Welcome to the North American Subaru Impreza Owners Club Friday December 19, 2014
Home Forums WikiNASIOC Products Store Modifications Upgrade Garage
NASIOC
Here you can view your subscribed threads, work with private messages and edit your profile and preferences Home Registration is free! Visit the NASIOC Store NASIOC Rules Search Find other members Frequently Asked Questions Calendar Archive NASIOC Upgrade Garage Logout
Go Back   NASIOC > NASIOC Technical > Normally Aspirated Powertrain

Welcome to NASIOC - The world's largest online community for Subaru enthusiasts!
Welcome to the NASIOC.com Subaru forum.

You are currently viewing our forum as a guest, which gives you limited access to view most discussions and access our other features. By joining our community, free of charge, you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is free, fast and simple, so please join our community today!

If you have any problems with the registration process or your account login, please contact us.
* Registered users of the site do not see these ads.
Reply
 
Thread Tools Display Modes
Old 01-25-2008, 01:00 AM   #1
Buck Rogers
Scooby Newbie
 
Member#: 139234
Join Date: Jan 2007
Chapter/Region: NESIC
Location: Vassalboro, ME
Vehicle:
05NA Lifted Baja MT
Brilliant Silver

Default Piston Slap with 2.5's...how many have it?

I know this subject has been mentioned, because I have done some searching, but I'd like to see just how common this is. Specifically, how many miles when it was noticed, how long it lasts (10 to 15 minutes is common), and what was done about it. Or if you just live with it.

I believe it is more common on N/A engines, correct me if I'm wrong.

In my case (05 Baja 5 speed) it started at about 10000 miles, and when the temps dropped to around 10 to -10 it was almost constant unless I drove for an hour or so. After a complaint at the dealership, and an e-mail directly to Subaru of America, I left my car overnight at the dealership for a mechanic to listen to cold. Subaru replaced two pistons (drivers side) and all four sets of rings at 24000 miles. At about 32000 miles it slowly started to come back, now at 48000 miles and recent temps of -6 to 35 above it is almost as bad. I have installed a block heater which does help slightly, but it is still very noticeable for the first 15 to 30 minutes of driving. When the temp is 0 or below, it takes at least 30 minutes or more to really quiet down, but it can still be heard when idling.

So, anyone else with the slap ?

Buck
* Registered users of the site do not see these ads.
Buck Rogers is offline   Reply With Quote
Old 01-25-2008, 01:26 AM   #2
Kostamojen
Scooby Guru
 
Member#: 2272
Join Date: Sep 2000
Chapter/Region: BAIC
Location: haha XD
Vehicle:
2013 Subaru 599 :P
Galaxy Blue Sexy

Default

Are you saying its a constant slap, not an occasional knock?
Kostamojen is offline   Reply With Quote
Old 01-25-2008, 01:37 AM   #3
PROWL
Scooby Newbie
 
Member#: 162353
Join Date: Oct 2007
Chapter/Region: E. Canada
Location: Toronto, Ontario
Vehicle:
'04 WRX Wagon
PSM

Default

Yeah I've got piston slap too, especially at colder temps like yourself.
From what I've read it's pretty widespread, and with the engine configuration being flat doesn't help in the matter.
PROWL is offline   Reply With Quote
Old 01-25-2008, 01:58 AM   #4
Skateboardpro
Scooby Newbie
 
Member#: 45346
Join Date: Oct 2003
Vehicle:
1993 Impreza L
Satin Black

Default

at least 10-15minutes of driving from a cold start will make it go away.. I just take it easy when it's warming up
Skateboardpro is offline   Reply With Quote
Old 01-25-2008, 09:25 AM   #5
ScottyB
Scooby Newbie
 
Member#: 155883
Join Date: Aug 2007
Location: Augusta GA
Vehicle:
2005 Impreza 2.5RS
bacon rage

Default

i have it when it goes below freezing. if i can keep the revs below 2500 and light throttle i can't hear it. as soon as i use heavy throttle or go above 2500 i can hear it up past 3500 or so. as a rule i never romp on the car when cold so i don't have trouble keeping the car from slapping.

