Big end/piston slap ?
 

Havent driven car for a bout a week, started it this morning, cool, idling a bit rough,not idling rough i should say, more like, a slight change in tone/misfire.

anyhoo,after about 3-4 mins i could hear a slight knocking,it sounded a bit :eek: at 1st, not major, but disapears above 2k revs, i thought big ends got noisier the more revs.

it seems to sound like its knocking but its not when its cold,once warm, all cool,even the 8 hrs at work then starting it it doesnt happen,only in the morning really.

could this be piston slap ? MY95 wrx.

Oil pressure is cool etc,all fluids clean/refreshed often

any thoughts......

Sounds like Piston slap if it only occurs after it's left overnight.
What sort of mileage has the engine done Rig ?

Mileage converts to 70k Miles

When my big end went the noise (in the early stages) was only apparent when changing between accelerating & deselerating.

Where as piston slap was only when cold & nuteral low revs.

If you are experiencing the first of the two - get it checked out asap

Piston slap does just not appear after being stood all night, It can & Does appear after a few hours of standing especially if it's low to freezing conditions. It's more of a GRRrrrrr in a can noise with the odd Donk thrown in for good measure!!!:D
There is a sound file on here somewhere
Found it
http://homepage.ntlworld.com/alan.le...p%20(cold).mp3
It's more noticeable in this sound file about half way through :thumb:

Dean

any real way of telling this or is it a garage visit? only asking as i can haer something similar on my wrx its on 90k

Yup,mine is EXACTLY like that sound file, but maybe not so loud,so not exact LOL, but yep, cheers for that !!