At 09:46 AM 1/16/00 -0800, you wrote:
Regarding installing a larger MAF sensor. Bruce is right, there is more to it than just installing a larger MAF. The code only recognizes up to 255 grams/sec. So even if you get a maf that will read 500 grams/sec the ecm won't. There are probably some people on this list who could write a patch to make the ecm recognize 510 grams/sec but I am not one of them and it would take a tremendous amount of time.
The MAF doesn't send out a data stream that reads 255g/s It sends out a freq for it's output. I haven't played with MAF's much, but I would ASSUME that a maf that is scaled to 500G/S would have the same max freq as one that is scaled for say 300G/s. That being said, the ECM would still think (and fuel accordingly) to the old MAF flow values... except instead of 300g/s being maxed out, 300g/s is being seen in the ECM as say 200g/s. Same if it's a DC output... they only read 0-5 volts regardless of the max flow capability so you have to reprogram the ECM tables to reflect what the true flow is at each voltage.
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