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Old 03-31-2005, 02:08 AM
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what is a power transistor

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
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Old 03-31-2005, 02:53 AM
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A Transistor is a switch, maybe theyre referring to the main relay?

BTW I have an auto transmission with 55k if you are interested..
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Old 03-31-2005, 02:55 AM
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how much what year and is it lsd and will my car funstion with a malfuntioning main relay
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Old 03-31-2005, 02:57 AM
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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.
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Old 03-31-2005, 02:59 AM
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thanks anyway so whats ur asking price
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Old 03-31-2005, 03:27 AM
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The power transistor is the light grey (on my '93 IIRC) plug that's mounted I believe on the brass looking metal plate that is just past the MAF....(can't picture it very clearly right now)....

Jeremy
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Old 03-31-2005, 10:02 AM
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i know where it is and wha it is but what exactly does it do
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Old 03-31-2005, 04:40 PM
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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.

If the engine runs whatsoever then it is working.
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Old 03-31-2005, 07:46 PM
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so then why when dpomg the test according to the chilton manual mine should be faulty and yes i know how 2 use a multi meter i went to electronics school
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Old 03-31-2005, 08:34 PM
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Double check the test with this http://www.autozone.com/servlet/UiBr...3d801b5c90.jsp
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Old 03-31-2005, 08:59 PM
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same test i did and i failed it
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Old 03-31-2005, 09:07 PM
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i have never seen a good test for the transistors ....always test bad ...
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Old 03-31-2005, 09:16 PM
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so then should i replace it?
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