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I have been using one for a little while now and am curious as to what some other people are getting for readings during acceleration, cruise at various speeds, etc.
i would be interested in comparing numbers. granted I live 5000 feet above sea level. but my 88 pulls 17" at idle (not uncommon around here) cruising in 4th at 55 it sits at 10", and at 65 in 5th it pulls 7". if i wind it up to 75 it only pulls around 4". I'm worried that by then im tapping into the acceleration circuit. making me waste even more fuel.
Did the 88 not come with factory EFI? I thought that by then all Ford light duty engines were bank-firing MAP-controlled EFI. Anyway, if it is carb'd, it it high-altitude calibrated emissions? If not, it may be opening up the power valve at four inches and wasting fuel.
Im at 6000ft MSL, but had EFI on everything starting with the '88 Ranger.
yeah, its efi, but even efi has a "power enrichment circuit" similar to a power valve, it goes into open loop and feeds a specified mixture instead of listening to the o2 sensor. I know it does it with your foot on the floor, but i'm not sure where it would kick in as far as vacuum goes.
So, enrichment it may be triggered by manifold pressure (aka vacuum) or throttle position. Both are sensor inputs to the PCM. We just dont know which one.
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