Showtime

Scooby's def got a problem, just misfires until it warms up..is this damn 97Ron fuel likely to be causing this ?? or can damp get in anywhere. it's so compact under there that it's hard to see anything.

Anyone changed there own plug's or is it a job for the dealers, presume you have to crawl underneath to get at them. anyone know cost of them ?

Gloom gloom

pwebb

concentrate your detective work on plugs and coilpacks - my vote would be that plugs are the problem... is it an older wrx?

Paul W

pat

If it's an older car then my gut feeling would be coil packs... they seem to give up with some regularity. While the packs are out you might as well just pop a new set of plugs in anyway, to be sure.

Cheers,

Pat.

Showtime

Thanks for the input guys, no idea what the coilpacks are(or where).
Cars a MY96 STi (only 16K on the clock though, plugs should be OK as car was serviced in japan (at 22,000 kms)before I got it, any idea how long a job to change the plugs myself, daft thing is, on dry days it's fine !!

Bob Rawle

In order to change the plugs you will find that you have to undo a bolt and remove a potted (with resin) plastic cased object from off of the top of each spark plug, that is a coil pack. One to each cylinder and £47 plus vat each. They tend to get tired (whatever the mileage) with age and then just don't produce enough energy to spark correctly under load. Try closing up the plug gaps to 0.6 mm and see if that improves it.

Bob

Showtime

Thanks Bob,

what's the easiest way to remove them, over the top or underneath ?

Bob Rawle

Can only be done from the top. Best to take out the washer container on near side (can be balanced on engine without water loss) and air box or filter on off side to help access. Also best if you use a socket extension which "floats" a bit as the alignement to the plugs is a bit tricky.

Bob