1993 Nissan Bluebird 30% reduction in fuel efficiency

1993 NISSAN BLUEBIRD
180,000 MILES
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SAM2013
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The car has a hesitation at slow speeds but seems to run ok and has good power at higher speeds

I have changed the O2 sensor, both temperature sensors and new plugs.

I have had nothing done to the Mass airflow sensor or throttle position sensors.

Any ideas as to what could be causing the massive fuel usage?

Where is this MAP sensor located? Never heard of it before.
Sep 12, 2013 at 2:52 PM
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KHLOW2008
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With MAF, the engine is not equipped with MAP sensor.

Is the Malfunction Indicator Light showing and have you checked for trouble codes?
Sep 14, 2013 at 6:57 AM
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SAM2013
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no the engine light ia not on.
I do not have the tools to check codes
of note the distrubutor and ECU were changed since the problem.
the air intake ducting
and filter box also changed because of breaks
Sep 14, 2013 at 7:19 AM
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KHLOW2008
  • ✓ASE Certified Mechanic
  • 41,814 POSTS
  • ASE Certified Mechanic
https://www.2carpros.com/articles/nissan-obd1-diagnostic-trouble-codes-and-retrieval-procedure-1984-to-1994

Go to above link for information how to check for trouble codes.
Sep 14, 2013 at 10:35 AM
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