NoKaOiSURF Posted July 21, 2007 Share Posted July 21, 2007 ok so i changed the ecm, icm, and distributer......still no spark and the tach still jumps all over...what could that be? the wife is getting mad at the $$$$ being spent if can help let me know aloha and mahalos Link to comment Share on other sites More sharing options...
GhostPath Posted July 21, 2007 Share Posted July 21, 2007 ok so i changed the ecm, icm, and distributer......still no spark and the tach still jumps all over...what could that be? the wife is getting mad at the $$$$ being spent if can help let me know aloha and mahalos Check the coil and then check for blown fusible links. Link to comment Share on other sites More sharing options...
NoKaOiSURF Posted July 21, 2007 Author Share Posted July 21, 2007 how do check the coil? i hooked a meter to check resistince on the links and they looked clear Link to comment Share on other sites More sharing options...
GhostPath Posted July 21, 2007 Share Posted July 21, 2007 how do check the coil?i hooked a meter to check resistince on the links and they looked clear The easiest way is with a coil tester. That said, the tach can only jump around if the coil is firing. What condition are your plug wires in, and do you have them (and the coil wire) hooked up properly. Link to comment Share on other sites More sharing options...
88pathoffroad Posted July 21, 2007 Share Posted July 21, 2007 There's a "power transistor" on the coil (essentially a high-speed electronic switch) that the ECU usess to fire the coil. The ECU's circuitry can only handle so much juice, so they used the power transistor to recieve low-voltage (or low-amperage) signals and thereby trigger the coil. You can test that if you're comfy with a voltmeter set to the resistance/ohm setting. I've got to get Acrobat running on my puter again so I can post the info on how to test it, it should be in the EF/EC section of the 94 Pathy FSM if you have a copy. You can get a free copy at phatG20.net if you don't already have one. The info for the power transistor should be good from 90-95, I don't remember what year yours is. Link to comment Share on other sites More sharing options...
GhostPath Posted July 22, 2007 Share Posted July 22, 2007 There's a "power transistor" on the coil (essentially a high-speed electronic switch) that the ECU usess to fire the coil. The ECU's circuitry can only handle so much juice, so they used the power transistor to recieve low-voltage (or low-amperage) signals and thereby trigger the coil. You can test that if you're comfy with a voltmeter set to the resistance/ohm setting. I've got to get Acrobat running on my puter again so I can post the info on how to test it, it should be in the EF/EC section of the 94 Pathy FSM if you have a copy. You can get a free copy at phatG20.net if you don't already have one. The info for the power transistor should be good from 90-95, I don't remember what year yours is. I'd forgotten about that - yeah, that transistor is probably fried, too. The ECU is trying to fire the coil, but the transistor isn't tripping the coil - and it's doing weird things too. Link to comment Share on other sites More sharing options...
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