ricasso

Well, I've changed all the wires and plugs on my 94, all the valves are working right so I'm guessing what seems like a misfire is down to an injector, I've put a stethoscope on them all and they all sound like their firing, but that dont mean there's fuel being injected, so what I'd like to know is can I take them out one at a time to see which one is bad (not injecting) or is there a better method?

Cliff Harris

The usual method is to remove and raise the injector rails, keeping everything intact. Then pressurize the rails and look for leaking injectors.

jph46

Just replaced mine on a 93 LT1. I checked the injectors with a OHM meter, 3 of the 8 where out of spec's. Went with the Bosch III from FIC, runs great and fires right up.

Mohammed_z

Whats good injector reading for '94 ?

jph46

Not sure if the 93/94 are the same! My good ones where all between 12.5-12.7 ohms. The bad where 10.6-11.1ohms. I believe what you want to see is a reading close to each other.

Cliff Harris

The absolute reading isn't as important as that all the readings are within one ohm of each other. That removes any variables like the calibration of your meter and the resistance in the test probes. For example, these are the readings I got on my '86 with the older style injectors:

My recollection is that they changed to saturated style injectors in 1994, so those read lower by 3 or 4 ohms.