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Old 01-13-2002, 10:40 PM
300EVIL's Avatar
Moderator Incarnate
Join Date: Apr 2000
Location: Lake Geneva, WI.
Posts: 1,676
Cold start easy, Warm start hard on my E320

Now that my Florida E320 is experiencing cold Wisconsin weather it is starting to have some problems. first problem is it starts easy when cold but warm starts are almost embarrassing. I don't think its the fuel pump or filter but that is where I was going to start. any suggestions?? Also, where is the fuse for the air pump. this was originally a CA model and I suspect that the air pump is making that horrible noise in the morning. your comments will be greatly appreciated!
Thanks in Advance.

Current Stable:
01 ML55 AMG
92 500E (a few mods)
87 300E (lots of mods)
00 Chevy 3500HD Diesel Box Truck
68 18' Donzi Marine
06 GT i-Drive7 1.0 Mountain Bike (with GPS!)

PREVIOUSLY OWNED:83 300SD, 87 420SEL, 88 420SEL, 90 420SEL, 86 560SEL, 86 190E 2.3-16V AMG, 94 E320

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Old 01-13-2002, 11:17 PM
David C Klasse's Avatar
CheFrac is Back!
Join Date: Jan 2001
Location: Mission Hills in the City of San Diego
Posts: 2,355
You must be more specific. WHat do you mean... does the engine turn, but not catch, when warm? Or what?
First thought is the OVP......
2006 E350 w/ 155k miles (Daily Driver)

1993 300E 3.2L Sedan w/ close to about 300k miles
2003 E500 Brilliant Silver (Had 217k miles when totalled!)
1989 300E with 289,000 miles (had for <1 yr while in HI)
03 CLK 500 cabrio (Mom's)
2006 C230k (Dad's)
1999 S420 (Mom's/Dad's)
2000 C230k Sport sedans
2001 CLK320 Cabrio (Mom's)
1995 C280 My First Mercedes-Benz... (155k miles. EXCEPTIONAL AUTOMOBILE. Was Very hard to let go of!)
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Old 01-14-2002, 12:31 PM
300EVIL's Avatar
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Join Date: Apr 2000
Location: Lake Geneva, WI.
Posts: 1,676
yes, the engine dose not catch. i usually have to floor the gas and repeat the ignition process 3 or 4 times before it starts.
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Old 01-14-2002, 12:49 PM
G-Benz's Avatar
Razorback Soccer Dad
Join Date: Apr 2001
Location: Dallas/Fort-Worth
Posts: 5,711
I figure if it's a fuel delivery problem, it would occur whether the engine is warm or cold...I too believe that the OVP may be what's causing the problem...
2009 ML350 (106K) - Family vehicle
2001 CLK430 Cabriolet (80K) - Wife's car
2005 BMW 645CI (138K) - My daily driver
2016 Mustang (32K) - Daughter's car
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Old 01-14-2002, 05:55 PM
Posts: n/a
I had the same problem on my 300se and changed lots of parts,
and did tune up distributor cap,wires ,sparkplugs and no difference after 3 months I tried techron fuel injection cleaner and
the car would start when hot first try (I felt like im in heaven).
As soon as I refield the tank the problem came back then I thought as long there was fuel injection cleaner for like two weeks the car started hot first try with no problem. Then I decided to take it to a mercedes shop and told them my story what's going on they said the solution to my problem is to force some kind of special cleaning solution through the injectors from top of the rail where the injectors get fuel not thru the gas tank. I paid $119.00 in Ohio and that completely eliminated the hot start problem and its going on three months since the dealer cleaned them.
Before you spend your hard earned money try a bottle of good fuel injection cleaner (always good idea to change oil after)
if the problem goes away (cheap way) then take it to a shop so that they can clean em thru the fuel injection rails(MoreExpensive). Good luck
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Old 01-15-2002, 09:00 PM
300EVIL's Avatar
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Join Date: Apr 2000
Location: Lake Geneva, WI.
Posts: 1,676
well.... I checked the OVP relay, the fuse and checked it with multimeter and a 12v sorce. works fine. I use Jectron fuel injector cleaner every 3 months. Any other suggestions??
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Old 03-24-2005, 08:18 AM
Posts: n/a

did you ever fix your problem with difficult warm starting?
i'm having the same problem.
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Old 03-24-2005, 08:31 AM
Registered User
Join Date: Oct 2004
Location: Panama City beach, FL
Posts: 61
Me, too! I've changed the filter, accumulator, on and on... Sometimes it won't start at all when hot.
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Old 03-24-2005, 11:58 AM
forp's Avatar
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Join Date: Jul 2003
Location: Sebastopol, CA
Posts: 324
Same problem on my '96 c280 resolved with new fuel regulator. Diagnosed by pulling the vacuum line to the regulator and finding drops of fuel. It should be dry. Easy DIY.
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Old 03-25-2005, 09:47 AM
Registered User
Join Date: Feb 2005
Posts: 68
same deal

I have a 300ce 24v with same problem.....I replaced the EHA valve, Idle Control Valve, the fuel pump/filter, the OVP fuse, and used fuel injection cleaner.....All these replacements helped the motor get to where it is---a whole lot smoother...but, i still have the warm start problem...usually takes between 2-4 attempts for the car to run....It starts each time but sputters to death....Something is definitely bleeding the injection system....most likely the injectors are leaking in my car....go of luck

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Old 03-25-2005, 11:54 AM
Posts: n/a
Exclamation The Best Solution!

Hey, I used to live there in the Lake Geneva area. One winter night, the wind chill factor made it 70 below, and I got called out to work. That night, nearly waist deep in snow, I found the solution!

I got the hell out of there! I live next to the Pacific Ocean now and the coldest it gets is about 45 above at night!

Not only does my car like it better, I do!

No more cold start problems.

After all, I can fly in there in the summer to visit my mother and go to Hogs & Kisses for a long lunch. That and International Antiques, what else does it have to stay there for?
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Old 12-16-2008, 10:15 PM
Registered User
Join Date: Aug 2008
Location: Louisville Ky
Posts: 81
Replace the crankshaft sensor,it does not throw a code.

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