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Old 08-13-2008, 02:31 PM   #1 (permalink)
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Date registered: Dec 2007
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Check Engine Code P0300

My check engine light just came on and i have a code reader and it detected error code P0300 in the book it described it as Misfire cylinder i reset the code to see if it will come back but I just want to know if anyone got this code before and what was the damage associated just tryin to get prepared for the worst.
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Old 08-13-2008, 02:42 PM   #2 (permalink)
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That is the one for random or multiple misfires, i.e. not tied to any one cylinder.

Is the car running okay otherwise? Had you just purchased gas? Bad gas can trip things up.

If it comes back, the fuel filter is always a good thing to check as well. It's possible the CPS could toss that code as well if it's acting up.

You don't mention miles on the car or other maintenance that is due or past due, so if you post back with it please provide all that detail -- and if you could it is helpful if you could do that in some structured way or outline rather than a single packed paragraph, it sure makes things easier to read and follow.

Take care and enjoy the ride,
Greg
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Old 08-14-2008, 08:46 AM   #3 (permalink)
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Well just last week I just had my radiator replaced the week before that I had an oil change done plus old fuel filter replaced as well i have 134,769 on the dash. The car still runs smooth but like you said it might of been some bad gas is what I'm thinkin I reset the code so far so good it hasnt come back so I will keep my fingers crossed.




Quote:
Originally Posted by gregs210 View Post
That is the one for random or multiple misfires, i.e. not tied to any one cylinder.

Is the car running okay otherwise? Had you just purchased gas? Bad gas can trip things up.

If it comes back, the fuel filter is always a good thing to check as well. It's possible the CPS could toss that code as well if it's acting up.

You don't mention miles on the car or other maintenance that is due or past due, so if you post back with it please provide all that detail -- and if you could it is helpful if you could do that in some structured way or outline rather than a single packed paragraph, it sure makes things easier to read and follow.

Take care and enjoy the ride,
Greg
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Old 08-14-2008, 11:31 AM   #4 (permalink)
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At that mileage you should do plugs and O2 sensors if not already, they are waaaaayyyy past due.
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Old 08-14-2008, 12:56 PM   #5 (permalink)
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Actually...

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Originally Posted by gregs210 View Post
At that mileage you should do plugs and O2 sensors if not already, they are waaaaayyyy past due.
the OP's car is powered by the twin-cam M119, which has a spark plug interval of 30K miles, so if the car has been maintained per the factory service regimen, he is half way between plug changes. If not, a look see would be in order.

The factory service booklet for the 1997 E-420 actually does not specify a service interval for the O2 sensors, but 100K would seem prudent.

The most likely cause of the misfire is a coil pack going south... this can cause a P0300 code to be recorded. A failing coil pack on these engines seems to generate "sympathetic" misfires on other cylinders... go figure.

JR
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Old 08-14-2008, 06:23 PM   #6 (permalink)
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Quote:
Originally Posted by gregs210 View Post
At that mileage you should do plugs and O2 sensors if not already, they are waaaaayyyy past due.
Hey Greg,

I asked my SA about O2 sensors being that I am at 93500 miles on my car and he said he has seen W210's go up to 150k miles or more before needing new ones. Suggested to wait until the they trigger a CEL light as they are expensive if done by MB dealer or indy in our area (not much cheaper). I would never take it to any old garage to do it and I think I would have indy or dealer do as I am not DYI. What are your thoughts on this? I already have new spark plugs that I did a few months ago. Your expertise is always appreciated!
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Old 08-14-2008, 06:42 PM   #7 (permalink)
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My 97-E420 had error codes P0300, P0301. Sure enough, #1 coil pack was bad. Replace it and also replaced connectors on all cylinders. Most connectors were in pretty bad shape (except couple newer ones). While I'm at it, also replaced spark plugs with the Bosch OEM copper plugs. It is a straight forward job, unlike the newer M112, M113 engines which is a royal pain in the rear end.

You might have some cause other than the coil pack. I would however make sure that the spark plugs and the connectors are in tiptop shape.

Shane
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Old 08-14-2008, 06:59 PM   #8 (permalink)
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O2 sensors

are 100k mile wear items much like spark plugs,I changed plugs on a w210 at our plug seminar that raymond and a few other members attended and the plugs had not been changed in over 125k miles,he had no cel either and really did not notice anything ,he sure did note the improvement in mpg when changed.
Same with o2 sensors,by the time they have degraded enough to trip a check engine light you have lost several miles per gallon and potentially by running to rich an air /fuel ratio A/F risk damage or failure to a good set of Cats.
Any good indie can change them,any good guy with tools can change them, any good mechanic of which service advisor's are not,can change them.
Heck even with some basic splicing skills,Greg with his already admitted all thumbscan change them.
Figure out what 2-3 mpg over the next 50k miles adds up to,then add in the potential cats issue at CA approved cat prices and do the math
ohlord
"GOT CODES?"

The op's problem was already solved by Moi over on mbworld.org w210 section,I figured that since the m119 is so prone to water related issues in the plug connectors that maybe he had recently washed his engine or ran through a big puddle.Turns out they had just had a massive rain storm and he had in fact driven through a huge puddle the same day the cel tripped for p0300 code.Dried it off no more codes

change your o2 sensors ,so I don't have to solve your misfire codes and cat failures
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Old 04-13-2009, 08:40 AM   #9 (permalink)
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Unhappy

I have a misfire also on #4......But unlike the orginal poster I changed the plugs and also the coil pack. After about 3 days of running like a DREAM, I hit a bump well it was mor like a ditch lol, And now it shakes again! And what do you know it's #4 again! Any ideas? Oh I'm not trying to hijack this psot but I can't find where to start a new thread! Thanks.
Leroy
Ohhhhh lol.
1997 M-B -E420 Sport
168000 miles
new bosch plus 2 spark plugs
and one used coil pack (which I guess is wahts bad again)
Wwhat do you guys think?
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Old 04-13-2009, 08:55 AM   #10 (permalink)
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Originally Posted by elroyjettson View Post
...I can't find where to start a new thread! Thanks. Leroy...
Go the main W210 page and right about the threads/posts you should see a button that says "New Topic". Click that and follow the instructions. Good Luck!
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