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Old 05-22-2002, 04:31 PM
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rough starting 300CE

I have a '91 300CE. In the mornings or when cold, it starts right up. When I'm driving around and shut it down for less than 5 minutes, it starts right up as well. Anything more than that and it stalls on the first crank. The RPM's surge as if though it is going to start fine but then it sputters. On the second crank it usually starts up fine.

I'm guessing it is some sort of fuel system problem. I have not had the car that long. I just replaced the air filter. I was gonna do the plugs but, it seems there is some sort of tool required to remove the wire boot off the plug. Is this correct? I do not want to pull them and end up ruining them.

Any advice is greatly appreciated. Thanks in advance.
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Old 05-22-2002, 04:42 PM
Ashman's Avatar
Service Advisor
Join Date: Sep 2000
Location: Sherman Oaks, CA
Posts: 4,748
My car has the same problem, and I justlive with it. I'm not about to throw good money on replacing parts in the fuel and ignition systems.

I have been told that most M104 engine cars if not all of them do it. To me I'd fix it if I knew exactly, but it could be anything form vapor lock, to low fuel pressure, to faulty ignition components and all. If you figure it out, I'd like to know myself. Otherwise its no big deal to me as long as it still starts on the second try.

Good Luck,

'92 300CE - Sold
2004 C240 - C7 Wheels
2015 ML350 - P1, Pano, Ash poplar wood, Sport Dinamica interior, Running Boards Keyless go.
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Old 05-23-2002, 01:00 AM
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Had the same problem with my 91/300E, recently replaced the fuel injectors, fixed my warm
start problem, car has never ran better.
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Old 05-23-2002, 10:50 AM
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Thanks, guys. I did the plugs. The problem is still there but, it is not rough when it putters out.
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Old 05-23-2002, 02:09 PM
Registered User
Join Date: Nov 2000
Location: Manchester, United Kingdom
Posts: 42
Try to check the throttle setting, the throttle should be totally close, when idelling. there are tro micro switch, one of them for the KE computer, and one of them is for the ignition computer, in idelling position, when the throttle has closed, both of the switich should be 'close' as well.

I fould problem with mind in starting ( mind is a 300E, and after pin point the problem and replace some parts from in the injection system, finally I fould that, is just the throttle setting playing with me!
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Old 05-23-2002, 02:36 PM
Dan Dan is offline
Registered User
Join Date: Jun 2001
Posts: 29
I have an 89 300CE (luckily, only 80K) with the 103 engine and experienced hot start problems as well. similar to your Redlava. After researching posts here, I attempted to solve it myself through the 'parts replacement process' to no avail: OVP, fuel system check valves, fuel pump relay. It appeared to be fuel pressure leakdown but the MB dealer measured it and it was stable. Still, the dealer could not diagnosis the problem.

I ended up taking it to an independant shop (Brooklyn Motoren Werke) here in southern Wisconsin and he solved it - it was the fuel injection nozzles! He claimed it was accumulated carbon build up and lots of partial throttle use that affected the spray pattern.

good luck!
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