2003 Mercedes C320 misfiring cylinder - Mercedes-Benz Forum
 
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post #1 of 7 (permalink) Old 07-26-2019, 09:44 AM Thread Starter
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Vehicle: 2003 Mercedes C320 3.2 Coupe
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2003 Mercedes C320 misfiring cylinder

Hello all,

I recently got a check engine light, loss of acceleration and slight shake. So, I pulled to the side and restarted the car and everything was working normally again.
Upon reviewing the code, it showed P0300, P0302, P0303. So, I suspect cylinder 2 and cylinder 3 misfired and since it was two cylinders, it threw P0300 which indicates multiple cylinder misfiring.

So, I parked it in my garage and today the CEL is gone and the car is driving normally.

So, can you please tell?

1) If I should be worried and have a mechanic immediately look at my 2 and 3 cylinders or all of them??
2) Once the cylinder misfire occurred, does it disable cylinder 2 and 3 to avoid further damage and leaving the regular power delivery from rest of the four cylinders?
3) Once the cylinder misfire occurred, does it keep misfiring all the time or will it misfire in certain circumstances like high rpm, high speed, fast acceleration or something?

Any estimate on what would it take to fix it and any estimate on reasonable cost to have it fixed?

Thank you
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post #2 of 7 (permalink) Old 07-26-2019, 07:31 PM
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Welcome to the forum! There are many causes for misfires, but a misfire on one cylinder won't shut down another. If it happens again, I'd check the plugs, wires and coils for any obvious problems. Also, you can try swapping plugs, coils and wires but ONE AT A TIME with a misfiring cylinder to a properly operating one to eliminate those parts.

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post #3 of 7 (permalink) Old 08-14-2019, 02:54 PM Thread Starter
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@rudeney

Thank you. I had the flashing CEL and it stayed on. The next day, the light was gone and its' been a couple of weeks that the light hasn't come back and it's driving normally with slight rough idle.
Could it be temporary or is it waiting for something big to happen?
I went to the mechanic but he said, I should wait until I get a CEL again and come back to them so that they can diagnose and fix the issue.
I am not sure if I should go to some other mechanic or do as the mechanic told me since the CEL went away and now its been 2 weeks without any issue except slight rough idle.
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post #4 of 7 (permalink) Old 08-15-2019, 06:59 PM
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A flashing MIl means that is is currently misfiring. An illuminated MIL means there is an active stored code. If the condition stops occurring, the MIL will extinguish after 5-1 start/run/stop cycles. However, the code will still be stored, so it's still worth getting it scanned.

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post #5 of 7 (permalink) Old Today, 07:31 AM
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Originally Posted by Sazal Prdn View Post
Hello all,

I recently got a check engine light, loss of acceleration and slight shake. So, I pulled to the side and restarted the car and everything was working normally again.
Upon reviewing the code, it showed P0300, P0302, P0303. So, I suspect cylinder 2 and cylinder 3 misfired and since it was two cylinders, it threw P0300 which indicates multiple cylinder misfiring.

So, I parked it in my garage and today the CEL is gone and the car is driving normally.

So, can you please tell?

1) If I should be worried and have a mechanic immediately look at my 2 and 3 cylinders or all of them??
2) Once the cylinder misfire occurred, does it disable cylinder 2 and 3 to avoid further damage and leaving the regular power delivery from rest of the four cylinders?
3) Once the cylinder misfire occurred, does it keep misfiring all the time or will it misfire in certain circumstances like high rpm, high speed, fast acceleration or something?

Any estimate on what would it take to fix it and any estimate on reasonable cost to have it fixed?

Thank you. Visit this link to know how long we can drive with a misfiring cylinder that you may concern
Here are the links for your reference. Hope it can help you to figure the answer.

Diagnosing Misfires
https://axleaddict.com/auto-repair/E...and-Strategies
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post #6 of 7 (permalink) Old Today, 08:25 AM
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How many miles are on the car?
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post #7 of 7 (permalink) Old Today, 03:13 PM
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Quote:
Originally Posted by Sazal Prdn View Post
Hello all,

I recently got a check engine light, loss of acceleration and slight shake. So, I pulled to the side and restarted the car and everything was working normally again.
Upon reviewing the code, it showed P0300, P0302, P0303. So, I suspect cylinder 2 and cylinder 3 misfired and since it was two cylinders, it threw P0300 which indicates multiple cylinder misfiring.

So, I parked it in my garage and today the CEL is gone and the car is driving normally.

So, can you please tell?

1) If I should be worried and have a mechanic immediately look at my 2 and 3 cylinders or all of them??
2) Once the cylinder misfire occurred, does it disable cylinder 2 and 3 to avoid further damage and leaving the regular power delivery from rest of the four cylinders?
3) Once the cylinder misfire occurred, does it keep misfiring all the time or will it misfire in certain circumstances like high rpm, high speed, fast acceleration or something?

Any estimate on what would it take to fix it and any estimate on reasonable cost to have it fixed?

Thank you
I'd try swapping the ignition coils and wires around.

The firing order is:
3 6
2 5
1 4
(front of car)
Perhaps 2 to 1, and 3 to 4. Then reset the CEL light. If the misfire becomes 1 and 4 afterwards, then its most likely bad ignition coils.

Also, If your car has never had the MAF sensor changed, I'd change that with a Bosch unit($110 on ebay). Cheap part, all things considered and a relatively easy install(see youtube).

I just had this issue on my car, and car is running great again with all new coils and a MAF change.

G'luck.
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