Loss of boost t5r manual.

[lurchio2]

Hi. Parked car up for a week. Then went and changed tyres from 40,s to 45,s. And noticed I was now boosting at 15 psi dropping to 13. When before it was holding a solid 18 psi. I can't see any obvious leaks. Any ideas? Thanks.

[Rob_ioClean]

Will be a leaky hose, check all the little ones, sometimes you can hear a hiss.

[Flatout Phil]

Agree with the above. Not your tyres - unless your car is called Christine and has a borderline personality disorder...
http://www.youtube.com/watch?v=Sws88j_-JOE

That is unless it just has a sociopathic personality disorder:
http://www.youtube.com/watch?v=TFWea3Eu97E

Just make sure you don't make a truck mad:
http://www.youtube.com/watch?v=5MtAMc4i8OA

[stevie69]

last 2 are quality films.

[lurchio2]

Also when powering on in 4th and 5th it has started to have a intermitant miss. Would the plugs affect the boost.

[Volvostorm]

It never hurts to slip in a fresh set of plugs, they do breakdown over time.