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#1
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2000 ML320 hard start
i have a 2000 ML320, 140,000 miles. after it sits for a while it cranks over a long time before it starts. if i shut it off and start it right away it starts normally. i have scanned it but no codes were found. i have replaced the fuel pump and filter but it hasn't helped. i pulled the injecotrs out to see if any were bleeding off any pressure after shutoff but couldn't see any signs of a leak anywhere. i believe there is supposed to be residual pressure in the fuel system after it's turned off so it will start right up but i'm not sure. after it sits for a while i open the schrader valve on the fuel rail but there is no pressure (there is right after shutoff though). is there a check valve in the fuel line i've overlooked? about a week ago the check engine light came on and it ran rough. i turned it off and restarted and it ran fine but the engine light remained on. when i got home i did a scan and misfire on #4 came up. i reset it and since then it runs well and hasn't had any trouble except for the hard start. someone told me it could be the crank position sensor? i can't keep throwing money at this car. i really don't like it but my wife does, and for now i'm stuck with it. my car is an '86 300SDL with 300,000 miles and is a much better car quality wise.
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#2
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Sounds like a fuel bleed-off issue.
Either the replacement pump OR filter is to blame!
__________________
MERCEDES Benz Master Guild Technician (6 TIMES) ASE Master Technician Mercedes Benz Star Technician (2 times) 44 years foreign automotive repair 27 Years M.B. Shop foreman (dealer) MB technical information Specialist (15 years) 190E 2.3 16V ITS SCCA race car (sold) 1986 190E 2.3 16V 2.5 (sold) Retired Moderator |
#3
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thanks for the reply. i guess i'll try the filter first since that's the cheapest. i understand there's a check valve in the filter but i'm not sure about the pump. this problem happened suddenly when she stopped for gas one day. the pump that we took out was a replacement, only about 6 months old. not noisy and car ran fine and still does after startup. i was able to warranty it but with the new pump and filter there's no difference.
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#4
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thanks M.B. DOC. i changed the filter (no easy task) and that solved the problem. it starts right up now.
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