[OmahaDZL]

While my car is in pieces...I figured Id get my injectors tested. Took them to a local diesel specialty shop that a diesel mechanic referred me to.

He said all 6 tested perfectly on flow, but 2 of them failed the Ohms test. (guess I should say resistance test)

Does this makes sense to anyone? To my knowledge, I was not getting any codes on injector issues prior to this. I was doing this out of an abundance of caution.

Any thoughts would be appreciated....

Im half tempted to order 2 from ebay and call it good, but thats still 700 bucks...for parts that I dont know have anything wrong...

[CO335D]

Originally Posted by OmahaDZL

While my car is in pieces...I figured Id get my injectors tested. Took them to a local diesel specialty shop that a diesel mechanic referred me to.

He said all 6 tested perfectly on flow, but 2 of them failed the Ohms test.

Does this makes sense to anyone? To my knowledge, I was not getting any codes on injector issues prior to this. I was doing this out of an abundance of caution.

Jess says either he screwed up the test or the guy broke the injectors.

Any thoughts would be appreciated....

Im half tempted to order 2 from ebay and call it good, but thats still 700 bucks...for parts that I dont know have anything wrong...

Ohm testing is pretty easy. I'd be impressed if the guy messed up the test. It's possible he messed up your injectors flow testing them.

If you have an Ohmmeter you can check the resistance of your injectors yourself. You will know which two he is saying are bad, as they will read way off the other 4.

The only person I'd trust with a Bosch injector is Lenny Reed at Dynomite Diesel. He was my go to when I was in the high horsepower Cummins game. I'd trust him testing and inspecting these injectors as well.

[glitdi]

What does he mean they failed the ohm test...
What resistances did he get?
Did he mark which hole they came from? they need to be programmed to the dde.
This guy sounds like a hack...

[OmahaDZL]

1. Guy who tested them did NOT remove them from the car. Tester is a diesel specialty shop. I delivered the injectors to him.
2. Guy who removed them DID mark which one came from which cylinder and DOES know that they are coded into the DDE.
3. The test was not some hacky crap that you guys are thinking. Shop is a certified Bosch common rail injector tester.
4. They hook the injector up to this:

The Bosch EPS 200
5. The actuator should have between 175 and 200 kOhms, 2 of my injectors tested at 131.4 and 142.9. Which happen to be from cylinders 5 and 6

Testing shop called Bosch to find out if they should be replaced because flow rate was still correct. Bosch tech service said that the device they were using to test was the same they used at the factory. If it fails any test, they need replaced. The guy at Bosch that knew the most about this was not in the office at the time of the phone call, but it was theorized that the injector may be slightly slow at opening and closing the valves if their resistance was low.

This leads me to believe that they could be the cause of a rough idle, but still not have any issues with fueling per se. As for the fact that both come from cyls 5 and 6...it COULD be random...or it could be heat related. Anyone have any input on which cylinder injectors had issues for you?

OH btw...I think Id trust anyone who has one of these testing devices...but wouldnt trust anyone that doesnt....

Thanks

[glitdi]

Originally Posted by OmahaDZL

1. Guy who tested them did NOT remove them from the car. Tester is a diesel specialty shop. I delivered the injectors to him.
2. Guy who removed them DID mark which one came from which cylinder and DOES know that they are coded into the DDE.
3. The test was not some hacky crap that you guys are thinking. Shop is a certified Bosch common rail injector tester.
4. They hook the injector up to this: The Bosch EPS 200
5. The actuator should have between 175 and 200 kOhms, 2 of my injectors tested at 131.4 and 142.9. Which happen to be from cylinders 5 and 6

Testing shop called Bosch to find out if they should be replaced because flow rate was still correct. Bosch tech service said that the device they were using to test was the same they used at the factory. If it fails any test, they need replaced. The guy at Bosch that knew the most about this was not in the office at the time of the phone call, but it was theorized that the injector may be slightly slow at opening and closing the valves if their resistance was low.

This leads me to believe that they could be the cause of a rough idle, but still not have any issues with fueling per se. As for the fact that both come from cyls 5 and 6...it COULD be random...or it could be heat related. Anyone have any input on which cylinder injectors had issues for you?

OH btw...I think Id trust anyone who has one of these testing devices...but wouldnt trust anyone that doesnt....

