ENGINE: 4-cyl 2.2
Trouble Code: P0420
Losing approximately 1 quart of oil/month (every 2k miles)
No driveway stains - confident we're not leaking much if any
Some dark exhaust staining on the tailpipe exit
KICKER: When I drive the car up to about 3,000 feet elevation, the trouble code goes away and the car maybe even seems less sluggish (could be my imagination on the performance)
I don't know where to go with this other than a CC problem. Any ideas?
sure its a 2.2L? maybe a 2.5L?
ANYWAY that's a lot of oil consumption.....you might look at that- 2002 I think is before the problematic ring issue.
If applicable the turbo when the seals go they consume big time- How do plugs look? do not use a K&N type filter. Use correct T'stat. Check PVC.
you would want to use scanner and check FT's, MAP and ECT - ALSO LOOK AT THE ACTUAL O2 VOLTAGES...
maybe do an exhaust system back pressure test- would look at that sluggish issue...