Question about Mercedes-Benz 420-Series
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Posted on Jan 02, 2017
If the check engine light is on, take the car to an autoparts store and have them scan the computer for any faulty codes that it has stored. Most parts stores will do the scan for free. It sounds like a faulty idle air control valve, but getting the codes will identify what faults the computer has noted and in what systems. Hope this helped and best wishes.
Posted on Aug 10, 2009
SOURCE: too fast idle running speed.
Typical idle for this motor is right around the amount you have described. Check to see if any check engine lights are on, or if the ABS light is on. A typical issue with this motor is the OVP relay that when not operating properly causes the engine to rev much too high (~1500-2000). Also do your revs drop significantly when you put the car into gear? If not then there really isnt an issue. When the motor is idling too high and you stick it into gear the car will typically lurch really hard.
Posted on Sep 19, 2009
SOURCE: i asked you yesterday about
There could be a vacuum leak. All vacuum hoses should be inspected and replaced as necessary. The computer does control timing but can be manually set. This could be an issue, or even someone messing with the CO adjustnment through the Mass Air Flow sensor. This is a very sensitive adjustment and should be performed by someone who knows how to do it. Another place to get a vacuum leak that is common is under the upper plenum(intake). Let me know if you find anything and if not we can go a little further into controls. You can email me at email@example.com and I should be able to find diagrams
Posted on Apr 29, 2010
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