problems with turbo

[mattfas]

i have a seat leon fr 1.8t im having problems with turbo boost when under heavy acceleration in 6th gear the car seems to hesitate it doesnt boost properly the car jerks slightly like im pressing the accelerator up and down it only does this in 5th or 6th gear on motorway under heavy acceleration could it be the maf sensor

 

[evokid]

I had a similar thing on my Audi TT.....I cleaned Maf sensor and changed N75 valve....Fixed mine....But could be any number of things....Boost leak / N75 / Maf sensor / Coil pack? etc etc

 

[sambryant]

what dump valve do you have?

 

[mattfas]

d valve and coil packs

thanks for the replies i recently changed all 4 coil packs because 1 went faulty i was running the car with a split r dump valve on it but changed to standard one as i am trying to sell the car it has the fault with both dump valves the bosch one and the split r what is an n75?cheers

 

[sambryant]

just out of interest put your split r dumpvalve back on, but this time make sure its fully recirculating.
i had the same problem with mine. it was down to a leak in the dumpvale. when i put mine back to fully recirculating it worked fine. by the way i tried everything before, changed th n75 valve, new maf and filter.still didnt fix it. it was the dumpvale all along.