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Re: Urgent HELP!!!
Posted by JohnK (more from JohnK) on Mon, 16 Feb 2004 14:25:46
In Reply to: Re: Urgent HELP!!!, Macy, Mon, 16 Feb 2004 13:31:39
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O-0.75 might be OK. What did you fail for? How close to passing? Older 900t's in decent tune often fail on NOx and pass easily on CO and HC.
Close failures on NOx can often be corrected on turbos by retarding spark to 13-14btdc. A 3.0 fpr might richen the mixture enough to get through, too.
My 90 900t barely gets by on NOx even with new cat and O2 sensor. The culprit is the rrfpr that I have set to run a tad lean at idle. I'm too lazy to hook up the pressure gauge to enrichen the mixture just for the emissions test, so I just retard the spark a bit to get by with ease.
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