2010 e350 - Major, intermittent misfiring, p0300 code
Thread Starter
Newbie
Joined: Dec 2022
Posts: 5
Likes: 2
From: New Hampshire, USA
2010 Mercedes-Benz e350
2010 e350 - Major, intermittent misfiring, p0300 code
Hi everyone-
let me preface by saying I don't really know what i'm doing when it comes to autos - i'm capable, but uneducated on such matters
also, a layoff hit my household so taking it into the shop is less than ideal
driving a 2010 e350 base. It's doing a few funny things which my research led me to believe is a bad coil:
About half the time it's fine, no light, no chug, no loss of power, quiet idling at 500 rpm
Sometimes it'll idle weird when i start it, it'll bounce from 400 rpm to 1200 rpm and make a 'hair dryer' sound, itll do it for about 10 seconds and then it seems to 'find its timing' and settle into a nice, quiet idle
Other times, it throws a check light and i can feel a good chugging and a decent loss of power, in line with a single, consistent misfire
Then rarely, i'll start it and it'll feel like it's gonna explode. Check engine light does it's blinking bit. Heavy enough chugging to see the car shake from the outside, it just about doubles how much it shakea if you try putting it in gear.
So, i did my research, went to order my new coil and took it for an OBD2 test to identify the coil:
p0300 - random misfire detected
So it's definitely a misfire but for some reason the computer can't identify which piston? Does this rule out a coil? Any other relatively simple things i can try to diagnose this?
Lol should i just buy 5 more coils?
let me preface by saying I don't really know what i'm doing when it comes to autos - i'm capable, but uneducated on such matters
also, a layoff hit my household so taking it into the shop is less than ideal
driving a 2010 e350 base. It's doing a few funny things which my research led me to believe is a bad coil:
About half the time it's fine, no light, no chug, no loss of power, quiet idling at 500 rpm
Sometimes it'll idle weird when i start it, it'll bounce from 400 rpm to 1200 rpm and make a 'hair dryer' sound, itll do it for about 10 seconds and then it seems to 'find its timing' and settle into a nice, quiet idle
Other times, it throws a check light and i can feel a good chugging and a decent loss of power, in line with a single, consistent misfire
Then rarely, i'll start it and it'll feel like it's gonna explode. Check engine light does it's blinking bit. Heavy enough chugging to see the car shake from the outside, it just about doubles how much it shakea if you try putting it in gear.
So, i did my research, went to order my new coil and took it for an OBD2 test to identify the coil:
p0300 - random misfire detected
So it's definitely a misfire but for some reason the computer can't identify which piston? Does this rule out a coil? Any other relatively simple things i can try to diagnose this?
Lol should i just buy 5 more coils?
Out Of Control!!
Joined: Jul 2003
Posts: 15,901
Likes: 4,632
From: North Scottsdale, AZ
'71 Pinto
212 should be posting here: https://mbworld.org/forums/e-class-w212-109/ have someone erase all stored codes and do a quick test using Xentry (MB diagnostics).
MBWorld Fanatic!
Joined: Feb 2014
Posts: 6,190
Likes: 1,550
From: MA
2008 E350 4Matic, 2011 E350 4matic
Basic misfires are the spark plugs and then the coils and then if it's still there you start looking for other reasons. You should get a code scanner that does MB specific codes. Could be many other reasons but without the MB specific codes, could be anything. The 2010 is still the M272 engine which has intake manifold issues. You could have a pending code that doesn't show up on a regular OBDII scanner or it could be one of the sensors. Here's a cheap code scanner that does all MB specific codes and it's about $62 now.
Member
Joined: Dec 2021
Posts: 192
Likes: 50
E350 4matic Wagon
Not enough info
Hi everyone-
let me preface by saying I don't really know what i'm doing when it comes to autos - i'm capable, but uneducated on such matters
also, a layoff hit my household so taking it into the shop is less than ideal
driving a 2010 e350 base. It's doing a few funny things which my research led me to believe is a bad coil:
About half the time it's fine, no light, no chug, no loss of power, quiet idling at 500 rpm
Sometimes it'll idle weird when i start it, it'll bounce from 400 rpm to 1200 rpm and make a 'hair dryer' sound, itll do it for about 10 seconds and then it seems to 'find its timing' and settle into a nice, quiet idle
Other times, it throws a check light and i can feel a good chugging and a decent loss of power, in line with a single, consistent misfire
Then rarely, i'll start it and it'll feel like it's gonna explode. Check engine light does it's blinking bit. Heavy enough chugging to see the car shake from the outside, it just about doubles how much it shakea if you try putting it in gear.
