1997 Nissan Sunny Black smoke from exhaust

1997 NISSAN SUNNY
225,000 MILES • 1.4L • 4 CYL • 2WD • MANUAL
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BILALKHAN2078
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I own this car since 1997 it produces black smoke and fuel economy is worse , car doesn't consume oil or water , mechanics say that it's multi air flow sensor is not working properly , please advise me as how to get new maf sensor for my car or please diagnose its problem.
Sep 20, 2015 at 12:54 AM
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MHPAUTOS
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I would first do a fuel rail pressure test as you may have a faulty fuel pressure regulator and get a scan done for any fault codes.
Sep 20, 2015 at 3:21 AM