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1993 Nissan Bluebird 30% reduction in fuel efficiency

Tiny
SAM2013
  • MEMBER
  • 1993 NISSAN BLUEBIRD
  • 180,000 MILES
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.
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Thursday, September 12th, 2013 AT 2:52 PM

3 Replies

Tiny
KHLOW2008
  • MECHANIC
  • 41,815 POSTS
With MAF, the engine is not equipped with MAP sensor.

Is the Malfunction Indicator Light showing and have you checked for trouble codes?
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Saturday, September 14th, 2013 AT 6:57 AM
Tiny
SAM2013
  • MEMBER
  • 2 POSTS
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
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Saturday, September 14th, 2013 AT 7:19 AM
Tiny
KHLOW2008
  • MECHANIC
  • 41,815 POSTS
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.
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Saturday, September 14th, 2013 AT 10:35 AM

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