danielwd
New Member
- Joined
- Dec 23, 2010
- Messages
- 56
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- Vehicle Year
- 1994
- Make / Model
- Ford
- Transmission
- Manual
Initially, I thought the injectors were fine based on an audio test with a stethoscope. I will admit, it was quick test, and the injector that failed was under the intake and difficult to get to with my stethoscope. So, as I said, it was a 'quick' audio test. I finally realized there was a problem with the injector after designing a hook tool with a piece of steel long enough to reach the plug-in from under the upper intake. I unplugged the injector with engine running rough, and there was absolutely no drop in RPM's; whereas, disconnecting the others greatly affected the RPMs. I had been ignoring this one injector because the others were fine and because it was impossible to get access to. Big mistake.FWIW, FoMoCo injectors are not a common failure point. Not saying they don't fail, but it is uncommon. Personally I would not replace them if they are functional. Likely you will not note any change in performance as they are likely functioning to spec.
If you want to do something, you can have them professionally cleaned and checked, removed from the engine and sent off. Some will do the cleaning and poking around for $20 each. Some will even return the injectors along with a flow graph to show how balanced they are after the process.
tom
After removing upper and lower intakes, fuel rail, and testing the injectors, that particular injector had a reading that made no sense. The others were exact.
So I have no doubt it is bad. I have seen on Youtube how to actually apply voltage and make the spray, but I don't think I care enough about that right now. I'm going to put the new injector in and see how the truck does at this time.
I want to thank you and all others for the help and instruction you've provided. I will update soon after I get everything back together.