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Showing results for tags 'mpfi subaru engine ea82'.
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1988 Subaru XT, crazy no spark condition
Hamm3y posted a topic in Old Gen.: 80's GL/DL/XT/Loyales...
I usually don't post to forums that much because I'm pretty good at finding issues and fixing them, but this no spark condition is drive me crazy. I have access to the factory service manual for my car. I was able to use it for the MPFI control unit pin read outs for intense trouble shooting. Condition of ignition system No engine codes in read mode. Crank angle sensor is functional. Tested all 4 wires going to the distributor and it is reaching the MFPI control unit. Tested Coil, it works when I take the negative post and I strike it on the negative side of the battery. Coil is good. 2 Wires going to the Power transistor that is connected to the coil are operational. one is out putting 12V and the other one is a Square-wave from the computer. ( i have pictures of the oscilloscope when I pulled the distributor out and put it on a drill) The only area that I am having trouble with is the power transistor. I tested the ground and it has 0 ohms to the negative side of the battery. I got another junkyard power transistor and it didn't give me spark. Its weird that there is no testing procedure in the 1988 Subaru xt factory service manual for the power transistor. So I either got 2 bad power transistors or the square wave from the computer is not strong enough. Does anyone know how to test a power transistor? *all fuses are fine*