[Koolsilver]

I am pretty sure some of my injectors may be bad because of the symptoms my car is having but I want to be certain before I go and spend $1k on new injectors. I already tried the test to pull out injectors and crank the engine and see if any them spray and none of them sprayed which led me to believe that they are ok. However, many of my cars symptoms seem to be pointing to bad injectors. So is it perhaps this test is not 100% accurate all the time, or maybe I didn't crank the car enough to see if they would eventually start spraying? Is there another test I could do to experiment with this?

My injectors are original in my 2009 and they are index 5. My car has a rough idle when first started that sounds like a slight misfire but no misfire codes and the idle will hunt a little bit on startup. Also during deceleration my AFR will not stay constant at 234 it will sometimes get there and then fluctuate or sometimes not get to 234 at all and maybe hover a bit below 234.

[mweisdorfer]

Originally Posted by Koolsilver

I am pretty sure some of my injectors may be bad because of the symptoms my car is having but I want to be certain before I go and spend $1k on new injectors. I already tried the test to pull out injectors and crank the engine and see if any them spray and none of them sprayed which led me to believe that they are ok. However, many of my cars symptoms seem to be pointing to bad injectors. So is it perhaps this test is not 100% accurate all the time, or maybe I didn't crank the car enough to see if they would eventually start spraying? Is there another test I could do to experiment with this?

My injectors are original in my 2009 and they are index 5. My car has a rough idle when first started that sounds like a slight misfire but no misfire codes and the idle will hunt a little bit on startup. Also during deceleration my AFR will not stay constant at 234 it will sometimes get there and then fluctuate or sometimes not get to 234 at all and maybe hover a bit below 234.

If you have a bad injector, you will get a code.

[JM98]

Originally Posted by Koolsilver

I am pretty sure some of my injectors may be bad because of the symptoms my car is having but I want to be certain before I go and spend $1k on new injectors. I already tried the test to pull out injectors and crank the engine and see if any them spray and none of them sprayed which led me to believe that they are ok. However, many of my cars symptoms seem to be pointing to bad injectors. So is it perhaps this test is not 100% accurate all the time, or maybe I didn't crank the car enough to see if they would eventually start spraying? Is there another test I could do to experiment with this?

My injectors are original in my 2009 and they are index 5. My car has a rough idle when first started that sounds like a slight misfire but no misfire codes and the idle will hunt a little bit on startup. Also during deceleration my AFR will not stay constant at 234 it will sometimes get there and then fluctuate or sometimes not get to 234 at all and maybe hover a bit below 234.

Which bank fluctuates? That will typically be the one with the bad injector.

[Koolsilver]

Bank 2 is the one that fluctuates but doing the test I talked about above showed no leaking/spraying. Paying extra attention today I noticed every time I started my car it idled rough for about 30sec-1min and that was after my car was parked for about 4 hours each time.

[RocketSurgeon]

Injectors can absolutely leak and act up without throwing any codes. They only throw codes if they die completely.
I had an index 5 and index 9 leaking when I pressurized the rail with the injectors outside the engine.
I would want to look at the smooth running values and injector values in INPA

[White330]

Originally Posted by Koolsilver

Bank 2 is the one that fluctuates but doing the test I talked about above showed no leaking/spraying. Paying extra attention today I noticed every time I started my car it idled rough for about 30sec-1min and that was after my car was parked for about 4 hours each time.

Rough idle after sitting like that were my symptoms for leaking injectors and I never threw any codes. You can also let the car sit over night and than pull your plugs and check for gas on them(which is why it could be running a bit rough after sitting). I definitely recommend replacing them also for the fact you are running index 5.

[Koolsilver]

Originally Posted by White330

Rough idle after sitting like that were my symptoms for leaking injectors and I never threw any codes. You can also let the car sit over night and than pull your plugs and check for gas on them(which is why it could be running a bit rough after sitting). I definitely recommend replacing them also for the fact you are running index 5.

I actually did that today. This morning after letting the car sit overnight I pulled all my plugs they all looked ok except cylinder 4 smelled pretty strong like gas but had no visible wetness on it. I then put them all back in and disconnected all electrical from the injectors and coil packs and cranked the car several times to pressurize the fuel more. I then took cylinder 4 out again and again didn't see any visible wetness but it did have a strong fuel smell.

At this point seeing the AFR fluctuate in bank 2 and finding cylinder 4 with the smell is almost conclusive but it bugs me that I can't actually see any fuel on the plug and doing the test when pulling out the injectors showed no fuel. I agree replacing injectors would probably be good considering they are index 5 anyways but money is tight right now so $1k is hard to swallow if not necessary.

[White330]

Originally Posted by Koolsilver

I actually did that today. This morning after letting the car sit overnight I pulled all my plugs they all looked ok except cylinder 4 smelled pretty strong like gas but had no visible wetness on it. I then put them all back in and disconnected all electrical from the injectors and coil packs and cranked the car several times to pressurize the fuel more. I then took cylinder 4 out again and again didn't see any visible wetness but it did have a strong fuel smell.

At this point seeing the AFR fluctuate in bank 2 and finding cylinder 4 with the smell is almost conclusive but it bugs me that I can't actually see any fuel on the plug and doing the test when pulling out the injectors showed no fuel. I agree replacing injectors would probably be good considering they are index 5 anyways but money is tight right now so $1k is hard to swallow if not necessary.

