Hi all - new account/first post - been lurking on this forum for a few years and it's always helped me out.
I've recently inherited the family 2003 WG with 120k on the clock. Drove it across the Nullarbor from Perth to Melbourne and it did well. The Jeep idles rough (rpm needle shaking around), and I was hoping that the long road trip might iron out some of the kinks - as you can tell my family didn't drive it much - only short trips around the city. Previous mechanic told he that he suspected an injector was on the way out. I believe the injectors are all original, and I don't see any black death.
Unfortunately, the road trip didn't iron out the rough idle ultimately, but I did notice that at the end of each 8hr driving day it seemed to idle smooth and like a dream. Hasn't been a major problem until recently when the WG seemed to be idling particularly rough at the lights and then stalled whilst waiting at the lights and MIL came on with P0190. Started right away afterwards. Since then I've had P0190 twice more whilst driving - once on the highway (didn't notice anything, kept on driving fine), and another time at 50kph when the engine seemed to shudder and jolt but then continue unabated.
I've read that P0190 "Fuel Rail Pressure Sensor Circuit Malfunction" can be related to bad injector(s), so I bought WJDiag Pro and did a few fuel correction tests. I did a bunch whilst idling and driving in different conditions, screenshotted each result then put them into Excel. Here are the results:
The colour-coding doesn't mean anything except lowest (red) to highest (green), just to help visualise. Since WJDiag gave me Cylinder RPM I decided to calculate the % difference of each from average to see if anything came up (right columns).
I'm not too sure what to make of these results - seems like Injector No. 3 is on the way out, but I'm not sure about the others. Should I order a new injector and swap this one out and see what happens? Am I on the right track with the P0190/stalls? There's another thread on here with similar symptoms but there's no conclusion:
https://www.ausjeepoffroad.com/forum...d.php?t=153447
Thanks all.