Thanks

K thats more like it..
Yes throw some injectors at it...
185 k ohm is spec if I remember right + or - 10% or it might be 175k ohm I would have to go look back at my notes at either value they are failing.

Typically heat will increase resistance, not reduce resistance... that being said its not a stead fast rule more of a guideline.

I know that these injectors are prone to failure, its a bit of a debate if the injector failure could be caused by carbon intake build up.. The dealerships throw parts at this thing like there is no tomorrow so its difficult to determine if injector failure is due to potential heat from a carbon buildup issue...
they have a misfire, throw injectors at it, limp mode throw injectors, alignment issue throw injectors at it... I shutter to think how many perfectly good injectors got replaced on these cars due to no one taking the time to do a proper diagnosis...

I had a #6 injector fail.. was it cbu related? Don't know for sure.. either way a common rail bosch injector should last the lifetime of the engine... Don't know what bosch sold bmw but It must have needed more testing before they threw it in their engines.. The dealership said its a common issue...Still going to take that advise with a grain of salt..

If its running rough look at carbon build up, swirl flaps etc... but you probably already know that...

[OmahaDZL]

Originally Posted by glitdi

K thats more like it..
Yes throw some injectors at it...
185 k ohm is spec if I remember right + or - 10% or it might be 175k ohm I would have to go look back at my notes at either value they are failing.

Typically heat will increase resistance, not reduce resistance... that being said its not a stead fast rule more of a guideline.

I know that these injectors are prone to failure, its a bit of a debate if the injector failure could be caused by carbon intake build up.. The dealerships throw parts at this thing like there is no tomorrow so its difficult to determine if injector failure is due to potential heat from a carbon buildup issue...
they have a misfire, throw injectors at it, limp mode throw injectors, alignment issue throw injectors at it... I shutter to think how many perfectly good injectors got replaced on these cars due to no one taking the time to do a proper diagnosis...

I had a #6 injector fail.. was it cbu related? Don't know for sure.. either way a common rail bosch injector should last the lifetime of the engine... Don't know what bosch sold bmw but It must have needed more testing before they threw it in their engines.. The dealership said its a common issue...Still going to take that advise with a grain of salt..

If its running rough look at carbon build up, swirl flaps etc... but you probably already know that...

Yeah, I bought 2 injectors off ebay for pretty cheap, supposed to be new bosch with warranty. Ill have them tested just in case Im looking at the spec sheet now from the machine..definitively it is 170-200 kOhms...so you are right there in the area.

As for BMW throwing parts at it...thats what troubles me the most. If BMW doesnt have a tester, they should...but lets just say they dont: This is 10 dollars per injector. I cant think of ANY situation where I would want them to throw 3 grand at my car before 60 dollars worth of testing by a certified tester. I dont care if its just out of precaution...60 dollars is nothing in the grand scheme.

Intake is off, already been cleaned...head is up next... This should have it running like a champ.

[glitdi]

May have to update the software at the dealership depending on how the car behaves after she is back together. I had performed the cbu cleaning and my car would still go into limp mode.
The only time its been to the dealership under my ownership was to perform an irap session and to update the dde software, the performed a mass quantity adaptation and voila! no more limp mode.
Long story short once its back together if it still runs like crap try software update to most current software. If you need help programing the injectors let me know.

On the note of throwing parts at the thing, bmw gives the tech a just barely enough time to diagnose and replace the component.Some times you make time some time you lose time, when you loose time you have a small army of tech's, service writers, managers etc breathing down their back..."are you done yet? "
The sad state of affairs is now you plug the scan tool in and throw parts at it in that environment... lame... Feel bad for those guys.. This is why independent mechanics can be better in a lot of ways. they may not have the factory training but some times thats a good thing!

[OmahaDZL]

Originally Posted by glitdi

May have to update the software at the dealership depending on how the car behaves after she is back together. I had performed the cbu cleaning and my car would still go into limp mode.
The only time its been to the dealership under my ownership was to perform an irap session and to update the dde software, the performed a mass quantity adaptation and voila! no more limp mode.
Long story short once its back together if it still runs like crap try software update to most current software. If you need help programing the injectors let me know.

Well, I am in the process of going stage 3 right now, my DDE is in FedEx on its way to Andrew/Jarek....so I sure hope that things dont get out of whack. The car is actually at a euro mechanic shop right now so I would hope that they know what they are doing with the new injectors.

But I definitely appreciate the advice and the offer to help. Never know, I may need it soon!