Quote:
Originally Posted by olddog
I would assume it ran great for Roush. You are at a different altitude and have different gas. How far would you have to drive to get down to the altitude Roush is at? If easy to do, that would tell you if it was the gas or the altitude.
I had a 1987 Mini Van that use MAP (no Mass flow sensor). Every time I drove it to Florida it would trip a code. The Map sensor had a problem reading the higher pressure at sea level, but it worked fine at the lower range.
From what you said it reminded me of this and makes me suspect a bad MAP sensor, however it doesn't make logical sense. Higher altitude is lower pressure. An engine always runs through the low pressure range, as the throttle closes.
Ask around and see if anyone can test or verify your MAP sensor.
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Roush is in Livonia (Detroit) is about 650'. We are about 5400. It's a ways to get lower. The lowest point in Colorado is 3200' and that's at the Kansas border
The Roush setup does use a MAP sensor to detect base pressure (altitude) but the compensation table that it drives is "null".