P0301 code HELP

[lee.911]

Ok here are the problems I got.its a 54 plate c180. I replaced the breather hose under the air filter a few months ago but now the car is throwing up a p0301 code and running rough with similar symptoms as the split breather hose caused ie lumpy idle,poor acceleration and general running like a bag of s@#t.

I suspected that the breather hose had somehow come loose but after taking the air filter back off its fine so seeing as I had it stripped down I cleaned the MAF with some electrical contact cleaner for good measure as it looked clean anyway but thought it might help. I cleared the p0301 code and took it for a spin and normal driving it was fine but as soon as you put your foot down it stutters and the engine management light comes back on and it runs like a bitch.

I disconnected the MAF and cleared the EML again and this time went for a spin again,it seemed more responsive and smoother straight away but when accelerating it still seemed a little hesitant but the EML didn't come back on so what would you guys recon it is would you all say MAF or could it be the CAT.

 

[AndyPCD]

Did you replace both parts of the pipe and the valve in the block that they connect to

 

[lee.911]

Did you replace both parts of the pipe and the valve in the block that they connect to

Only replaced the single hose like a elongated z shape that's directly under the air filter housing,didn't know about any others ?.the hose I'm on about is the one that runs from the supercharger and is supposedly a common fault on the m271 engines.

 

[AndyPCD]

Yeah there is one below the valve. It is partly hidden by the kompressor.

Easy test is with the car running spray a bit of brake cleaner down there and see if it affects the running.

 

[lee.911]

Yeah there is one below the valve. It is partly hidden by the kompressor.

Easy test is with the car running spray a bit of brake cleaner down there and see if it affects the running.

How easy is it to get to and can I see it from underneath the car,and thanks for taking the time to reply to me .

 

[AndyPCD]

To get to it to replace you have to take the inlet and kompressor out of the car b

 

[lee.911]

To get to it to replace you have to take the inlet and kompressor out of the car b

That's me f@#*ed then ,only got basic skills and very limited amount of tools so looks like I need to get it booked in to a local specialist then if that is the problem.you mentioned about spraying brake cleaner or something what should I look for ie a change in the engine noise or something,sorry if I seem a bit vague but have very basic mechanical knowledge.

 

[AndyPCD]

Where abouts are you. Might be able to recommend someone to go to.

If you spray a bit of brake cleaner down where the pipe is and its split the revs should rise and it would probably run better for a few seconds.

 

[lee.911]

Where abouts are you. Might be able to recommend someone to go to.

If you spray a bit of brake cleaner down where the pipe is and its split the revs should rise and it would probably run better for a few seconds.

Thanks for that will give it a go .

Swansea in South Wales.

 

[AndyPCD]

Yeah give that a go and see what happens first.

 

[lee.911]

Yeah give that a go and see what happens first.

Gave it a try and no diff in the running of the engine noise or rpm at idle. The EML light will only come on if I put my foot down at about 3000 rpm when driving but it does not come on when revving at 3000 rpm when at a standstill.the engine seems to be sweet until I drive it and go to accelerate quickly the EML light comes on and it runs like a dog as if its only running on 3 cylinders but as soon as I reset the EML and start it up it runs smooth as if nothing is wrong with it .

 

[Huggybear]

As someone said before there is two pipes down the side the Z type one and the other more difficult one which has a check valve in it which blocks and causes similar problems

 

[amin1971]

ive got the same issue with a c180k ive got ! any help would be appreciated

 

[AndyPCD]

ive got the same issue with a c180k ive got ! any help would be appreciated

Have you had the breather hoses replaced on yours yet