Have Mercedes Questions? Ask a Mechanic for Answers ASAP
Hi, welcome to Just Answer. I’m Ron and I’ll be helping youtoday.Before we get started though, Please understand that I don't knowyour skill level or tools you have to assist us. Also understand thatI can't see, smell, hear, or touch the vehicle either, so patience isappreciated. JA is a great Q/A site, but it does NOT replace arepair shop.My goal is to make you happy and get a great rating in return formy time. Sometimes I have to give you bad news that I know youdidn’t want to hear, so please don’t shoot the messenger.
I would be running some different tests on your system, such as fuel pressure hot and cold engine, spark at the plugs hot and cold engine. attach a scan tool and look at data such as fuel trims hot and cold engine and EVAP controls of the purge solenoid especially. I need to know if you have a check engine light on too.
Great, then this leaves us with the additional testing to get to our final results. I would also want to see MODE 6 data via the scan tool because of the recorded data it provides. I also would like to check the security system for proper operation including keys and key reader. Another smart thing your tech can do is attach a flight recorder to your DLC connector and read the data it recorded in the past 24 hours of driving which includes each drive cycle. VERY important testing for problems like your.
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Okay, and YES, he has the right equipment to approach these tests. Flight recorders are NOT expensive, about $50.00 on Amazon for an OTC 3005 infologger. Most shops have 3 or 4 of these tools or alike.