right cars had the problem since ive owned it. no idea whats causing it its only in the morning on start-up and (when cold) trakes a while for it to start. ive replaced the plugs and the coolent temperature sensor. i dont hace an enginge check light displaying. think it may be a coil pack. any other ideas its driving me nuts. anyone had the problem and curred it? its a 95 wrx

 

have you tried the cold start valve if thay have one most cars do hope this helps many thanks stephen

 

Did you check tappet clearances???

 

i dont know how to........ not very clued up im in kent on the off chance you may be to cold start valve????

 

When you do get her started does the engine idle high then drop down to normal idle when warm? If so the IACV is working. I think you'll find if it is not then the engine will run or try to but will be idling really low when cold may seem juddery.

To check tappet clearances you need to remove the rocker covers, find out the tappet clearances, get yourself sum feeler gauges and check the gaps when cold. If they are tight, to the point you cant get the gauges in between the cam and follower (tappet bucket) then the inlet and/or exhaust valves are being pushed open giving you no compression. The tappet shims need replacing to give you the correct gap.

 

think its the first one. and i dont think i would take the covers off ect for fear of doing something wrong i have seen this dont tho so may be an idea but would mean redoing the gaskets? and also how much would the new parts be??

 

Yer not an easy job to replace if needed!! I've not had to do it on a scooby (which looks a complete *** to do!) but on sum you can get a tool to get the tappet shim out. On others you have to remove the cam shaft which means removing cam belt, cam gears and cam carrier caps. Pricey if you cant do it yourself!! Cant imagine the shims would be expensive or you could get your original shims ground to the correct size at a machine shop.