Still trying to verify injector problem. Testing voltage with engine running, grounded to body, gave me 13+ volts.

I have eliminated all possible causes of no fire other than injector. As mentioned above I verified injector firing and fuel squirt with 9V battery, but still have dead cylinder. This weekend I am going to pull the intake plenum and switch two injectors to see if the problem moves.

Why would injector fire with 9V battery but not fire with system power? I have verified that computer is switching with noid light.

92 Montero LS 3.0L V6 Auto, Stock, Original owner, 185,800K miles