hey guys i did what was said in the chilton to test a power transistor and it didnt read as it should... question is when i discoenct it it doesnt run at all but connected it runs what exactly does this piece do.. i have searched but no clear answers... i do have a ruf idle and wondering if this the cause i just want an underanding of that this is
99 no lsd, Im in massachusetts. No your car will not function if the main relay is not working. Intermittent problems are something to consider too though, I dont know your symptoms or the issue you are having so I cant offer any more advice.
The power transistor is basically a fast switching transistor that makes and breaks powers to the primary side of the ignition coil. Without it you cannot get the ignition coil to provide high voltage to the secondary winding which happens to feed the distributor. In our cars, the ECU turns the power transistor ON and OFF and that in turn provides ground (or not) to the primary side of the ignition coil.
Before the dawn of high tech electronics in the newer cars, a car used a breaker point inside the distributor which opened and closed with a cam inside the distributor. Mechanics would adjust the point gap and set dwell to provide for proper primary coil functionality. The power transistor replaced both the point and cam and eliminated one mechanical headache.
i have never seen a good test for the transistors ....always test bad ...
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