Yeah I agree. I only like to replace more expensive things when necessary. I like in the Sacramento area and i've recently replaced my injectors. Ill see if I have any that are close to index 5 and you can have them if you'd like. I had 1 leaking but just ended up replacing them all because of all the horror stories i've heard about them leaking.

[Koolsilver]

Originally Posted by White330

Yeah I agree. I only like to replace more expensive things when necessary. I like in the Sacramento area and i've recently replaced my injectors. Ill see if I have any that are close to index 5 and you can have them if you'd like. I had 1 leaking but just ended up replacing them all because of all the horror stories i've heard about them leaking.

That would be great! I could use one to verify if it is in fact leaking. I think if I could just prove to myself that one was definitely leaking I would do the same and replace them all to be safe

[White330]

Originally Posted by Koolsilver

That would be great! I could use one to verify if it is in fact leaking. I think if I could just prove to myself that one was definitely leaking I would do the same and replace them all to be safe

I’ll check them today after work and I’ll let you know! Also do you have a way to code them? If not I’ve got a schwaben tool lying around here somewhere.

Originally Posted by mweisdorfer

If you have a bad injector, you will get a code.

Couldn't be farther from the truth.

[Koolsilver]

Originally Posted by White330

I’ll check them today after work and I’ll let you know! Also do you have a way to code them? If not I’ve got a schwaben tool lying around here somewhere.

Thank you so much for your help I really appreciate it! I do have INPA on my computer which I believe works for coding the injectors.

[White330]

No problem! So I checked mine and sadly mine are all index 8 and 9. But my buddy swapped his out as well and said he will check to see if he's got anything.

[Koolsilver]

Originally Posted by White330

No problem! So I checked mine and sadly mine are all index 8 and 9. But my buddy swapped his out as well and said he will check to see if he's got anything.

I really appreciate you checking for me, hopefully the one your buddy has will work.

[White330]

Originally Posted by Koolsilver

I really appreciate you checking for me, hopefully the one your buddy has will work.

So I Just checked his, and they are all Index 8 except for one which is Index 4.

[Koolsilver]

Originally Posted by White330

So I Just checked his, and they are all Index 8 except for one which is Index 4.

If it wouldn't be too much trouble it would be great if I could get the index 4, that way I could swap it in and hopefully that will tell me for sure if mine is bad or not.

[White330]

I’d be more than happy to give you the injector. If you like you can take one of the index 8 just in case. Message me when you would like to meet up

[Bimmer_Engineer]

Originally Posted by FCobra94

Couldn't be farther from the truth.

Is there any further insight on how to test the injectors? My car has a stumbling idle on cold starts (6+ hours) that goes away after 5-10 seconds. I have index 1 so i'm feeling it might be the injectors but I don't want to spend $1200 on injectors if that's not the issue. I let the car sit for 2 days and then pulled the plugs and they were all dry, didn't look fouled, and none smelled like gas.

The stumbling seems to be getting progressively worse in the rpm variation, but seems to clear up in 5-10 seconds no matter what. I'm not getting any codes related to injectors...but I did get a 2A17: DMTL System Fault...

[NoQuarter]

Originally Posted by Bimmer_Engineer

Is there any further insight on how to test the injectors? My car has a stumbling idle on cold starts (6+ hours) that goes away after 5-10 seconds. I have index 1 so i'm feeling it might be the injectors but I don't want to spend $1200 on injectors if that's not the issue. I let the car sit for 2 days and then pulled the plugs and they were all dry, didn't look fouled, and none smelled like gas.

The stumbling seems to be getting progressively worse in the rpm variation, but seems to clear up in 5-10 seconds no matter what. I'm not getting any codes related to injectors...but I did get a 2A17: DMTL System Fault...

Well... it's not like the dripping injector is dropping right onto the plug. It would be down on the cylinder head, leaking past the rings, etc.

[feuer]

Originally Posted by Bimmer_Engineer

Is there any further insight on how to test the injectors? My car has a stumbling idle on cold starts (6+ hours) that goes away after 5-10 seconds. I have index 1 so i'm feeling it might be the injectors but I don't want to spend $1200 on injectors if that's not the issue. I let the car sit for 2 days and then pulled the plugs and they were all dry, didn't look fouled, and none smelled like gas.

The stumbling seems to be getting progressively worse in the rpm variation, but seems to clear up in 5-10 seconds no matter what. I'm not getting any codes related to injectors...but I did get a 2A17: DMTL System Fault...

Could be your spark plugs as well. I have two index #1 in perfectly good order with new Teflon seals if you need replacement. But look unto the spark plugs first.

[arhoads335i]

To tell if you have a leaking injector at your oil change get it sent out to black stone. It should show up. Wont narrow it down but will prepare you. I have all index 1 injectors so ow well. Maybe buy some fuel injector cleaner .

[Bimmer_Engineer]

This will show if there’s gasoline in the oil?

Also...to couch this a different way...what else might the be? I have 90k miles...new plugs and coils...new pcv...not throwing any codes...the fuel pumps are original but they looked okay last time I logged and the WOT pulls felt strong before the boost leak i’m also trouble shooting showed up...