Runnin' Rich

[CapeCodRovers]

Failed MASS emissions with my '92 RR. Results were:

CO2 at 2390 RPM was 13.6
at idle they were 13.2

CO was 3.05 at 2428 RPM
at idle they were 2.93

HC was a range of 140 to 149

the test failed at CO because the cut point was a 2 and I scored a 3.05 so i'm not sure what the cut point for CO2 was.

I replaced plugs (champions), cap, rotor. O2 sensors were replaced awhile back. The cat rattles something awful and she is running rough, real rough. The battery gets drained within a day or so and its a new spiral cell. I know that is a separate problem but I figured I'd throw it in there. She has 130k on the clock. Any suggestions on how to remedy these problems OTHER than a match and gasoline?

 

[CapeCodRovers]

bump^

 

[goswin]

Perhaps the Mass Airflow Sensor? Clean it with contactspray...

And have you got an OBD2 connector to check the live data coming out of the O2 sensors?

But a RR from 92... it could be the CAT itself, could it not?


Regards,
Goswin

 

[roverover]

Yes you need to get it on a scanner to watch the O2 sensors work. I would say you either have a bad O2 sensor or one or both have become disconnected. I had one get the wires pulled apart and had a similar problem

 

[bovw]

I had a cat doing the same thing. I would replace the cat for starters. I had one done on my D1 for $150 total. Catco 6905 from Summit, local shop welded it in. Much improved running afterword, until the head gasket problem.

 

[CapeCodRovers]

I've cleaned the MAF sensor already and that didn't fix the problem. I was unaware you could cut and weld in new cats, thought I was limited to buying a whole new unit. Summit still has the replacement cats but they only list S.S. under that part number. Any idea what number it is for a regular steel one? How much is an obd2? Thought you didn't need one cause of the display unit under the passenger seat. I know A. British has them but is there a different source for readers that are cheaper?

 

[az_max]

They olny do idle testing here in az, but here are my last three year readings:


2005 (as purchased, no tuneup)
Hydrocarbons (in ppm) 62
Carbon Monoxide (in %) .39


2006 (new lifters, plugs/wires FI clean)
Hydrocarbons (in ppm) 89
Carbon Monoxide (in %) .41


2007 (new cats)
Hydrocarbons (in ppm) 0
Carbon Monoxide (in %) .01


Idle standard

Hydrocarbons (in ppm) 220
Carbon Monoxide (in %) 1.2

 

[CapeCodRovers]

did you weld in new cats or get a whole new unit? I'm trying not to dump too much money in to her cause she isn't worth it at this point. 130k and a rusting frame

 

[az_max]

weld in cats. Catco 6905's, welded in by a friend. $200 total or so.


Take a look here: http://www.discoweb.org/forums/showpost.php?p=397173&postcount=10