how to diagnose a bad injector.
03-03-2012, 07:53 PM
#3
Re: how to diagnose a bad injector.
Can be done easily if you wanna check for leaking injector. Remove the rail with injectors, prime the fuel pump by turning the key to acc and go look. It would be a good idea to place all injector tips on paper towel so you could see moisture if it drips a little.
If you want to be technical, you need an accurate tachometer, this means digital. Get the motor to normal operating temperature. Unplug each injector at a time seeing how much does the rpm drop. This is injector balance test.
If thats not good enough, get an oscilloscope and compare all 4 injectors. Look for difference in voltage spike. Its normal but abnormally high electrical spike upon activation of injector could Indicate bad injector with higher than normal resistance. You then would test the harness for resistance.
Note: resistance check MUST be performed with device fully unplugged from electrical system.
If you want to be technical, you need an accurate tachometer, this means digital. Get the motor to normal operating temperature. Unplug each injector at a time seeing how much does the rpm drop. This is injector balance test.
If thats not good enough, get an oscilloscope and compare all 4 injectors. Look for difference in voltage spike. Its normal but abnormally high electrical spike upon activation of injector could Indicate bad injector with higher than normal resistance. You then would test the harness for resistance.
Note: resistance check MUST be performed with device fully unplugged from electrical system.
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