Calling on 986 Forum Master Mechanics

[JFP in PA]

OK, here ya go:

Good cat:


Bad cat:

[Jager]

Thanks JFP.

I filled my tank with gas that has Techron, and added some injector cleaner, then drove it hard a few times (hit 7K RPMs a few times) that seem to help a little. Here is a snapshot of Bank 1 (no appearance of issues):


And here are a few snapshots of Bank 2:






It seems the catalytic converter on bank 2 is starting to go... Woe is me...

[JFP in PA]

Originally Posted by Jager

Thanks JFP.

I filled my tank with gas that has Techron, and added some injector cleaner, then drove it hard a few times (hit 7K RPMs a few times) that seem to help a little. Here is a snapshot of Bank 1 (no appearance of issues):


And here are a few snapshots of Bank 2:






It seems the catalytic converter on bank 2 is starting to go... Woe is me...

Unfortunately, it would seem so; that last snapshot tells the story as the two sensors are trying to follow each other. Sorry.

[coolbreeze551]

Please excuse my ignorance but how do you know it's the cat and not the o2 sensor itself? TIA

[Jager]

Originally Posted by coolbreeze551

Please excuse my ignorance but how do you know it's the cat and not the o2 sensor itself? TIA

Yeah, I'm not done playing with this... I will probably swap the O2 sensors to see what happens.

BTW the Jägermobile just passed the California Smog Test this afternoon. The hydrocarbon (PPM) was 5 (max allowed is 100 idle, 130 at high RPM) (average for passing vehicle is 17) and the carbon monoxide was 0.00% on both measurements. The %CO2 measured was 14.06 and %O2 measured was 0.5. The Jägermobile is still a clean running machine.

[Jager]

Originally Posted by coolbreeze551

Please excuse my ignorance but how do you know it's the cat and not the o2 sensor itself? TIA

Update, I finally got around to swapping the O2 sensors behind the catalytic converters and no change, I am still seeing the same voltage drops on the O2 sensor on Bank 2... Darn it.

[Jager]

A big THANK YOU! out to JFP for your assistance on this, I learned more about the O2 sensors and catalytic converters... Buy them from Sunset!!