BenzWorld Junior Member
Date registered: Jun 2017
Vehicle: 2000 ML430
Mentioned: 0 Post(s)
Quoted: 4 Post(s)
Hey everyone thanks for your input.
I just finished reassembling everything. I replaced two injector seats, as they were cracking. I also replaced all the injector seals and that air supply hose on the right side.
The injector cleaning seemed to go well, after dozens of treatment with the ultrasonic cleaner and a week soaking in carb cleaner they went from a rust-tinged and oil-stained brown to shiny metallic grey (see pics before and after)
Re-installation went as smoothly as I could have hoped, but it's very tough working around the injectors and in those tiny spaces.
Anyway, with the cleaned injectors installed, the car fired right up! It seems to be running MUCH MUCH better, however, it still stumbles and stalls occasionally, though much less than before, when it would barely idle for 5 minutes, and erratically. Now it idles smoothly and sounds much better when it revs up, with only an occasional hesitation. It does occasionally stall, though, which is very disappointing.
Could I have misdiagnosed the main issue?
Or is the car just working through the mix of whatever was left in the tank when I picked the car up (the previous owner claimed to have put fresh gas in it), the new gas I put in it, and the seafoam? Maybe as the seafoam works through it will improve, and once I put a fresh tank in it will be fine?
Or am I just deluding myself and the occasional stalling is being caused by something other than the injector problem?
It seems that the injectors did need a good cleaning no matter what, but what should I do next to diagnose the occasional stalling? Should I just gamble and replace the distributor cap rotor and the coil as tusabes recommends?