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post #1 of 6 (permalink) Old 09-27-2006, 06:19 PM Thread Starter
 
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Question Mass air flow sensor??

I was wanting to know if there is a particular reason that my '89 Bird doesn't have a MAF. My intake tube just goes from the filter to the throttle body. I have no idea why there isn't one. The car runs great and the engine and tranny are strong. Thanks for the info. MAC
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post #2 of 6 (permalink) Old 09-27-2006, 06:45 PM
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It's because it has a MAP sensor. Engine vacuum is used to measure the load on the engine instead of directly measuring the volume of incoming air. Just a different design is all.

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post #3 of 6 (permalink) Old 09-27-2006, 06:46 PM
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IIRC it was '89 and early '90 cars that were speed density instead of Mass Air Flow. Your car uses known tables of engine efficiency to run.
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post #4 of 6 (permalink) Old 09-27-2006, 09:11 PM
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Yep, 89-90 3.8L NA MN12's used a speed density (MAP sensor) setup.

89-90 3.8L SC MN12's, and all 91-97 MN12's used a MAF setup.

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post #5 of 6 (permalink) Old 09-30-2006, 01:38 AM
 
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post #6 of 6 (permalink) Old 10-03-2006, 05:45 PM Thread Starter
 
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Thanks for the helpful info. I'll post pics soon with my progress on rebuilding.
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