knock sensor fault code / poor acceleration

P

Pickster

Member
 West Yorkshire
Hi all,
I'm new to the forum but have recently encountered an issue that someone maybe able to assist with.

2011 E89 23i Msport.

Recently purchased been running well and have been enjoying the car.
changed fuel from standard shell to V power ( nor sure what the previous owner was running on).

Took the car on a run to Scotland over the weekend from Leeds , firs leg obviously all motorway driving A1, A66 M6 etc. car was running great. came off the motorway outside Glasgow and car developed a hesitation when accelerating. Parked the car up at the hotel for an hour then took it out to test it. car ran fine sigh of relief. Next morning headed out to Loch Lomond bit of motorway driving then onto the A82 same issue hesitation on acceleration, also noticed oil temp was lower than normal and took a lot longer to warm up.
now in the middle of nowhere parked car up for half an hour or so and set off again to next hotel on Loch Fyn. Car ran fine, Oil temp rose to where it would normally be. Car ran fine rest of day. next morning headed south car ran fine. Ran fine all the way to next stop over and then again the next day back to Leeds.

Got back home and pal put a diagnostic reader on the car. Only fault that came up was Knock sensor fault code 2.

Any Thoughts ?
 
Pickster said:
Hi all,
I'm new to the forum but have recently encountered an issue that someone maybe able to assist with.

2011 E89 23i Msport.

Recently purchased been running well and have been enjoying the car.
changed fuel from standard shell to V power ( nor sure what the previous owner was running on).

Took the car on a run to Scotland over the weekend from Leeds , firs leg obviously all motorway driving A1, A66 M6 etc. car was running great. came off the motorway outside Glasgow and car developed a hesitation when accelerating. Parked the car up at the hotel for an hour then took it out to test it. car ran fine sigh of relief. Next morning headed out to Loch Lomond bit of motorway driving then onto the A82 same issue hesitation on acceleration, also noticed oil temp was lower than normal and took a lot longer to warm up.
now in the middle of nowhere parked car up for half an hour or so and set off again to next hotel on Loch Fyn. Car ran fine, Oil temp rose to where it would normally be. Car ran fine rest of day. next morning headed south car ran fine. Ran fine all the way to next stop over and then again the next day back to Leeds.

Got back home and pal put a diagnostic reader on the car. Only fault that came up was Knock sensor fault code 2.

Any Thoughts ?
Click to expand...

Hi, I’d probably change the knock sensor-a faulty one would probably take the edge off the engine performance.
Rob
 
If you have a faulty knock sensor the ECU will either retard the ignition (reducing performance) if it is sensing 'false knocks'. Or if it not sensing any knocking it will advance the ignition (increasing performance), as happens when VPower is used as it resists knocking.
However the ECU usually takes a tank full or two of pure Vpower to sort itself out.
If the ECU senses the knock sensor as 'missing' broken wire or similar it will default to a set value.

Unlikely that the fuel change is causing this, just get the sensor changed (I think there are two but not sure).
 
You must log in or register to reply here.
Back
Top Bottom