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How can i be sure this injector is firing?


Garrett76Zt

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ok so i think that my #2 injector isnt firing, only reason i say this is because while the car is running i pulled off each injector clip one at a time and the car stumbled at every cylinder except #2. When i pull it off the car continues to idle just fine.

 

So i put a screwdriver down to it while its running and it sounds like its clicking away . . .

 

I tested voltage at the clip and it checks out ok . . .

 

I plugged in a noid light and it lights up . . .

 

I swapped the actual injector with #1 injector and its the exact same thing, so its not the injector itself . . .

 

And i drove the car, and its plenty fast and i dont seem to hear any stumble/misfire . . .

 

So am i just making something up? All tests indicate that it should be working except that if i pull off the injector clip nothing happens . . .

 

What gives?? how can i be sure that the thing is working correctly?

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Is it possible to take the injector out of the runner, run the engine and see if it sprays fuel? You don't really have a problem, me thinks.

 

I used to remove the entire fuel rail and trigger the "suspected" injector with a 9 volt battery.

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Guest bastaad525

shouldn't be hard to tell if one cylinder isn't firing (no fuel/spark) the engine will have a very noticeable lope at idle.

 

Try having a look at the tachometer when it's warmed up and idling, then unplug the injector again... the idle should drop, even if it doesn't sound like it stumbles.

 

better yet, use a voltmeter with a built in tachometer function, testing at the coil... that way you'll see even a very slight change in rpm.

 

it might be a sign of an injector that works, but not properly, maybe it's clogged or dirty?

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