SHOW ME what a bad injector looks like.. - Dodge Cummins Diesel Forum
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post #1 of 23 (permalink) Old 01-25-2011, 11:55 PM Thread Starter
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SHOW ME what a bad injector looks like..

Doing my nozzles in a weekend or two with a good friend whose a diesel nut, but not a certified tech or anything. Hes done a handful of 2nd gen 24v injectors, 12v work, fuel systems, turbos, etc.

Anyhow, were doing the nozzles soon. I do not know what an injector rattle or bad injector sounds like, my first diesel. I've read plenty about cracking injectors from RP (IE: MP8) etc. So my question here is, besides taking the injectors out, installing nozzles, driving 2 hours to the closest place that flow tests (waste a half a day) Is there a physical way I can look at the injectors after I clean them up really good and say WOAH this ones going bad, like is a bad injector visible I guess is where I am getting at..

I have no symptoms.. no white smoke on start up, no diesel fuel in my oil, no rough starts no bad idle, but I got a rattlin diesel engine under the hood, and I just want to cover all my bases here.


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post #2 of 23 (permalink) Old 01-26-2011, 12:23 AM
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lets see i have had 4 sets go bad and they never showed anything visible

Really don't give a rat's App**
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post #3 of 23 (permalink) Old 01-26-2011, 12:26 AM
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There really is no way to look at an injector and say for certain that it is bad unless it is blown all to hell. And i mean it is missing chunks or there is a definite crack in it. The holes for the diesel to flow through are so small that you cant put a needle through one. The only way to really know is to take them out and have them tested. A buddy of mine has a really expensive code scanner and he can tell me which one is not performing correctly. Thats only if its running so bad that it throws a code. My powerstroke i couldn't tell when one injector went out, so much. But when two went out there was a definite miss in the idle and white smoke. When the third one went out when i went to buy the injectors, there was a cloud of smoke behind me.

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post #4 of 23 (permalink) Old 01-26-2011, 12:45 AM
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Like the others are saying the only true way would be to get them tested. I know you're saying you don't want to do it but you will have to, to find out for sure. Have you considered whole new performance injectors inside of tips?

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post #5 of 23 (permalink) Old 01-26-2011, 07:50 AM
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A quick test is to measure the resistance with a multimeter. Anything over 1 ohm and most likely the injector is bad. I tested mine this way and all but #5 were 1 ohm or less. #5 was 2.6 ohms (hot) and 2.1 ohms cold.

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post #6 of 23 (permalink) Old 01-26-2011, 08:59 AM
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if you see this.... you have problems




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post #7 of 23 (permalink) Old 01-26-2011, 09:30 AM Thread Starter
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Quote:
Originally Posted by machineman View Post
A quick test is to measure the resistance with a multimeter. Anything over 1 ohm and most likely the injector is bad. I tested mine this way and all but #5 were 1 ohm or less. #5 was 2.6 ohms (hot) and 2.1 ohms cold.
Can you tell me more about how you did this?


And as far as buying new injectors to the other post, got the nozzles for a heck of a deal, so can't really afford the huge pricetag of new injectors

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post #8 of 23 (permalink) Old 01-26-2011, 01:13 PM
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Quote:
Originally Posted by slickcav View Post
Can you tell me more about how you did this?


And as far as buying new injectors to the other post, got the nozzles for a heck of a deal, so can't really afford the huge pricetag of new injectors
Disconnect the valve cover gasket and remove. Set your multimeter to Ohms and check the terminals at the top of each injector.

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post #9 of 23 (permalink) Old 01-26-2011, 01:52 PM
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Quote:
Originally Posted by machineman View Post
Disconnect the valve cover gasket and remove. Set your multimeter to Ohms and check the terminals at the top of each injector.
If your going to ohm out the injectors you need to take the wires off first.

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post #10 of 23 (permalink) Old 01-28-2011, 11:21 AM
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Quote:
Originally Posted by fixmedaily View Post
If your going to ohm out the injectors you need to take the wires off first.
That is why I said to disconnect the VCG and remove. Once you do that, there are no wires connected to the injectors.

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post #11 of 23 (permalink) Old 01-28-2011, 11:26 AM
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nah

Testing the resistance only tests the solenoid. You can have a good solenoid with a cracked injecor.

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post #12 of 23 (permalink) Old 01-28-2011, 02:17 PM
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Quote:
Originally Posted by trekbikedude View Post
Testing the resistance only tests the solenoid. You can have a good solenoid with a cracked injecor.
True. I was just giving him something to start with.

If they all check fine as far as resistance, then you will have to send them out to get tested.

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