This is the same as using an engine stethoscope; just listen for the sound of the injector popping open. If you have an injector that is not working properly you will be able to hear the difference; all the others will sound pretty well the same.
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'98 E300 DT
'87 190D 2.5 turbo RIP
'92 S500 Sold
'03 3.2TL-S A-Spec
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