makermk Posted September 20, 2020 Share Posted September 20, 2020 I have been working on my 1987 GL off and on for a couple years. It was running and driving fine until one day it up and died. To make a very long story short I'll tell you what I have done and what I have discovered. It ran on occasion, without rhyme or reason, then would refuse to start again. When it would run it ran perfectly. I have checked fuel pump and pressure, MAF, SPFI, spark, spark plugs, coil, cap, rotor distributor, and timing. I have changed out the ignition switch and ECU. Nothing has worked. After doing more research and reading I found out that the ecu has an LED that should light up when power is getting to the ECU. I have just checked and the LED is dark when I try and crank the engine over. Somy question is can anyone help me with tracing down power for my ECU? Please type slowly and use small words, when it comes to the mechanical issues of vehicles I'm fairly competent. Electrical is a different matter entirely. Electricity might ask well be magic, and DC the harder version of it. Any help would be most appreciated. Quote Link to comment Share on other sites More sharing options...
GeneralDisorder Posted September 20, 2020 Share Posted September 20, 2020 When it refuses to start - does it crank and not run, or not crank at all? GD Quote Link to comment Share on other sites More sharing options...
makermk Posted September 21, 2020 Author Share Posted September 21, 2020 It cranks and will sometimes try to run. It may even catch for a few rotations but dies quickly. It will start with starter fluid but as soon as that burns off it dies. And it gets fuel to the injector body. Quote Link to comment Share on other sites More sharing options...
GeneralDisorder Posted September 21, 2020 Share Posted September 21, 2020 Check for power to the injector, and check that you have ground from the driver in the ECU. GD Quote Link to comment Share on other sites More sharing options...
makermk Posted September 21, 2020 Author Share Posted September 21, 2020 The injector clicks when cranking, indicating it has power. How would I check for ground in the ECU? Quote Link to comment Share on other sites More sharing options...
GeneralDisorder Posted September 21, 2020 Share Posted September 21, 2020 Here's a decent video: GD Quote Link to comment Share on other sites More sharing options...
el_freddo Posted September 21, 2020 Share Posted September 21, 2020 If the injector is clicking, have you looked at fuel pressure or the possibility that the fuel pump is dead? Cheers Bennie Quote Link to comment Share on other sites More sharing options...
makermk Posted September 22, 2020 Author Share Posted September 22, 2020 Yes, I have checked fuel pressure and looked at the fuel pump. I believe the problem is that the ECU doesn't have power. And I could use help trouble shoot the cause of that. Quote Link to comment Share on other sites More sharing options...
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