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Old 06-18-2017, 09:09 AM
terry.mortimore terry.mortimore is offline
Join Date: Jul 2008
Location: Sault Ste Marie, Ontario Canada
Posts: 210
Default EFII map fluctuations

Hi gang:

I have the dual EFII system and I'm struggling a bit to get the fuel settings dialed in to where I want them.

I now have it programmed so that I get a good start and warm up.

I've noticed on three different occasions that I'll have the RPM/fuel set to where I have AFR readings in the low 13's where I want them only to discover the next time I run the engine a few days later that it will be too lean by quite a bit.

I do put the values lock on each time I have them set, so the fuel numbers have not changed.

The barametric pressure did change quite a bit between the different days.

While running the engine I get a lot of fluctuation showing on the MAP reading on the gauge page. At idle this morning the reading was rapidly changing between 9.8 and 10.5.

At 1750 RPM the MAP was rapidly changing between 16.1 and 17.

By rapidly I mean you can barely read the numbers as they switch back and forth.

Is this normal?

I'm starting to wonder if I have a bad MAP sensor. I thought about switching the MAP sensor from the other ECM but was reluctant to crawl under the dash again.


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