So, i did my research, went to order my new coil and took it for an OBD2 test to identify the coil:
p0300 - random misfire detected
So it's definitely a misfire but for some reason the computer can't identify which piston? Does this rule out a coil? Any other relatively simple things i can try to diagnose this?
Lol should i just buy 5 more coils?
let me preface by saying I don't really know what i'm doing when it comes to autos - i'm capable, but uneducated on such matters
also, a layoff hit my household so taking it into the shop is less than ideal
driving a 2010 e350 base. It's doing a few funny things which my research led me to believe is a bad coil:
About half the time it's fine, no light, no chug, no loss of power, quiet idling at 500 rpm
Sometimes it'll idle weird when i start it, it'll bounce from 400 rpm to 1200 rpm and make a 'hair dryer' sound, itll do it for about 10 seconds and then it seems to 'find its timing' and settle into a nice, quiet idle
Other times, it throws a check light and i can feel a good chugging and a decent loss of power, in line with a single, consistent misfire
Then rarely, i'll start it and it'll feel like it's gonna explode. Check engine light does it's blinking bit. Heavy enough chugging to see the car shake from the outside, it just about doubles how much it shakea if you try putting it in gear.
So, i did my research, went to order my new coil and took it for an OBD2 test to identify the coil:
p0300 - random misfire detected
So it's definitely a misfire but for some reason the computer can't identify which piston? Does this rule out a coil? Any other relatively simple things i can try to diagnose this?
Lol should i just buy 5 more coils?
spark plugs need changed every 100k miles and some might say more - when you pull them is there oil on any of them. Note which ones if any.
If a plug is not torqued properly you can get a misfire
if a coil is not connected firmly you can get a misfire
if the camshaft magnets have not been changed that may need to be done
these cars have many jobs that can be done relatively inexpensively by yourself - but letting maintenance go or winging it piece by piece is going to create a migraine and cash exodus
Thread Starter
Newbie
Joined: Dec 2022
Posts: 5
Likes: 2
From: New Hampshire, USA
2010 Mercedes-Benz e350
Hey everyone,
Thanks for the replies.
Mileage is 123k, i've owned it since august and (as it was disclosed to me) the previous owner kept up on all annual maintenance with no major repairs late mileage maintenance.
I haven't been able to get into a shop that can run the MB diag but the kid who ran the codes last time seemed like a bit of a numbskull so I borrowed a friend's OBD2 and found out the tech i dealt with didn't know how to scroll through multiple codes
So the codes it's ACTUALLY throwing:
p0300 p0301 p0205 p0305 p0300 p0305 p0205 p0302
So the problem is at least as far down the system as my fuel injectors? Will update when i get the factory diagnostics.
I'm assuming my local MB dealer is gonna turn me away with no warranty?
Thanks for the replies.
Mileage is 123k, i've owned it since august and (as it was disclosed to me) the previous owner kept up on all annual maintenance with no major repairs late mileage maintenance.
I haven't been able to get into a shop that can run the MB diag but the kid who ran the codes last time seemed like a bit of a numbskull so I borrowed a friend's OBD2 and found out the tech i dealt with didn't know how to scroll through multiple codes
So the codes it's ACTUALLY throwing:
p0300 p0301 p0205 p0305 p0300 p0305 p0205 p0302
So the problem is at least as far down the system as my fuel injectors? Will update when i get the factory diagnostics.
I'm assuming my local MB dealer is gonna turn me away with no warranty?
Member
Joined: Feb 2017
Posts: 248
Likes: 36
From: L.A., Moscow, NYC, San Diego, Baja
1998 E320 Wagon, 2003 W211 E500, 2003 W211 E500, 1999 W210 E55 AMG
In addition to the electrical points offered above, if the misfire is intermittant isolated to a single cylender, first struck me as a fuel issue, injector perhaps.
MBWorld Fanatic!
Joined: Feb 2014
Posts: 6,190
Likes: 1,550
From: MA
2008 E350 4Matic, 2011 E350 4matic
Well according to his error codes, it's in 3 cylinders with one error in the fuel injector so in addition, I'd also check the fuel pressure and see if the fuel pump is good. And I'd also get a scanner that does MB specific codes that I mentioned before. There are probably other MB specific codes that are not showing up on a basic OBDII scanner that will better help to pinpoint the issue. Otherwise you're just throwing parts at the problem.
