Hi all, bit of an open question but here goes.

2005 wrx 300 (with prodrive) 21k miles. Had the cambelt done last year as soon as i bought the car at 16k miles and had a service. Car has run fabulous for the last 5k miles/12months. Quick and very responsive on the throttle, almost like a new car. I was very happy!

Went to my regular and trusted independent garage in edinburgh for a standard service. Got the car back and straight away it didnt feel right. Just a lack of sharpness and immediate response on the throttle. Like a car that is twice the age. Totally lost for ideas, so what have i done.

Been back to the garage, oil level is fine, diagnostics are ok, filters were decent quality, spark plugs checked and ok, filled up the 97 ron been for a good burn. Top end performane is pretty good and the problem less noticable.

Help!

 

Check pipes for a leak, what exactly was carried out in the service?

 

Oil change, fuel and airfilter and regular checks.

 

you using the same brand of oil which was in the scoob before the service was carried out mate ? as that's only thing i could think of

 

Dont know to be honest, it will be decent quality oil though. I was thinking of changing air filter then disconnecting the battery (for ecu purposes) just in case?

 

Was plugs changed?

 

and were they gapped????? doubt its the oil, oil doesnt make your car less responsive but plug gap would

 

Perhaps they disturbed the MAF & now it's not performing as it should.

 

Check the air box is seated correctly.

 

Yep check this^^aswell.
And if plugs were changed, maybe wrong ones

 

could be a freak coincidence but the NPS may have failed?

 

What if you switched from 5W-30 to 10W-60?

Overtight handbrake?