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What are normal MAF values?

abacab

By abacab
in 986 Series (Boxster, Boxster S)

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abacab Member

abacab

Posted
Posted

Hi,

I'm trying to get more information about a P1126 DTC problem (2001 Boxster 2.7L manual) using an OBD-II scan tool that I have. I can see that the long term trim is maxed out on both banks of cylinders at 30%, and from other posts here I can see the potential problems could include a bad MAF sensor, intake leak, exhaust leak, and bad fuel pressure or clogged injectors.

From the scan tool I can see that the MAF sensor is reporting about 3.0 grams/sec airflow at idle (700 rpm) and taking it up to about 7000rpm the MAF reading went up to 55 grams/sec (@60% engine load). Generally the MAF reading in gr/sec was roughly 1:1 (+-10%) proportional with the calculated engine load (e.g. 40 gr/sec at 40% engine load).

To anyone familiar with MAF values does this seem normal or way off? I've seen typical figures for a couple of other cars and they seem to go well over 100 gr/sec airflow, so I'm wondering if these readings directly indicate a bad/under-reporting MAF sensor and whether any particular underlying cause is likely ruled in or out.

Many Thanks,

Bryan

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