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My w164 ML63 has been idling a bit rough, especially when warm.
Checked all hoses and thought I had it when I found a small vacuum hose at the back end of the motor loose. 1 hr later when it was warm it was still doing it.
Had a look on here for common issues and I ended up running the car with the Purge Valve harness disconnected. Wow what a difference. Idle is smooth as.
I toured around for about 30 mins, pulling over to connect and disconnect it.
It definetly has to be the culprit.
Has anyone else changed out one of these?
Does seem strange that the car works great with it disconnected!
No engine lights at all either, connected or disconnected.
Last edited by schmick325; May 4, 2013 at 01:08 AM.
Hi, can you update us on what caused the issue?
Thanks.
There is an adjustable 'runner' in the intake that adjusts depending on load and revs and this was gummed up and jammed, not allowing smooth operation and the required amount of air going into the cylinders.
Thanks and appreciate the quick reply. So you had to have the intake manifold taken off (the middle silver piece in the pic) and cleaned or did the runner part have to be replaced? How much approx. was the repair?
Thanks again.
Originally Posted by schmick325
There is an adjustable 'runner' in the intake that adjusts depending on load and revs and this was gummed up and jammed, not allowing smooth operation and the required amount of air going into the cylinders.
Hi I have a 2009 ml320 and trying to locat the purge valve. Is any one familiar with the location of that valve, can I access from the top in the engine compartment or need to go from bottom of the car? If there is a picture that will really help a lot. Thanks!!
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