Hi all, I have a 2002 st170 (Bluefin, K&N, Peco cat back). I have a problem with the way the car drives - at around 3k revs the car starts to 'shudder' while accelerating.....it gradually increases speed but doesn't ever 'clear' itself. This is only a recent thing. I have checked the plug gaps (1.30mm) and it has been put on a diagnostic and no faults came up....help me please.......

 

Coilpack?

 

That's what I thought originally but wouldn't it show up on the diagnostic?? the Idle Control Valve was blocked but has been cleaned out too.....

 

Coil Packs dont always show up on diagnostics untill they completly naff..

 

cheers Steve...just ordered one - here's hoping!!

 

Hope it sorts it mate, I have diagnostics which i would have gladly checked yours with but your a bit too far away..

 

coilpack arrived yesterday which 'almost' cured it....it was better but not quite right....took a test drive up to Halfrauds and treated myself to a set of leads and plugs (about 43 quid the lot)...fitted them yesterday afternoon and I'm a happy bunny again...all sorted.....
Thanks for your help Steve/Sam.

 

No Prob mate..