Hey list, Some of you may remember I recently had my '82 fail the smog test because of CO emissions that were too high during the treadmill test (CO at idle was OK). Well, I decided to start simple and I replaced the O^2 sensor since the old one was obviously toast. That had an effect, but I'm not sure what it means. Now the car seems to run better overall while in motion and *seems* to have better power while accelerating. But now the idling has gone to crap. All I did was change the sensor, nothing else. The idle is rougher than it used to be, especially when started cold-- it even stalled once on me the other day when I was trying to warm it up. Once it's warm, the idle is still rougher than it used to be but not so bad it stalls. Regular driving it runs great, like I said, maybe better than before. Absolutely no problems or even hints of problems at all. What gives? I know enough about engines and cars in general that I can easily get by working on them as long as I have a FSM, but diagnosing obscure carburetor/vaccum/emission related stuff is my weakness. Now that I have a known-good O^2 sensor, do I just need to adjust the idle speed on the carburetor? I didn't think I should have to do that. Anything I should look into before that? Also, not sure if this is related, but I found I have an exhaust leak somewhere on the passenger side in engine compartment. My guess is the passenger side manifold, but I can't find out exactly where it's coming from. Could this be allowing excess oxygen in during idle and screwing up the sensor's signal causing the roughness? If so, then why wouldn't this affect the way the car runs while driving? How hard is this going to be to track down and fix? ------------------- Nat Hall 1982 Imperial Coupe ------------------- ----------------- http://www.imperialclub.com ----------------- This message was sent to you by the Imperial Mailing List. Please reply to mailing-list@xxxxxxxxxxxxxxxx and your response will be shared with everyone. Private messages (and attachments) for the Administrators should be sent to webmaster@xxxxxxxxxxxxxxxx To UN-SUBSCRIBE, go to http://imperialclub.com/unsubscribe.htm