it only takes about 10 minutes to go away and my car still makes great power and uses no oil so i'm not too concerned. if it got significantly worse i'd take it to the dealer.
ScottyB is offline   Reply With Quote
Old 01-25-2008, 01:29 PM   #6
imprexaRS03
Scooby Specialist
 
Member#: 145883
Join Date: Apr 2007
Chapter/Region: SCIC
Location: Southern California
Vehicle:
2008 wrx
psm

Default

i know the flat 4 makes some strange noices when its cold.including a lil knocking ,especially when i start up my car
imprexaRS03 is offline   Reply With Quote
Old 01-25-2008, 02:50 PM   #7
Buck Rogers
Scooby Newbie
 
Member#: 139234
Join Date: Jan 2007
Chapter/Region: NESIC
Location: Vassalboro, ME
Vehicle:
05NA Lifted Baja MT
Brilliant Silver

Default

Quote:
Originally Posted by Kostamojen View Post
Are you saying its a constant slap, not an occasional knock?
It is constant when the car is first started and lasts until the car has been driven for about an hour (not noticeable above 3000 rpms) after an hour of driving it is normal sounding unless the car is idling, then it is a very low knocking noise. I don't think it does any real damage, as the car has plenty of power and doesn't use any oil. In the summer the noise goes away in about 10 to 15 minutes. The purpose of this post is to see how common it is and what, if anything was done to quiet it down.
Buck Rogers is offline   Reply With Quote
Old 01-25-2008, 03:16 PM   #8
03wrx05rscouple
Scooby Newbie
 
Member#: 154106
Join Date: Jul 2007
Chapter/Region: Tri-State
Location: binghamton NY
Vehicle:
yes 03wrx, 05rs
psm wrx, cgm rs

Default

i too have the same problem both in my 03 wrx and the 05 rs and my friends that have subies all have that same problem so i have never stressed over it.
03wrx05rscouple is offline   Reply With Quote
Old 01-25-2008, 08:18 PM   #9
GrundleJuice
NASIOC Supporter
 
Member#: 165749
Join Date: Dec 2007
Chapter/Region: South East
Location: stupid Florida
Vehicle:
2007 No YELLING
on the bus!

Default

i have an 07 with 8K miles, and its in a warm/humid climate (central Florida) i have heard nothing at all yet. had about a week of cold days/nights (45F day/30F night) and it seemed the same as ever. I may not have enough miles to be at risk, so maybe im no help at all!
GrundleJuice is online now   Reply With Quote
Old 01-25-2008, 09:09 PM   #10
cmiovino
Scooby Guru
 
Member#: 134005
Join Date: Dec 2006
Chapter/Region: MAIC
Location: Pittsburgh, PA
Vehicle:
2004 WRX Premium
PSM

Default

I can here my 2.2 do it... happens in the morning, first time driving for the day. After warming up, it goes away mostly. It's still very faint though even when warm. On my rip home, it always goes away and stays away. This is near zero degree temps. In the summer and fall, I don't really hear it all.
cmiovino is offline   Reply With Quote
Old 01-25-2008, 09:25 PM   #11
surowrxa
Scooby Specialist
 
Member#: 102895
Join Date: Dec 2005
Chapter/Region: MAIC
Location: Pittsburgh
Vehicle:
'12 Forester
'08 Legacy

Default

Quote:
Originally Posted by Buck Rogers View Post
It is constant when the car is first started and lasts until the car has been driven for about an hour (not noticeable above 3000 rpms) after an hour of driving it is normal sounding unless the car is idling, then it is a very low knocking noise. I don't think it does any real damage, as the car has plenty of power and doesn't use any oil. In the summer the noise goes away in about 10 to 15 minutes. The purpose of this post is to see how common it is and what, if anything was done to quiet it down.
Our '99 Forester had it light at 60K, slowly lasting longer after warm-up until now (112K) it can be heard lightly at all times, more under load. Of course now in the cold it sounds catastrophic at start-up, but subdues to normal after full warm-up. Power is unchanged (not much, it's auto) and it does not burn oil. We would love to replace it with a 2009 Forester. It has otherwise been a very sturdy car.
surowrxa is offline   Reply With Quote
Old 01-25-2008, 09:57 PM   #12
bullworm562
Scooby Newbie
 
