The Rig

iTrader: (13)

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 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......

merlin24

iTrader: (1)

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

The Rig

iTrader: (13)

Mileage converts to 70k Miles

BlkKnight

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

DeanF

iTrader: (1)

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!!!
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

Dean

stevie1982

iTrader: (16)

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

The Rig

iTrader: (13)

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