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Old 02-08-2018, 03:56 PM   #26
Cobrakai
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Member#: 176408
Join Date: Apr 2008
Chapter/Region: SCIC
Location: South OC
Vehicle:
2005 EJ207 STy
White

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Quote:
Originally Posted by D-Rodman View Post
My v7 ej207 piston slaps at cold start but quiets down fairly quick, under a minute. Keep in mind when buying a used motor you are trusting the vendor is representing the mileage accurately. A higher miles motor will have more wear and looser tolerances.
Same, sometimes a bit longer in colder ambient temps.
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Old 02-15-2018, 10:13 AM   #27
Roland3
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Member#: 404510
Join Date: Oct 2014
Location: Western NY
Vehicle:
2005 wrx hatchback
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my 05 wrx has knocked on cold start for 200K miles, when its really cold out it is even worse. but pretty much goes away when warmed up.
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Old 02-15-2018, 10:25 AM   #28
Titter
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Join Date: Mar 2015
Chapter/Region: International
Location: Ontario, Canada
Vehicle:
2002 WRX Wagon
EJ207 Spec C 4EAT

Default EJ207 Cold knock or piston slap?

sounds like rod knock.

yes a slight rod knock can go away once oil is up to temp.

thats definitely NOT piston slap. piston slap is very rhythmic and goes away when throttle is applied and oil pressure builds.

i hope its a tensioner but really sounds like rod knock. perhaps one of your new ones was faulty or improperly installed.
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Old 02-15-2018, 10:58 PM   #29
2slofouru
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My BOV goes
COVFEFE!

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Quote:
Originally Posted by AspirinWhite View Post
Is the bad tensioner noise temperature dependant though? The noise I'm hearing disappears once it's warm and appears only when lower rpm from cold start.

The tensioner noise sounds like it's constant


There is a similar issue with the honda V6 motors, as the tensioner ages it loses pressure and gets softer. When they are about done, they will rattle so hard you think it's a rod bearing. They first become obvious on really cold mornings and the noise goes away as it warms up because the heat of the engine raises the tensioner's internal pressure and helps it stop rattling. As it gets worse, the rattle stays longer every drive, until eventually it doesn't matter if the engine is warmed up.

I haven't watched your vids yet, because I'm too much of a wimp to check anything other than youtube hosted videos
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Old 02-16-2018, 12:02 PM   #30
Samurai Jack
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Quote:
Originally Posted by 2slofouru View Post
There is a similar issue with the honda V6 motors, as the tensioner ages it loses pressure and gets softer. When they are about done, they will rattle so hard you think it's a rod bearing. They first become obvious on really cold mornings and the noise goes away as it warms up because the heat of the engine raises the tensioner's internal pressure and helps it stop rattling. As it gets worse, the rattle stays longer every drive, until eventually it doesn't matter if the engine is warmed up.
This has shown to be the case multiple times with Subarus. There are posts here discussing that as well as YouTube hosted videos of the noises with thread followups confirming that the tensioner was bad.

Last edited by Samurai Jack; 03-06-2018 at 10:09 AM.
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Old 03-05-2018, 01:32 AM   #31
tayl0rr
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Default Mine sounds very similar after rebuild

I just rebuilt an ej251 in an 03 outback and it has a similar noise. Noise doesn't seem to go away after it warms up though. Worse on the number 2,4 cylinder side. Hasn't gotten any worse after 100 miles on the engine but I would like to figure out what it is since I did the rebuild. Any ideas?

This one is cold

This one is after it has warmed up. Started running rough toward the end because the battery died. Doesn't like to run without the alternator when the battery hits around 10 volts.

Everything went to the machine shop. Machinist said the crank was still spec. Bored 20 over. Put a topline kit in it with pistons and oil pump. Plastigauged the rods and they were near the upper limits but not out of spec. Couldn't plastiguage the mains. I adjusted the valves again at 100 miles on the 2,4 side. They were out so I snugged them up. The valve noise went away but I'm still left with that other noise. I thought maybe it was what people are calling piston slap but the pistons and rings are new and the noise doesn't get any better after warm. I think its loudest around the number 4 and very loud if I listen on the EGR tube with a stethoscope. Could this be something to do with the EGR system? Wrist pin? Rod knock? I'm pretty sure its not a main because I can't hear it with the stethoscope on the passenger side. I had the timing cover off to check it and saw that my Gates timing kit had a bearing that threw grease everywhere so I replaced it with all factory timing parts, but this wasn't part of the noise issue.
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Old 08-06-2018, 11:29 PM   #32
AspirinWhite
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6 month update:

I've replaced timing belt, tensioner, all the idlers and the sound is still there. I also took another step further by replacing the possibily rusted exhaust manifold and the uppipe with a near new factory system and still did not fix the problem.

Then car went through about 7k miles including a track session in a hot day as well as some spirited canyon run... the engine is still running strong.

I also took a sample of a 5k mile old oil to Blackstones Lab and oil analysis came up good.

I'll continue to update this thread if anything comes up but looks like the engine is good for now.
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Old 01-12-2021, 02:21 AM   #33
AspirinWhite
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Its been awhile but doing another update since the swap. The car has seen more track days and also many long road trips from California to Oklahoma and also to North Carolina and back. The noise is still definitely there, and its more audible in colder mornings in the winter. However
it still goes away when warm and the car has been running like a champ still.

I will be swapping my 20yr old VF30 for VF48 soon and planning on doing another tune afterwards. I do realize the engine is over 20 years old as well so there's always a rainy day fund in case.
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Old 01-12-2021, 02:41 PM   #34
subaru_gc8
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Quote:
Originally Posted by AspirinWhite View Post
Its been awhile but doing another update since the swap. The car has seen more track days and also many long road trips from California to Oklahoma and also to North Carolina and back. The noise is still definitely there, and its more audible in colder mornings in the winter. However
it still goes away when warm and the car has been running like a champ still.

I will be swapping my 20yr old VF30 for VF48 soon and planning on doing another tune afterwards. I do realize the engine is over 20 years old as well so there's always a rainy day fund in case.
why not go with a 18g or so? yeah rainy day funds... mine has grown to 5000ish lol
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Old 01-12-2021, 02:43 PM   #35
AspirinWhite
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Quote:
Originally Posted by subaru_gc8 View Post
why not go with a 18g or so? yeah rainy day funds... mine has grown to 5000ish lol
I guess I'm pretty happy with the car being in the 300hp range. Even at tracks I go to, power was never really my concern. Also I was able to grab this vf48 at a good price so..
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