Injector Values

[AdamE53]

Had an issue with a no-start this morning that I eventually got running.
2003 x5 3.0l, went to start this morning, just turned over and randomly sputtered (sounded like no/little fuel).
Finally got it running and seemed normal.
Hooked up bimmer tools through my phone and scanned, no codes relevant.
Checked the injector section and found these values:

2024-12-16 10:10:52
X5/E53/2002/M54 / MS430DS0
------------------------------------------------------------
Coolant temp. 160.25 °F
Lambda integrator group 1 -4.46 %
Lambda integrator group 2 -5.17 %
Mixture additive adaptation (bank 1) 0.06 ms
Mixture additive adaptation (bank 2) 0.03 ms
Mixture multiplicative adaptation (bank 1) 4.53 %
Mixture multiplicative adaptation (bank 2) 3.96 %
Lambda (1) voltage 634.78 mV
Lambda (2) voltage 122.07 mV
Lambda (1) voltage (behind cat.) 180.67 mV
Lambda (2) voltage (behind cat.) 83.01 mV
Cylinder 1 adjustment 0.02 -
Cylinder 2 adjustment 0.18 -
Cylinder 3 adjustment 0.65 -
Cylinder 4 adjustment 79.87 -
Cylinder 5 adjustment 78.83 -
Cylinder 6 adjustment 0.39 -
----- bimmer-tool 3.7.6-L -----

2024-12-16 10:13:56
X5/E53/2002/M54 / MS430DS0
------------------------------------------------------------
Coolant temp. 167.0 °F
Lambda integrator group 1 -3.12 %
Lambda integrator group 2 -2.12 %
Mixture additive adaptation (bank 1) 0.06 ms
Mixture additive adaptation (bank 2) -0.01 ms
Mixture multiplicative adaptation (bank 1) 4.53 %
Mixture multiplicative adaptation (bank 2) 3.96 %
Lambda (1) voltage 805.68 mV
Lambda (2) voltage 810.56 mV
Lambda (1) voltage (behind cat.) 825.21 mV
Lambda (2) voltage (behind cat.) 825.21 mV
Cylinder 1 adjustment 0.78 -
Cylinder 2 adjustment 79.8 -
Cylinder 3 adjustment 79.04 -
Cylinder 4 adjustment 79.55 -
Cylinder 5 adjustment 77.27 -
Cylinder 6 adjustment 79.26 -
----- bimmer-tool 3.7.6-L -----

First set of numbers is at idle (warm) and second set is after bringing it up to 2000rpm and those numbers reflect while its returning to idle.

So, i'm not very familiar with injector values but to my knowledge this means that injectors 4 and 5 are bad: either clogged or faulty?
Any input on this would be greatly appreciated!

Edit: just noticed that it may not be clear but all the injector values are in fact "+" not "-". The app shows all the numbers as positive values but what I copied and pasted it seems it would show as minus.
To my understanding, positive value adjustments mean less fuel and more air?

[80stech]

Start with checking the fuel pressure first.

[AdamE53]

I'm currently sourcing one out to check this. In the meantime, would the pressure be an issue if it eventually started to run normally? Would low fuel pressure affect only two cylinders/injectors? Can fuel pressure rise and fall while the car is starting/running?

[80stech]

Yes, on all of that. If the pressure drops off too much the system looses prime and that doesn't always recover quick enough when the fuel pump primes when the key is first turned, especially with a system like E53 where the regulator is in the fuel filter. You really shouldn't be looking at injector values at all at this point.

Maybe check the spark plugs while you are waiting for the fuel gauge.
This thread should really be called "hard starting cold" you could probably have a look at some of those type of threads as well.

[AdamE53]

Totally understandable. I started with the injector values because it was an anomaly that I found involving fuel.

[80stech]

As you are pulling the coils give the end of the boots a squeeze to see if there are cracks.

[AdamE53]

Originally Posted by 80stech

As you are pulling the coils give the end of the boots a squeeze to see if there are cracks.

Will do

[AdamE53]

So, since this happened yesterday, it has been functioning as normal. No issues starting whatsoever anymore. I believe there may have been an issue with it sitting for a few days and losing prime in the fuel system. Even now, 7:45am cold start with no problem whatsoever. But I still believe there is an issue with the fuel system which I can now investigate at my leisure instead of in a panic!

[80stech]

It would probably be a good idea to have a look at the plugs and coils if that hasn't been done in a while. Good to do the fuel pressure test too even if that's not a problem so that you get familiar with how that works. I have a had a similar issue with mine when after sitting for about three days but then it acts like it's flooded. I suspected the injectors leaking but when I pulled the rail nothing was obvious so I sent them out for cleaning and testing but they could only just clean up the ends a bit because they said I have the Siemens injectors which have ceramic seats and will be ruined with ultrasonic cleaning. They flow tested and all was good but they did say all the injectors leaked just a tiny bit. I suspect that 2 or three days was just the right amount to vapour flood the engine anything less was not enough and longer would have given the vapour time to dissipate. Anyway it's very rare that I let the vehicle sit for 2 or 3 days anyway and knowing what the problem is makes it not worth replacing the injectors for.
Whatever the issue though it's always good to have the plugs and coils in good shape.

[AdamE53]

Originally Posted by 80stech

It would probably be a good idea to have a look at the plugs and coils if that hasn't been done in a while. Good to do the fuel pressure test too even if that's not a problem so that you get familiar with how that works. I have a had a similar issue with mine when after sitting for about three days but then it acts like it's flooded. I suspected the injectors leaking but when I pulled the rail nothing was obvious so I sent them out for cleaning and testing but they could only just clean up the ends a bit because they said I have the Siemens injectors which have ceramic seats and will be ruined with ultrasonic cleaning. They flow tested and all was good but they did say all the injectors leaked just a tiny bit. I suspect that 2 or three days was just the right amount to vapour flood the engine anything less was not enough and longer would have given the vapour time to dissipate. Anyway it's very rare that I let the vehicle sit for 2 or 3 days anyway and knowing what the problem is makes it not worth replacing the injectors for.
Whatever the issue though it's always good to have the plugs and coils in good shape.

Thanks for the advice. When i get a chance, i'm going to take a look at all of this. Since this incident, the vehicle has been behaving very well. Other than cold weather affecting the door handles for some reason (had two carriers break and had to source them at a wrecker and change them in the freeing cold).