R56 Car bogs under acceleration
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1st Gear
Joined: Mar 2018
Posts: 19
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Car bogs under acceleration
Hi all !
My problem is a bit particular as I couldn't find a lot of infos on this topic:
I have a 2011 MCS (N14) euro version with 67000 km on the clock
A few weeks ago I started feeling that the car bogs under half/full acceleration and when I really go on it, it misfires with a little clicking sound. I went for a diagnostic and they found 4 codes:
super knock, fuel cut off due to super knock, misfire in 3 cylinders (1,2,4) and bad coil (1st one, the one on the chain side). Changed the coil and plugs and all codes disappeared to never come back.
However I can still feel the car bogging and performance restricted like a fuel starve or something is strangling the engine, yesterday I went for another diagnostic and it threw no codes. the car doesn't have a fuel filter as it is euro version and the fuel pump pressure seems fine after they measured it while I was driving.
I sea foamed it through the pcv hose like a lot of videos on youtube and ran injector cleaners through the tank, felt a lot better but the problem is still there. (No CEL and idle is perfect).
I tried everything but nothing seems to work
My problem is a bit particular as I couldn't find a lot of infos on this topic:
I have a 2011 MCS (N14) euro version with 67000 km on the clock
A few weeks ago I started feeling that the car bogs under half/full acceleration and when I really go on it, it misfires with a little clicking sound. I went for a diagnostic and they found 4 codes:
super knock, fuel cut off due to super knock, misfire in 3 cylinders (1,2,4) and bad coil (1st one, the one on the chain side). Changed the coil and plugs and all codes disappeared to never come back.
However I can still feel the car bogging and performance restricted like a fuel starve or something is strangling the engine, yesterday I went for another diagnostic and it threw no codes. the car doesn't have a fuel filter as it is euro version and the fuel pump pressure seems fine after they measured it while I was driving.
I sea foamed it through the pcv hose like a lot of videos on youtube and ran injector cleaners through the tank, felt a lot better but the problem is still there. (No CEL and idle is perfect).
I tried everything but nothing seems to work
4th Gear
Joined: Jul 2013
Posts: 355
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Intersting video for small turbo engines https://www.youtube.com/watch?v=soJe...ature=youtu.be
1st Gear
Joined: Jun 2008
Posts: 33
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From: CA 92807
You are due for an intake valve de-carbon. I did mine first at 65K miles and it was way past due. I just did it again at 90K miles (walnut blast) and it made a big difference in drivability and acceleration over 3K RPM.
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1st Gear
Joined: Mar 2018
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Hey guys, thanks for your replies.
Yes I did change the air filter 1k km ago but it did it before.
I don't think it is the HPFP as my local garage checked it and they said pressure is fine.
Also, it is intermittent, I want to sell the car every time it does it but some days like today for example, I did 20 km to work and back to my house and it was smoother than ever.
On other days I can really feel it struggle and bog down like something is strangling it. I checked everything, I don't know what it is.
Yes I did change the air filter 1k km ago but it did it before.
I don't think it is the HPFP as my local garage checked it and they said pressure is fine.
Also, it is intermittent, I want to sell the car every time it does it but some days like today for example, I did 20 km to work and back to my house and it was smoother than ever.
On other days I can really feel it struggle and bog down like something is strangling it. I checked everything, I don't know what it is.
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4th Gear
Joined: Jan 2018
Posts: 483
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Needs walnut blast on intake valves. These valves gunk up very easily due to direct injection and poor pcv oil/air re-circulation designs. I do mine every 40k miles, and each time it's opened up, I wish I'd be doing it earlier. I bought a walnut blasting kit due to this reason also. Dealership will rob you for this service, it's worth it if I buy the kit and do at least 2-3 blasts and I'll get savings that way compared to dealership. After cleaning, it took my car a week to start changing the fuel targets and feel smooth again. Bogs much seldom now.
My car is at 100k mile just now, I plan to walnut blast on every oil change.
My car is at 100k mile just now, I plan to walnut blast on every oil change.
3rd Gear
Joined: Jun 2017
Posts: 247
Likes: 16
From: Whorelando florida
To know for sure you need to graph your data while driving. Then you’ll be able to see the correlation between afr, maf readings, map readings and fuel pressure at different rpms.
If you post post up some readings we could provide further assistance.
Just bcause they got got a good reading on the fuel pump doesn’t mean that it’s not cutting out under heavy loads etc.
I’d say it has something to do with maf, map, 02 sensors, throttle body or fuel pump with the way you’re describing it.
If you post post up some readings we could provide further assistance.
Just bcause they got got a good reading on the fuel pump doesn’t mean that it’s not cutting out under heavy loads etc.
I’d say it has something to do with maf, map, 02 sensors, throttle body or fuel pump with the way you’re describing it.
3rd Gear
Joined: Jun 2017
Posts: 247
Likes: 16
From: Whorelando florida
Hey guys, thanks for your replies.
Yes I did change the air filter 1k km ago but it did it before.
I don't think it is the HPFP as my local garage checked it and they said pressure is fine.
Also, it is intermittent, I want to sell the car every time it does it but some days like today for example, I did 20 km to work and back to my house and it was smoother than ever.
On other days I can really feel it struggle and bog down like something is strangling it. I checked everything, I don't know what it is.
Yes I did change the air filter 1k km ago but it did it before.
I don't think it is the HPFP as my local garage checked it and they said pressure is fine.
Also, it is intermittent, I want to sell the car every time it does it but some days like today for example, I did 20 km to work and back to my house and it was smoother than ever.
On other days I can really feel it struggle and bog down like something is strangling it. I checked everything, I don't know what it is.
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