Rough Starting

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Rough Starting

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Mercedes Forums >> Mercedes Benz Models >> Diesel Discussions >> Rough Starting

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Rough Starting - 2/1/2007 10:44:50 AM

srishell14

Posts: 9
Joined: 10/30/2006
Status: offline

Whenever starting my 300cd in the morning or after an 8 hour or so break there is 10-20 seconds of the car running very rough. I have to keep the accelerator depressed half way to keep it from stalling. Colder temperatures only make it worse. Is this average for this type of car or should something be done about it?

Post #: 1

RE: Rough Starting - 2/1/2007 7:21:18 PM

mb240D#@

Posts: 2
Joined: 1/23/2007
Status: offline

My 240D used to run rough in the cooler and cold temps until I did a diesel purge and replaced the 2 filters and finally the glow plugs. Now it idles much nicer when first starts up and I don't have to turn up the idle.
Hope this helps
Bob and his 1980 240D

(in reply to srishell14)

Post #: 2

RE: Rough Starting - 2/1/2007 7:23:50 PM

mb240D#@

Posts: 2
Joined: 1/23/2007
Status: offline

One more thing I did was add a lower radiator hose heater to help with the cold temps here in Maine. My 240D starts at -6 and runs nice.
Bob and his 240D

(in reply to mb240D#@)

Post #: 3

RE: Rough Starting - 2/2/2007 6:19:25 PM

srishell14

Posts: 9
Joined: 10/30/2006
Status: offline

Can you explain to me what a diesel purge is? Previously, I have only associated that with svo conversions. Thanks a lot for the help.

(in reply to mb240D#@)

Post #: 4

RE: Rough Starting - 2/2/2007 6:42:57 PM

jlguler

Posts: 31
Joined: 11/21/2006
Status: offline

Hello, Here is a link with step by step instructions for a diesel purge. Basically, diesel purge is a mild solvent that cleans out your fuel system. It really works....

http://dieselgiant.com/injectorcleaning.htm

Regards,
John

(in reply to srishell14)

Post #: 5

RE: Rough Starting - 2/3/2007 10:32:42 AM

AMGMercedes

Posts: 1550
Joined: 1/31/2006
From: Maryland
Status: offline

quote:

run rough in the cooler and cold temps until I did a diesel purge

Mine does the same and wouldn't start today for work

Will be doing this in a few days....

_____________________________

1984 Mercedes 190D-SOLD!
1999 Honda Civic DX- Current DD
1986 Mercedes 190E-16v-On the way

(in reply to jlguler)

Post #: 6

RE: Rough Starting - 2/3/2007 9:44:17 PM

ForcedInduction

Posts: 864
Joined: 5/20/2006
From: Federal Heights, Colorado
Status: offline

You have 1 or more bad glowplugs.

(in reply to AMGMercedes)

Post #: 7

RE: Rough Starting - 2/4/2007 12:14:38 AM

AMGMercedes

Posts: 1550
Joined: 1/31/2006
From: Maryland
Status: offline

And $51.80 later. Not bad for two years I suppose?

_____________________________

1984 Mercedes 190D-SOLD!
1999 Honda Civic DX- Current DD
1986 Mercedes 190E-16v-On the way

(in reply to srishell14)

Post #: 8

RE: Rough Starting - 3/6/2007 11:37:52 PM

kurt08

Posts: 84
Joined: 10/5/2005
Status: offline

quote:

ORIGINAL: srishell14

Whenever starting my 300cd in the morning or after an 8 hour or so break there is 10-20 seconds of the car running very rough. I have to keep the accelerator depressed half way to keep it from stalling. Colder temperatures only make it worse. Is this average for this type of car or should something be done about it?

When I changed some of my Mercedes 240d parts on my car's fuel system and made a diesel purge, it made my ride smoother...

(in reply to srishell14)

Post #: 9

RE: Rough Starting - 3/19/2007 9:04:46 PM

gianigreco

Posts: 37
Joined: 10/14/2004
Status: offline

One more thing to consider about the rough starts. I just went through this with my 1998 E300TD. I was getting air in the fuel lines which was due to old rubber and the advent of the low sulfer fuels. There were no obvious leaks but it was easy to see the air in the fuel lines. Good luck.

(in reply to kurt08)

Post #: 10