Fuel injector resistance reading
#1
Fuel injector resistance reading
When testing my injectors, I get one with NO resistance reading. ?? yes all other 5 show the ohms , but one shows nothing. Tried it different ways. Any one know what is going on. The injector still clicks when the engine starts and though the idle is rough, the engine smooths out over 1500 rpm.
#3
When testing my injectors, I get one with NO resistance reading. ?? yes all other 5 show the ohms , but one shows nothing. Tried it different ways. Any one know what is going on. The injector still clicks when the engine starts and though the idle is rough, the engine smooths out over 1500 rpm.
#5
When testing my injectors, I get one with NO resistance reading. ?? yes all other 5 show the ohms , but one shows nothing. Tried it different ways. Any one know what is going on. The injector still clicks when the engine starts and though the idle is rough, the engine smooths out over 1500 rpm.
Depending on which engine and which injector, you could easily test from another point down the line at another connector to double check.
Hope that wasn't too obvious.
#6
"Shows nothing" as in 0 Ohms or "nothing" as in the meter doesn't do anything? If it's the latter, clean the pins on the injector... get out you precision scredriver set and scrape the corrosion away and try again. The harness connector might make contact since it's been there for a while, but it's hard to get a test from caked pins.
Depending on which engine and which injector, you could easily test from another point down the line at another connector to double check.
Hope that wasn't too obvious.
Depending on which engine and which injector, you could easily test from another point down the line at another connector to double check.
Hope that wasn't too obvious.
#7
Shows "nothing". The pins are absolutely clean. Also there is nothing wrong with the meter as I can just move over to the next injector and I get a proper reading. Its injector number 6. Someone told me the coil may be shorted ?? However the injector clicks when the engine is running. the engine runs rough at idle but smooth over 1500 rpm ?? any one with ideas ?
#9
#10
The DVM i have will read nothing too when the resistance reading is out of range of the selected range the DVM is set on (i.e. if resistance is 200M-ohm+ and DVM is set on 20-100Ohm, display will be all 0's or blank... can't remember which)
#11
Shows "nothing". The pins are absolutely clean. Also there is nothing wrong with the meter as I can just move over to the next injector and I get a proper reading. Its injector number 6. Someone told me the coil may be shorted ?? However the injector clicks when the engine is running. the engine runs rough at idle but smooth over 1500 rpm ?? any one with ideas ?
If the coil is shorted you will read zero ohms, not infinite. But it will have the same effect on the engine.
As mentioned earlier, with the engine running, pull the plug lead for that cylinder, if you don't notice any change in how the engine is running, and you don't get any meter reading on the injector, then I would say 99% chance you have a dead injector.
#12
Another "trick" to check whether the injector is clicking when running. Start your engine and let it idle. Take a long flathead screwdriver (I use an 18inch Craftsman), hold the flathead against the plastic part of the injector. Then hold you ear against the top of the handle. You should hear the injector clicking at a regular interval. You should also be able to feel the vibration of the injector opening and closing. If you do not hear the clicking, your injector is not functioning.
#13
Another "trick" to check whether the injector is clicking when running. Start your engine and let it idle. Take a long flathead screwdriver (I use an 18inch Craftsman), hold the flathead against the plastic part of the injector. Then hold you ear against the top of the handle. You should hear the injector clicking at a regular interval. You should also be able to feel the vibration of the injector opening and closing. If you do not hear the clicking, your injector is not functioning.
That is exactly how I check the injectors to see if they are clicking. it lets you get to all 6 , including the one under the intake.
#14
Yeah, but you better have a good ear. I had to go back and listen a couple of times to realize that enough noise comes back from the other injectors... or at least from one ajoining.
#15
"Shows nothing" as in 0 Ohms or "nothing" as in the meter doesn't do anything? If it's the latter, clean the pins on the injector... get out you precision scredriver set and scrape the corrosion away and try again. The harness connector might make contact since it's been there for a while, but it's hard to get a test from caked pins.
Depending on which engine and which injector, you could easily test from another point down the line at another connector to double check.
Hope that wasn't too obvious.
Depending on which engine and which injector, you could easily test from another point down the line at another connector to double check.
Hope that wasn't too obvious.
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09-22-2015 11:39 AM