Check the resistance across the injector terminals with an ohm meter. The resistance should be pretty low, a few ohms, but all manufacturers have their own specifications. Check what the other injectors read for ohms, then compare that with your suspect injector-if way out of range of the others, it is probably bad.
If you put your finger on the injector connector with engine running, you should or might be le to feel it pulse. If you can feel or hear the pulsing, it is probably good, barring any mechanical damage to it. When it pulses, because the computer momentarily grounds that injector's circuit, the injector's pintle on the bottom is raised, allowing fuel under pressure to be sprayed out.
Posted on May 08, 2013
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Posted on Jan 02, 2017
May 10, 2015 | Cars & Trucks
Jun 27, 2014 | 2003 Isuzu Rodeo
Mar 07, 2012 | 1995 GMC Jimmy
Put a long screwdriver directly on the
injector while the car is running. Hold the handle up to your ear. You
should be able to hear a rhythmic clicking sound. If you do, your injector is
good. Hearing a clunk-clunk type noise means you have found your problem. Hearing silence or unusual clicking
patterns means either the injector, wires or plunger may be bad or sticking.
You will either have to clean or replace them.
---------- To know more about fuel injectors and troubleshooting.Please click on the link below:---
http://www.2carpros.com/articles/how-to-test-a-fuel-injector
-------------
Many a times you get black smoke from exhaust due to faulty injectors.Check fuel injectors. Leaking injectors create an overly rich air/fuel mixture and cause black smoke. Take the valve cover off and look at the exhaust part of the injector, when it is running. Each time the injector fires, you should see oil exhausting from it. If you see oil coming out, then the injector is good. When replacing a bad injector, take the glow plug out and crank the engine to get any oil out of the cylinder.----------------- This should help.Thank you.
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