Give Jason a call and ask if he still has the KAVs bypass spring spacer in stock - that's worth a try as it will stiffen up the spring

 

Ah Rich, I knew I forgot about that. I'll get on that today.

 

Jason says it won't be a bypass issue with that VGS mod. It's as soon as it comes off vacuum on the scan gauge it shudders and then at 3k it buckaroos. Not nice haha. Think we will give that spacer a go though. I'm starting to wonder if it is a fueling issue.

 

Check the map sensor.

 

Oo I will do,

Just been out, changed the coilpack and wires and also cable tied open the bypass and it was still doing it! It's mostly as I throttle on now and steadily calms down through the revs. Traction control on and off makes no difference.

 

Map sensor on the front of the inlet. Take it off and clean it... See if it make a difference.

 

I'll go and check now, give it a blast of brake cleaner. Do these fail often?

 

Every now and then, Dealer should get you one pretty quick and is pretty straight forward to replace

 

Just had it off, looked fairly clean and no sign of damage but gave it a clean anyway. Will give it a try later when I head out. If it has failed it will be hard to tell by looking at it anyway. Is this what tells you intake temperature? Because if so it's working ok on my scan gauge.

 

Just took a spirited drive to work and i think it's a lot better, didn't seem to do it, maybe very very slightly but fingers crossed it is a lot better. It is hard to tell as work is only 10 minutes drive. Will be interesting to see it when cold.

 

Go and buy a map sensor. £35 I think. There's 2 different types, make sure you give them the part number.

 

Do you think it is temperamental?

 

After a drive home it does feel a little better, seems to have stopped it at 3k but still does it slightly on first instance of hard throttle. I might change the sensor as suggested see how I get on.

 

Map sensor is £40 from BMW and will take approx 5 days to arrive (I know this as I went to get one last week).

 

Thanks for that, will see how it goes. Will get one eventually.