hi. i have just bought a 97 sti i have noticed at about 4500 revs it starts to hold back and judder badly, i think its the fuel cut defender coming on.

i have noticed the dump valve hissing on idle if i play about with it stops but it soon starts again.

would this boost leak cause the fuel cut. im not sure what its boosting at as its not on the road yet, but would be nice to get it sorted before i start using it next month if possible.

 

I had a similar hesitation on mine, and it turned out to be a ht lead. So might be worth checking your plugs, leads, and coil packs.

 

sorry just reading your messages i to have hesitation on my 00 wagon have been told to replace turbo breather pipe as this has tiny crack in it

 

certainly a possiblity. i probably wont know for sure untill its on the road so i can test it properly

 

Can you go above 4500rpm?

Question was meant for the OP

 

yes over 4500rpm lovely smooth wont stop pulling but below feels like it is hunting all the time

 

just changing the subject a minute is anyone going to the rallyday at castlecombe on sat if so will be good to meet?

 

Hi guys,

Maybe coincidence but this sounds a bit like my problem over on this other thread - could you please take a look?

Thanks!

https://www.scoobynet.com/drivetrain...juddering.html