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Date: 1 Aug 2004 16:54:34 -0700
From: ychennospam30.net (Yaofeng)
Subject: Re: Help! 9000 AERO doesn't pass emiision test


"MK" <MichaelKissnospamo.com> wrote in message news:<YR8Pc.4717$n7.4044nospam.usenetserver.com>... > This is 9000 AERO(1994) with 125K miles- > The emission test shows high NO -on all other aspects the car passed. It > failed only on NO. I need to fix this ASAP. > Q: the car had its head gasket blown- we replaced- later we found that the > Turbo is leaking oil into the exhaust- we replaced the turbo- It has a new > muffler from one of the chain stores. All these repairs were done in the > last 3 months. Is it possible that the catalytic converter is damaged > during the oil leak into the exhaust? And if so is there a way to fix the > problem? > Q: Would a back pressure test on the catalytic converter show if the unit > needs a replacement? > Q: if it is not the catalytic converter what else could cause the problem > with NO only? If your CO and HC readings are within limits, I'd say your cat is okay. I've leaned running lean could cause high NOx. High NOx could also be the result of high combution temperature. Don't know much about the technical stuff. They bore me. Any case, one year by simply changing the spark plugs on my 94 9k cs turbo I was able to lower NOx to acceptable numbers in New Jersey. The old one have the tip almost eaten away by ignition sparks. My 93 Volvo 940 wagon has also just passed the same high NOx emissions recently by simply replacing the O2 sensor. But my 94 9k cs (not the turbo, I have two SAAB 9k's) still has a red sticker for failing, you guessed it, NOx. This is after replacing the spark plugs and O2 sensor. I wish they'd do away with NOx emissions testing in New Jersey.

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