Quote:
Originally Posted by scarceller
How old is the Cat? Looking at the report you are not running lean and the HCs are also in check. The most likely case is the Cat is old and likely slightly blocked, this elevates the exhaust temps down stream near the tail pipe and NO numbers will go up.
I suspect you need a new cat.
You are very close to passing, you could try richening up the mixture just a tad as it may bring NO down.
EDIT:
I just saw the CO number, you are running lean. A CO of about 0.1 is lambda (AFR of 14.7) and your down at 0.01
I'd get a reputable shop to setup your mixture properly and I bet you'll pass. Or if you have access to a wideband O2 gauge you can set the mixture yourself.
And as Joe pointed out you could have a small vacuum leak somewhere.
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OK, thank you. I will do the oil cap vacuum leak test this evening. If it's OK, I will have my shop adjust the mixture (I don't have an O2 gauge). The adjustment is basically just the turn of a screw. Is that correct? Hopefully, not too expensive. Hopefully I don't need a new cat...