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My 96 850 T has high readings of HC and CO when tested ... so it fails the E-test we have here.
The mechanic indicated that he thought the engine was running rich and as I have been meaning to do the PVC cleanup overhaul I started there. I thought it was possible that I might have a vacuum leak or something that was not allowing crank case gases to be properly burned.. hence the higher readings.
Without doing the whole job I started by cleaning the MAF and after considerable aggravation was able to get to the PTC "valve" and clean the nipples. There were a few suspect hose issues that I fixed while in there. Finished last Friday and could not do retest until today and found that my average fuel usage over the weekend fell from 10.1 liters/100 kms to 9.2 L/100kms. That's about a quarter gallon of gas every 60 miles. So that was great and I thought that just maybe that was it. NOT SO. Retested today and HC and CO came down a bit but not enough to pass. I am getting no DTCs ... I stupidly cleared them a couple weeks ago (without writing them down) and nothing is showing yet. I am failing at both idle and 2500 RPM.
Todays readings - (2500 RPM) HC- 203 ppm - CO 3.85%
- ( At Idle) - HC 430 ppm CO - 7.85 %
Live Data readings today have not changed anywhere significantly since before the work. If there is some reading there that may be an indicator let me know.
I do get a I/M Readiness reading and both the CAT and EVA icons are Bold and Circled... seemingly indicating a trouble spot.
I have no idea when the Catalytic converter was last replaced ... would a malfunctioning CAT Converter create those kinds of high pollutant readings? As you all know... they are very expensive... so would want to be fairly sure at least.
Anyone out there who has any ideas or experience with this, your insights would be welcomed.
Where to start as priorities and cost? Thanks.
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