Okay I am still troubleshooting my idle problem and am attempting to rule out the little things. I got my present MAP sensor as part of my supercharger kit, and I believe it to be a 2 BAR Map sensor or at least a 3BAR. For sure its not a 1 Bar. My new chip is burned for a 2 BAR sensor, so I want to make sure this is a 2 BAR.

I googled and none of the #s are matching up.

This MAP sensor has the number 466 stamped on top and that it all. On the flip side in the upper right hand corner there are some small number/letters. PBT-GF30 then on the next line 9576-9.

Any idea if this is 2 or 3 BAR?

God, I would love to get this idle thing worked out before Thursday inspection day.

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87 Fiero GT (3.2 Turbo)
E-mail: david88@peoplepc.com
www.angelfire.com/pa5/davidfiero/

Well, according to the Helm's manual, the stock MAP produces an output voltage of about 1 to 1.5 vdc at idle (max vacuum, zero absolute pressure) to about 4 to 4.5 vdc at wide open throttle (min vacuum, about atmospheric pressure, 1 BAR). I would expect a 2 BAR sensor to provide about the same output voltage range over a pressure range from zero (max vacuum) to 28 PSIA (2 BAR). Therefore, at normal atmospheric pressure (i.e., 14 PSIA or 1 BAR), a 2 BAR sensor output voltage should be midway between the limits above, or about 2.5 to 3 vdc. You could measure this with the engine off (i.e., no vacuum,no boost, atmospheric pressure applied) from terminal "B", light green wire (+) to terminal "A", black/red wire (-) of the MAP connector. A 3 BAR sensor would provide an output voltage under the same conditions of about 2 volts.