Quote:
Originally Posted by andrewwynn
...Have you run injector cleaner? This model engine uses math to estimate the amount of gas per intake stroke. If the fuel pressure is off that's one way for the math to be wrong but when dirty the injectors will shoot less fuel thank designed so fuel trims will have to rise to compensate.
Since there's no feedback loop for How much actually comes out except O₂ sensor and the ECU assumes the injectors are perfect out blames the intake air....
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I'm wondering if my injectors are causing my lean codes/high fuel trim numbers. since I haven't yet found another cause, after two years of searching. I have no idea how old they are , what brand are they, or what condition they're in, but I've only had one or two misfires in two years, zero start or run problems, and other than high fuel trims, nothing to complain about.
Perhaps, before I do my forthcoming hands-on vacuum line examination and/or replacement, maybe I could test the injectors thru a diagnostic app, or with my Foxwell?
The injectors should be clean (and getting cleaner), because I've fed plenty of additives thru them, even though I don't drive the X5 much.
Just prior to taking the X5 for emissions/safety inspection last month (it passed!), I put in two cans of
Liqui Moly 2007 Jectron Gasoline Fuel Injection Cleaner and drove it 30 miles (probably didn't do anything that fast, but it can't hurt).
I have already been using
Lucas Oil 10576 Safeguard Ethanol Fuel Conditioner with Stabilizers every second or third fill-up, and
Lucas Oil 10013 Fuel Treatment (with injector cleaners) maybe once every year (I used it regularly on all my vehicles monthly, until I recently ran the 1-gallon jug empty).
And, I always get top-tier gas (premium) at either QuikTrip or Shell, so those brands already have some injector cleaners in their formulation.
Back to possible testing: is there a test on my Foxwell NT510 Elite, that might pinpoint injector problems? like balance, or spray pulse timing, or ?? Or, on my BimmerTool Android app, I've seen an injector test listed (on their website, it says it will
read injectors adjustments and
read actual and expected values for air mass, intake manifold pressure, fuel pressure, but I never tried it, as I was having problems getting the app to run properly with my OBD interfaces (both a bluetooth dongle, and a USB/OTG/FTDI cable, at various times, on various Android devices). That was over a year ago, so maybe I'll try again? I don't recall any injector testing ability on my other Android apps (Torque Pro or OBDLink).
Then there's my Windows 11, ARM64-based laptop, which I've seldom tried in my X. I installed INPA (and ISTA+, but it won't open, due to low memory), and OBDWiz on it; I've barely tested functionality of the INPA, and never tried the OBDWiz (basically a more detailed vesion of the Android OBDLink app, but for Windows), so I guess I'll hook-up my 10-amp charger/maintainer again (to keep from repeating the problems I had while testing just on battery power alone), and see what I can find.
Has anyone done injector diagnosis using any of the above methods?