07-06-2010, 03:33 AM
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#7 |
 Toyota Racing Development Join Date: Apr 2007
Posts: 5,038
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The pigtail coming out of the pre89 GTE TCCS (ECU) is for the HAC sensor (High Altitude Compensation)... it's essentially a clumsy MAP (Manifold Absolute Pressure) sensor which is used to help adjust fueling when there are significant changes in air pressure. You can run without one if you live at sealevel... if you live at a higher altitude you'll be fine too as long as your dialy driving doesn't involve a lot of changes in altitude, but you will be running richer than you need to and your gas mileage will suffer a bit.
I don't to gibberish.... ....except for when I do. 
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