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Old 05-24-2011, 11:44 AM   #1 (permalink)
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How to check injectors

I know I have found all the information I am asking for now in other threads on various other days, but today I am having no luck.

I am pretty sure I have an injector going bad. I will be taking the truck to a friends shop tonight to look into the problem. The question is what am I looking for? What kind of pressures need to read where. What do I test and how do I test it? Any and all info is appriciated and needed.

Again sorry for asking for info that is listed in 100 different places, but like I said today is the day I need the info and I am having no luck finding it.

Thank you
Brandon
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Old 05-24-2011, 12:11 PM   #2 (permalink)
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I would pull them & send them to be tested and be done with. If you have one bad then others should have the same wear on them. I know guys that have chased 1 injector after another over a long period of time trying to save a buck! You need to find a certified Bosch test facility & have it flow tested. That's the only way to get them balanced ( spray pattern, shimmed, return rate etc..
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Old 05-24-2011, 01:17 PM   #3 (permalink)
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Thank you and that is what I will do. For now though I need to know if there is a way to check them and find out which one or two or however many are bad and replace it or them. I know this is not ideal but it is what has to happen tonight. After the weekend I can get them all removed and checked properly. So if someone knows how to check these and can give me that info that would help. I am looking for pressure readings that can be checked or a pull and check method some info of some sort.

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I would pull them & send them to be tested and be done with. If you have one bad then others should have the same wear on them. I know guys that have chased 1 injector after another over a long period of time trying to save a buck! You need to find a certified Bosch test facility & have it flow tested. That's the only way to get them balanced ( spray pattern, shimmed, return rate etc..
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Old 05-24-2011, 01:27 PM   #4 (permalink)
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If you can get your hands on a scanner that reads the rail pressure then you can start there. But like firemanram said the best way is to remove them and get them tested on a bench. A injection shop with a proper bench can give you better feed back then any in truck test, or even a pop test for the nozzles.
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Old 05-24-2011, 01:45 PM   #5 (permalink)
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Removing CR injectors for visual inspection usually won't yield much for results. If I were to pull them it would be to send them off for proper testing and repair if needed. That's why you are not finding information about testing them. You can't do that yourself without the test gear.
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Old 05-24-2011, 03:45 PM   #6 (permalink)
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The guy is supposed to have a scan tool that can get me started. I am just looking for some numbers that the injectors are supposed to be at so we know what we are looking at. I have found a diesel shop in the area that can check the injectors for me I would just like to have some sort of idea before I take them in. Also if the injectors are fine do they need to go back in the same cylinder they came out of?

Thanks for the help!
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If you can get your hands on a scanner that reads the rail pressure then you can start there. But like firemanram said the best way is to remove them and get them tested on a bench. A injection shop with a proper bench can give you better feed back then any in truck test, or even a pop test for the nozzles.
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Old 05-24-2011, 05:23 PM   #7 (permalink)
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If your truck wouldn't start the rail pressure would be good to know because if it's below somewhere around 4000psi the ecm does not tell the injectors to fire.
That could tell you you have a leaking injector.
Not you case

The scan tool isn't going to tell you anything regarding a bad injector. Check engine light? Codes help for other things but not injectors on these trucks. Even if you had low WOT rail pressure it doesn't neccesarily point at injectors.
As mentioned numerous times above you have to send them to a shop with the HPCR injectore testing machine.

Why do you think you have a bad injector?
Do you have any smoke at cold engine start up?
Does it idle rough?
Does the engine come down in rpm very "choppy"?
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Last edited by waywardtravel; 05-24-2011 at 05:25 PM.
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Old 05-24-2011, 05:30 PM   #8 (permalink)
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I guess a better question for me to ask would be how to tell if I have a bad injector vs say a bad head gasket. I have white smoke at startup. There does not seem to be any rough idle or choppy rpm when coming down. The white smoke is only there at startup and goes away within a minute. It is a rather large amount or white smoke and does this even with outside air temps above 80 degrees. I do think I am hearing a louder than normal rattle when I am accelerating.

I do appriciate all the help you guys are giving me. So please bear with me.

Thanks
Brandon

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Originally Posted by waywardtravel View Post
If your truck wouldn't start the rail pressure would be good to know because if it's below somewhere around 4000psi the ecm does not tell the injectors to fire.
That could tell you you have a leaking injector.
Not you case

The scan tool isn't going to tell you anything regarding a bad injector. Check engine light? Codes help for other things but not injectors on these trucks. Even if you had low WOT rail pressure it doesn't neccesarily point at injectors.
As mentioned numerous times above you have to send them to a shop with the HPCR injectore testing machine.

Why do you think you have a bad injector?
Do you have any smoke at cold engine start up?
Does it idle rough?
Does the engine come down in rpm very "choppy"?
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Old 05-24-2011, 09:16 PM   #9 (permalink)
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If you smell raw diesel in the white smoke you have a bad injector. Back to having them tested. You can read of countless burned pistons from overfueling injectors.
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Old 05-24-2011, 11:58 PM   #10 (permalink)
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coolant level dropping?
champagne like bubbles in radiator fill hole coolant?
yes =s probable head gasket

but with just an exhaust brake and no boy toy modes, chance of blowing a head gasket in a 5.9 is next to none.

as wayward said, get the injectors tested by a professional injector test lab. Not the long armed monkey down at Joe's Diesel and Greasy Grill

you're messing with an engine killer, leaking injector nozzles
inj. testing has a far higher ROI than just running it.
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Old 05-25-2011, 10:04 AM   #11 (permalink)
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Thanks guys for the help. I would like to point out that i am not driving the truck all over hell waiting for answers. The truck is parked until I understand the most logical steps to take. I am within 30 minutes of a great diesel shop that can do the injector test for me. I just wanted to rule out other problems before I pulled the injectors. Can someone give me costs of what the tests run in their area for the injectors?

Thanks
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Old 05-25-2011, 10:34 AM   #12 (permalink)
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Not doubting them but ask them how they test the injectors. They can be tested on any machine for spray patern but tip failure and the solenoid and return rate can only be tested on the correct HPCR machine. These thing's fire three times per stroke.
I am living in Panama and nobody in the country has the machine for the cummins bosch. My regular shop here said he would have to repair for Venezuala, Columbia, Panama, and Costa Rica to justify the machine. I have read it cost's about $200.00 to have them tested in the states.
Good luck.
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