Member#: 166091
Join Date: Dec 2007
Chapter/Region: NESIC
Location: Southington, Connecticut
Vehicle:
1998 Outback Limited
Green

Default

what exactly does piston slap sound like? because i prolly have it too but i dont know what to listen for.
bullworm562 is offline   Reply With Quote
Old 01-25-2008, 10:56 PM   #13
Buck Rogers
Scooby Newbie
 
Member#: 139234
Join Date: Jan 2007
Chapter/Region: NESIC
Location: Vassalboro, ME
Vehicle:
05NA Lifted Baja MT
Brilliant Silver

Default

Quote:
Originally Posted by bullworm562 View Post
what exactly does piston slap sound like? because i prolly have it too but i dont know what to listen for.
From inside the car, on the drivers side, a metallic clack/knocking sound, very noticeable when starting the vehicle after a cold night. As the engine revs increase it will not be as loud, and as the engine warms and the pistons expand (10 to 20 minutes) it fades to a light knock only heard from inside the car.

Other than the noise the Suby has been one of the best cars I have owned
Buck Rogers is offline   Reply With Quote
Old 01-26-2008, 04:16 AM   #14
kimoman
Scooby Newbie
 
Member#: 97476
Join Date: Oct 2005
Chapter/Region: Tri-State
Location: NY
Vehicle:
2006 Impreza 2.5i
Aspen white

Default

I have it on my 04 wrx. Started at around 35k car currently has 58k. No loss in power. Goes away after 10 min. On my 06 2.5i nothing yet about 17k mi.
kimoman is offline   Reply With Quote
Old 01-26-2008, 07:26 AM   #15
wanbol
Scooby Newbie
 
Member#: 167353
Join Date: Dec 2007
Location: UAE
Vehicle:
2004 Legacy (BL9)
Silver

Default

Does anyone have a sound clip to be more specific? I might have it on my 2.5 too...
wanbol is offline   Reply With Quote
Old 01-26-2008, 05:12 PM   #16
nardvark
Scooby Newbie
 
Member#: 145108
Join Date: Apr 2007
Vehicle:
2002 Impreza TS
Aspen White

Default

I have a minor case of this (I think). When it's started for the first time for the day, it takes maybe ~5 minutes for this to go away. For me it's more of a heavy vibration than a metallic sound. To be honest, the plastic on the door resonating and buzzing makes more noise than the engine itself. It is most noticeable at idle, and by the time I get out of my neighborhood and past a stoplight or two, it's gone until the engine is cold again.

Can't tell you an exact mileage of when it started, because I got it used with about 70k on it.
nardvark is offline   Reply With Quote
Old 01-26-2008, 05:30 PM   #17
lamaale
Scooby Newbie
 
Member#: 143718
Join Date: Mar 2007
Chapter/Region: E. Canada
Location: Montreal Qc, Canada
Vehicle:
2005 WRXwagon
Silver

Default

Got it too, my subi dealer replaced the piston number 2 and 4 as well as the rings under warranty...
lamaale is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
CP Pistons clatter/slap. How many have it? kakarotoni Built Motor Discussion 29 03-25-2010 02:33 PM
how many have build race cars? how long did it take? spazegun2213 Motorsports 46 09-13-2006 10:12 AM
Those with GT35 kits: how many have coated or wrapped piping syoung0298 Factory 2.5L Turbo Powertrain (EJ Series Factory 2.5L Turbo) 8 07-24-2005 01:26 PM
How many People run with cats and how many have 0 cats? waitandbleed92 Factory 2.0L Turbo Powertrain (EJ Series Factory 2.0L Turbo) 29 04-04-2004 08:03 PM
cobb stage 2 owners, how many have lost boost with headers? wrxracer55 Factory 2.0L Turbo Powertrain (EJ Series Factory 2.0L Turbo) 6 03-08-2004 04:29 AM


All times are GMT -4. The time now is 08:23 AM.


Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Powered by Searchlight © 2014 Axivo Inc.
Copyright ©1999 - 2014, North American Subaru Impreza Owners Club, Inc.