AntonioCole
New Member
Lately I've been getting poor gas mileage. As in, under 25 on the highway. I've got no service lights. I did get an O2 sensor code last year, but I cleared it and it never showed again. The car has about 135k miles on it.
I have new spark plugs (<15k miles on them). My tires are inflated properly. I had the VANOS cam bolt warranty work performed last year, and no codes have been thrown since then, so I assume they did the job correctly. I did have to replace the starter, and I put new intake gaskets on the intake manifold (everything torqued to spec). The valve cover gasket has been replaced with the VANOS cam bolt warranty.
I change my oil every 8k miles or so. There isn't any sludge in the engine.
Whats the next steps that I should take to determine what the issue is? Should I just change out the O2 sensors since they're high mileage? Is a compression test in order (but wouldn't that throw a code)? All of the spark plugs are gapped properly, and there isn't any misfires.
Every now and then, I do notice that the engine likes to rev a little bit up and down around idle when I'm at a traffic light, which makes me think that the engine might be running a little lean. Without a code, though, I have no idea how to tell if it is or not.
I have new spark plugs (<15k miles on them). My tires are inflated properly. I had the VANOS cam bolt warranty work performed last year, and no codes have been thrown since then, so I assume they did the job correctly. I did have to replace the starter, and I put new intake gaskets on the intake manifold (everything torqued to spec). The valve cover gasket has been replaced with the VANOS cam bolt warranty.
I change my oil every 8k miles or so. There isn't any sludge in the engine.
Whats the next steps that I should take to determine what the issue is? Should I just change out the O2 sensors since they're high mileage? Is a compression test in order (but wouldn't that throw a code)? All of the spark plugs are gapped properly, and there isn't any misfires.
Every now and then, I do notice that the engine likes to rev a little bit up and down around idle when I'm at a traffic light, which makes me think that the engine might be running a little lean. Without a code, though, I have no idea how to tell if it is or not.
