Misfire P0301 UNSOLVABLE M271 C230
Thread Starter
Newbie
Joined: Oct 2019
Posts: 8
Likes: 0
From: Belleville Ontario, Canada
C230
Misfire P0301 UNSOLVABLE M271 C230
I'll start off with what I have replaced:
*Coils
*plugs
*injectors
*fuel pump
*fuel filter
*$12 hose inspected, no leaks
*idler/tensioner/alternator/power steering pump/belt ** (all brand new within the last 2 weeks)**
*supercharger oil filled/changed
*new coolant tank
*full compression test (head is fine, not valves)
*MAF sensor cleaned/inspected
*all fluids changed (oil/transmission/dif)
*all oil cleaned out of inner cooler piping and throttle body (very small amounts)
Now onto the problem.......after replacing all these components, my car is still throwing intermittent P0301 code for cylinder 1 misfire, in which the car shakes violently, sometimes stopping and restarting helps temporarily but the problem always returns.
I love this car,
PLEASE HELP
*Coils
*plugs
*injectors
*fuel pump
*fuel filter
*$12 hose inspected, no leaks
*idler/tensioner/alternator/power steering pump/belt ** (all brand new within the last 2 weeks)**
*supercharger oil filled/changed
*new coolant tank
*full compression test (head is fine, not valves)
*MAF sensor cleaned/inspected
*all fluids changed (oil/transmission/dif)
*all oil cleaned out of inner cooler piping and throttle body (very small amounts)
Now onto the problem.......after replacing all these components, my car is still throwing intermittent P0301 code for cylinder 1 misfire, in which the car shakes violently, sometimes stopping and restarting helps temporarily but the problem always returns.
I love this car,
PLEASE HELP
Junior Member
Joined: Jan 2019
Posts: 15
Likes: 1
C250
I'll start off with what I have replaced:
*Coils
*plugs
*injectors
*fuel pump
*fuel filter
*$12 hose inspected, no leaks
*idler/tensioner/alternator/power steering pump/belt ** (all brand new within the last 2 weeks)**
*supercharger oil filled/changed
*new coolant tank
*full compression test (head is fine, not valves)
*MAF sensor cleaned/inspected
*all fluids changed (oil/transmission/dif)
*all oil cleaned out of inner cooler piping and throttle body (very small amounts)
Now onto the problem.......after replacing all these components, my car is still throwing intermittent P0301 code for cylinder 1 misfire, in which the car shakes violently, sometimes stopping and restarting helps temporarily but the problem always returns.
I love this car,
PLEASE HELP
*Coils
*plugs
*injectors
*fuel pump
*fuel filter
*$12 hose inspected, no leaks
*idler/tensioner/alternator/power steering pump/belt ** (all brand new within the last 2 weeks)**
*supercharger oil filled/changed
*new coolant tank
*full compression test (head is fine, not valves)
*MAF sensor cleaned/inspected
*all fluids changed (oil/transmission/dif)
*all oil cleaned out of inner cooler piping and throttle body (very small amounts)
Now onto the problem.......after replacing all these components, my car is still throwing intermittent P0301 code for cylinder 1 misfire, in which the car shakes violently, sometimes stopping and restarting helps temporarily but the problem always returns.
I love this car,
PLEASE HELP
Sometimes it will throw a P0304 code.
Dealer thinks it maf but it hasn't thrown a code for the MAF.
No answers from anyone. I may leave it at the dealership over night and have them put their scan tool on it.
Junior Member
Joined: Jan 2019
Posts: 15
Likes: 1
C250
Doubt it car runs well after the 30 seconds. I'm leaning towards a new battery.
It still has its original battery from 2013. Car starts up well no slow cranking but I've heard if the battery doesn't have it's full capacity the electronic doesn't like that. Until the alternator kicks in the battery needs full capacity to keep spark and things up to spec.
It still has its original battery from 2013. Car starts up well no slow cranking but I've heard if the battery doesn't have it's full capacity the electronic doesn't like that. Until the alternator kicks in the battery needs full capacity to keep spark and things up to spec.
Thread Starter
Newbie
Joined: Oct 2019
Posts: 8
Likes: 0
From: Belleville Ontario, Canada
C230
Doubt it car runs well after the 30 seconds. I'm leaning towards a new battery.
It still has its original battery from 2013. Car starts up well no slow cranking but I've heard if the battery doesn't have it's full capacity the electronic doesn't like that. Until the alternator kicks in the battery needs full capacity to keep spark and things up to spec.
It still has its original battery from 2013. Car starts up well no slow cranking but I've heard if the battery doesn't have it's full capacity the electronic doesn't like that. Until the alternator kicks in the battery needs full capacity to keep spark and things up to spec.
Super Member
Joined: Sep 2015
Posts: 848
Likes: 87
From: Milwaukee, WI USA
2012 C300 4Matic
Maybe the gap on the cylinder 1 sparkplug is off a bit? Or the coild is bad? Maybe try switching that plug to another cylinder to see if the problem moves. Also might try swapping the coil on that cylinder as well. Try the independently so you would know which one it might be.
Any oil in any of the plug wells when you chanegd them?
Any oil in any of the plug wells when you chanegd them?
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Junior Member
Joined: Jan 2019
Posts: 15
Likes: 1
C250
Maybe the gap on the cylinder 1 sparkplug is off a bit? Or the coild is bad? Maybe try switching that plug to another cylinder to see if the problem moves. Also might try swapping the coil on that cylinder as well. Try the independently so you would know which one it might be.
Any oil in any of the plug wells when you chanegd them?
Any oil in any of the plug wells when you chanegd them?
I tried moving the coils around but the miss didn't follow the coil. Keep in mind this only happens for 20 or so seconds on cold start up and smooths out when the idle drops to say below 1000 rpm.
Thanks
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Thread Starter
Newbie
Joined: Oct 2019
Posts: 8
Likes: 0
From: Belleville Ontario, Canada
C230
**UPDATE**
Got the car back today, turns out there was a bit of oil in the harness and looking at buying new ECU. Will up when part is received and installed.
Thanks everyone for the tips
-Dezairay
Got the car back today, turns out there was a bit of oil in the harness and looking at buying new ECU. Will up when part is received and installed.
Thanks everyone for the tips
-Dezairay
