miata runs rich

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miata runs rich - 7/11/2005 1:14:27 PM    pancette   Posts: 5 Joined: 7/11/2005 Status: offline I have a 1990 miata that seems to run rich There are no codes and the car runs nice but sometimes after a high speed run the cat stinks probably from being overworked. I have replaced the cat and oxygen sensor but still the same problem. The car failed on an emissions test. The tailpipe is sooty.. Any ideas??? Post #: 1

RE: miata runs rich - 7/11/2005 1:59:51 PM    Patrick Posts: 436 Joined: 3/17/2005 Status: offline when was the last time that it had a complete tune up? high mileage? (in reply to pancette) Post #: 2

RE: miata runs rich - 7/11/2005 5:54:49 PM    pancette   Posts: 5 Joined: 7/11/2005 Status: offline It has new plugs, ign wires are good ,air filter new. it doesn't miss 230,000km , compression good (in reply to Patrick) Post #: 3

RE: miata runs rich - 7/11/2005 7:37:28 PM    gtxtreme   Posts: 120 Joined: 5/31/2005 Status: offline Have your fuel pressure tested, could be fuel pressure regulator with leaking diaphram or no vacuum to the regulator. (in reply to pancette) Post #: 4

RE: miata runs rich - 7/12/2005 7:53:02 PM    pancette   Posts: 5 Joined: 7/11/2005 Status: offline My mistake for not checking the emmissions before posting . I will end this thread as the car is ok .Emissions are very low with the new cat (in reply to gtxtreme) Post #: 5

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