Quote:
Originally Posted by porschefan76
OK, quick follow-up. I tested the temperatures of the "pre-cat" (cat on the header) and the temperatures were higher at the outlet end of the cats than at the inlet side, which is promising. I collected Durametric data for the O2 sensors while trying to hold the rpms at ~2000 RPMs for 2 minutes, followed by ~2500 RPM for 1 minute. The data is here:
The post catalytic converter O2 sensors appear to be responding properly, only showing big movements on throttle changes (to me at least. Please tell me if I am incorrect).
I went ahead and acquired a back pressure test gauge and O2 sensor socket and will attempt to check back pressure as soon as I am able. The weather is not going to cooperate this upcoming week.
As usual, thank you all for your time! |
Post cat sensor response may be ok. Not really sure.
Very very difficult to diagnose problems over the internet.
Another issue in diagnosing is that the Durametric expresses data over units of time (bottom axis on the graphs) as compared to frames when you watch something like ScannerDanner's video's. Makes comparing data a little more difficult.
You may want to look at ScannerDanners vids on Catalytic converter efficiency or his vids related to the P0420 or P0430 codes. In most of his vids there are examples of bad and good wave forms on the graphs. May give you better insight then I am giving you
I know you don't have the P0420 or P0430 code but your post Cat Sensor signals still seem a little suspect.
Hope I am not leading you down a wrong path.