Hi,
I have a 1990 Civic LX sedan with 256K miles. I had a big drop in mpg beginning earlier this year. The mileage got worse but I didn't have the money to work on the car. The check engine light went on once, but didn't store a code. I noticed the spark plugs (bosch platinum) were brown and discolored.
A month ago I had work done on the car. Along with timing belt, valve adjust, some seals replaced, etc., I had the O2 sensor replaced. The car's performance was much improved and the mpg was back to what I was used to - mid 30s. After running a tank of gas through the plug color was back to normal.
I am not sure but I think perhaps this 2nd tank of gas is not nearly as good. I have 1/4 tank left and have only put about 250 miles on the tank, whereas normally I'd have over 300.
Is there something else I shoudl check in regards to this? Obvious things have been covered. I did put in a bottle of Chevron fuel cleaner with this tank, so that may be some of it. I don't want to wreck my new O2 sensor if there is something else wrong that should be addressed.
Thanks,
Derek
Seattle
I have a 1990 Civic LX sedan with 256K miles. I had a big drop in mpg beginning earlier this year. The mileage got worse but I didn't have the money to work on the car. The check engine light went on once, but didn't store a code. I noticed the spark plugs (bosch platinum) were brown and discolored.
A month ago I had work done on the car. Along with timing belt, valve adjust, some seals replaced, etc., I had the O2 sensor replaced. The car's performance was much improved and the mpg was back to what I was used to - mid 30s. After running a tank of gas through the plug color was back to normal.
I am not sure but I think perhaps this 2nd tank of gas is not nearly as good. I have 1/4 tank left and have only put about 250 miles on the tank, whereas normally I'd have over 300.
Is there something else I shoudl check in regards to this? Obvious things have been covered. I did put in a bottle of Chevron fuel cleaner with this tank, so that may be some of it. I don't want to wreck my new O2 sensor if there is something else wrong that should be addressed.
Thanks,
Derek
Seattle