Thread: Sensors

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Ther is a sensor. Not sure at the moment what it,s call. It tells the fuel injectors when and much gas to put in the intake according to how far open the flap in the thotle body is. Could this sensor malfunton at times giving a fause reading. But not puting the engine light on. Maybe not telling the fuel injectors the right thing? Thanks, John

the sensor you are thinking of is the TPS = Throttle Position Sensor, which works together with the MAP sensor = Manifold Absolute Pressure... to check the TPS, there should be 3 wires, tpin and connect a scopemeter to the middle and top or bottom sensor and set it to check resistance, resitance should change in a constant sweep as you move the gas pedal, if there is any break in the resistance it means that there is a worn spot in sensor..... the MAP sensor could also be dirty, it will be on the intake piping, a rectangular box with i believe 6 wires on that car, take it out and clean the sensor tip with electronic cleaner, be sure to be careful the little wire in there is very fragile.... i really doubt it would be transmission related.... but also to clean those injectors better you can take them out and hold them upside down and lightly tap them on a bench, they have little screens to catch particles..... make sure to replace the o rings if you do take the injectors out.... another thing could be fuel pressure, the regulator could be going out.... to find the regulator trace down the fuel rail and fuel line to find a little device with a vaccum hookup... you can disconnect the vaccum line and plug it to give full fuel pressure all the time... its not so much pressure it will damage anything and it might even give you a little bit more pep

The regulator. Might have somthing there. I don,t think anybody at these auto repair shops have thought of that. Just disconnect and plug up the vacum. Might do just that. Also, If I happen to be out and the car acts up again. What might be some quick fix things I can try just to get the car home. Or at lease out of the road. Thanks John. Also, I.m still perflex about the issue of a sensor working sometimes and not working sometimes. Also does anyone have a time machine so I can go back to 1970? LOL. Thanks, John.

nope no time machine sorry..... ussually an intermittent sensor would be caused by an exposed wire that shorts sometimes or a loose connection.... or maybe a resistor that is heating up and shorting out when it gets hot.... the pressure regulator was a trick that gm was telling mechanics to modify if experiencing problems similar to yours, they told us to tap an indentation into the regulator with an 11/16 socket to crush the spring a bit and keep the regulator open just a little more..... its not in any books, but mr goodrich gave us a memo about it