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1990 740GL can't pass Texas emissions test 700

posted by  someone claiming to be Old Bear on  Sat Feb 28 08:47 CST 2004 [RELATED]

So... first test failed: Hc 214, Nox 1966, CO alright. Replaced sparkplugs, cleaned throttle body and flame trap,set base idle,cleaned ICV, changed O2 sensor (tested bad), changed fuel filter. There were no fault codes. Tested again.....failed: HC 220, Nox 2568. Still no light or codes. Cat replaced 1 year ago from FTP Groton( old one split). There is no EGR valve on this car. I know that this is old grond but any suggestions would be greatly appreciated. I have exhausted the FAQ and search for the first time.

Old Bear
1990 740 GL 8 valve Rex/Regina








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