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Car Forum / Saab Cars / August 2004Help! 9000 AERO doesn't pass emiision test
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? > This is 9000 AERO(1994) with 125K miles- > The emission test shows high NO -on all other aspects the car passed. It [quoted text clipped - 9 lines] > 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. gee, are you in Ohio? The bastards just started checking NOx this year, and I hear tell many cars are failing. My '88 9k turbo didn't make it through due to high Nox (everything else was way down), and folks on the list suggested vacuum problems. I checked my lines, and found two to be potentially problematic, so swapped them out for new, but before I could get it back for a re-check, my charging system went out. Now it sits in the drive until I get some fun tickets to work on it. But check your lines. Also, pull your throttle body hose, and make sure the throttle body is clean. Either in the service manual, or in a tech bulletin, I saw Saab saying essentially, that even a thin film of gunk there, can cause raggy idle. My '94 9k CSE is due for a check in April, and I'm expecting the worse, but then Ohio's test program/facilities are a joke - cars go in every other year. My '88 has flunked in 2000 and 2002, and in 2002, they flunked it because there equipment couldn't get a reading on my car. So how did I pass on the re-checks? I merely drove back the following days without doing a thing to the car. >> This is 9000 AERO(1994) with 125K miles- >> The emission test shows high NO -on all other aspects the car passed. It [quoted text clipped - 27 lines] > >I wish they'd do away with NOx emissions testing in New Jersey. CS, I am guessing you are in Cincinnati. We do not get smog checks here in Columbus. Do they verify anything on the stickers? I have a '91 C900 which had EGR. I took it off and installed a '92 ECU which does not have EGR. The thing is that the fender sticker states that it is supposed to have EGR, though. Just wondering if I will have problems when we get smog check here in Cowlumbus. I don't think my '97 9k will have a problem, but we will see. A failed smog check could also be from a bad DI cassette/plugs. Incomplete combustion. I know your '88 does not have that, but your '94 could have a weak one... Keep us posted on the '94 Regards, Keith P.s My dad is in Blue Ash with 2 9ks ('91 and '94) and an '04 9^5. > gee, are you in Ohio? The bastards just started checking NOx this > year, and I hear tell many cars are failing. My '88 9k turbo didn't [quoted text clipped - 48 lines] >> >>I wish they'd do away with NOx emissions testing in New Jersey. Keith, yes, I'm in Cincinnati. the funny thing is on the '88, it runs as hard and as strong as the day I got it 16 years ago - correction, the day I swapped brains in it 16 years ago. I've always heard you should break your car in the way you intend to drive it - I used to make regular runs to Columbus, and while that car still had it's 30 day tag, I was running at 125 chasing an Alfa (I use to have a 'go card,' so getting stopped was not much of a concern). But it infuriates me that the car has had trouble making it thru the E check, especially when I see cars belching black smoke - just wait until you start having to run thru this BS. >CS, > [quoted text clipped - 66 lines] >>> >>>I wish they'd do away with NOx emissions testing in New Jersey. > This is 9000 AERO(1994) with 125K miles- > The emission test shows high NO -on all other aspects the car passed. It [quoted text clipped - 9 lines] > Q: if it is not the catalytic converter what else could cause the problem > with NO only? How quickly was the testing done? The engine need to reach operating temperature an the CAT need to be thoroughly warmed up to do its work. |
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