mpg decline. i thought it was bad gas but then on the next tank it was still not doing good. i filled up using exxon and a bottle of seafoam injector cleaner not a difference. i was really hoping a changed cat would've solved this.
1.a bad cat i just had it changed this week and was also having a exhaust leak. it was in the flange so i got both of those taken care off. still bad gas does run a lot better tho and i dont feel the heat of the engine anymore when i open the doors. also not as loud
2. O2 sensor i got the car scanned at o reilys . i was told it was going bad , the one closer to the manifold. if this was the problem what tools would i need to replace it and what would be a good brand ?
3. a tune up, i say this cause the car has 177,000 miles on it and i never had a tune up . i done a bit of research and figured ac delco is the most mentioned on this site . same for the wires but not sure what type of wires i would need.
4. temp sensor / thermostat when i had the car scanned it said thermostat and temp sensor. i have a thermostat just havent put it in yet. i was going to tackle the temp sensor while putting on a new thermostat since they're both close .
i cant think of anything else that could cause this . i used gas from QT by my house and i used it when the QT was brand new. on that one tank i experienced the mpg decline. i thought it was bad gas but then on the next tank it was still not doing good. i filled up using exxon and a bottle of seafoam injector cleaner not a difference. i was really hoping a changed cat would've solved this.