2008 W211 E550 hard to start
Thread Starter
Junior Member
Joined: May 2020
Posts: 19
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2003 W211 E500
2008 W211 E550 hard to start
I'm having trouble starting my E550
Took it to the mechanic and they checked sparks, crank position sensor and cam position sensor etc. Only had miss fire codes. Sometimes it starts up right away, sometimes it takes many times. Heard it almost crank over but didn't start. Once running it runs fine. Any ideas?
Thank you.
Took it to the mechanic and they checked sparks, crank position sensor and cam position sensor etc. Only had miss fire codes. Sometimes it starts up right away, sometimes it takes many times. Heard it almost crank over but didn't start. Once running it runs fine. Any ideas?
Thank you.
Member
Joined: Oct 2017
Posts: 112
Likes: 19
2014 E550
how old are the spark plugs? what cylinder(s) had a misfire? have the misfire codes come back? have you checked the fuel pressure after letting the car sit overnight?
when you say he checked the sparks, did he pull each one out and inspect it, check the gaps?
when you say he checked the sparks, did he pull each one out and inspect it, check the gaps?
Thread Starter
Junior Member
Joined: May 2020
Posts: 19
Likes: 2
2003 W211 E500
Spark plugs are newish., the codes haven't come back. I haven't checked fuel pressure. The mechanic said he couldn't find Anythibg wrong. I'll check fuel pressure and clean Maf sensor. Could that help? Thanks bud
Member
Joined: Oct 2017
Posts: 112
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2014 E550
well, when exactly is it not wanting to start? after it's been sitting for a day or two?
i'd start with attaching a fuel pressure gauge to the schrader valve after the car has sat overnight, check the fuel pressure, and then try to start it and see what the fuel pressure does.
i'd start with attaching a fuel pressure gauge to the schrader valve after the car has sat overnight, check the fuel pressure, and then try to start it and see what the fuel pressure does.
Member
Joined: Oct 2017
Posts: 112
Likes: 19
2014 E550
ok. that says to me a fuel pump issue. measure your fuel pressure after it's sat for a day and see what happens
eta: quick walkthrough https://www.mercedesmedic.com/fuel-s...hooting-guide/
eta: quick walkthrough https://www.mercedesmedic.com/fuel-s...hooting-guide/
