Date: Wed, 05 May 2004 23:31:02 -0400 From: cs <> Subject: Help: can't pass emissions - NOX too high
My biennial proiblem is back - can't make it through the Ohio e check with my '88 9000 turbo. For the past two cycles I have taken it in, it flunks, then without doing anything to it, I'll take it back the next day, and it passes (in 2002 they flunked it because they said they couldn't get a reading on it). However, I've a feeling it won't pass this time - the tech told me they just started measuring NOX, and while I'm way under on everything else, the NOX is high. Any suggestions? FYI: this is the 2.0 litre turbo, re-chipped (SAAB issue) to bump it to 175 bhp (from 160). The oxygen sensor was replaced aproximately 4 years ago, and the MAP sensor was replaced ~3 years ago. This car is still a rocket - my 2.3 litre HPT CSE can only keep ahead of it from dead stops, but then any lead is lost on high-speed rolls. I'm wondering if premium fuel might be the culprit - i.e. 93 octane Amoco (re-chipped, SAAB recommends nothing less than 91 octane). Any suggestions?
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