View Full Version : lifter noise

05-13-2005, 10:40 AM
Anyone else with the EJ25 have a significant lifter noise coming from their subie? I just bought a 2002 Legacy GT and it has a quite loud knock when the engine is cold, it dramatically decreases after the engine is warm, but is still noticeable. I asked the dealer about it when I bought the car and said that all the EJ25's made this noise. Is this true? or were they just giving me a line of sh*t so that they wouldn't have to work on the car under warrenty? I have replaced the junk oil that the dealers put in with Mobil and added the STP oil treatment. Is this something that I should bring back to the dealer to fix while the engine is still under warrenty? Or wait it out and see if it goes away with the oil treatment?


05-13-2005, 11:50 AM
i harassed carmax so bad about my car making that noise... sounds like you have one dielsel cylinder right? i've got the service bulletin around here somewhere about it, so yes, technically, its normal.

05-13-2005, 11:58 AM
Yeah I have the same problem, but I think I have another valve cover gasket leak as well, I've been losing oil gradually for a couple months now, just put in a full quart the other day to bring it back to the full tick. I'm going to try some of the lucas treatment, see if that works, I heard that stuff is one of the best out there, and supposedly helps with lifter knock. I started hearing a very faint rod knock so I'm just praying my engine lasts until I have the funds to either fix it or replace it, lol.

05-13-2005, 06:53 PM
moa is also supposed to be extremely good for subarus in keeping the lifters and such happy....

05-13-2005, 11:37 PM
i put lucas in my car, didn't really do shit, and i think it sapped power from it. (don't ask, but the butt-dyno tells me so)... also, it hesitates in all kinds of wierd places.

don't do it man! say NO to lucas! i work at advance auto, and i hear so many people speak so highly of it, well i don't like it. i can't wait for my next oil change.

the crap is like melted cheese... its soooo stringy...

and it didn't help any sounds at all.

05-20-2005, 07:56 AM
I used STP oil treatment and the knock goes almost completly away once the engine is warm. But when it is cold the knock is quite loud. A friend said to try a lighter weight oil that will get to the top of the engine faster. I used 10W30 now, was told to try 5W30. Will try that on the next oil change.

05-20-2005, 08:54 AM
first, all ej25s suffer from cold-engine noise. thats just life. its not bad, its normal.

second, are you sure youre hearing lifter noise? or could it be piston slap, which all subarus suffer from. its not bad, its a by-product of having a horizontally opposed engine.

05-20-2005, 08:55 PM
Its all pretty much the same, I'll find the notice issued from subaru that addresses the noise, but your right, its from cold start-ups and having a flat 4, and it's normal - the STP treatment you added probably isn't helping it, it normally goes away when the engine heats up a bit. As far as the engine oil, I'm pretty sure the 2.5's call for 5W30 from the get go. Maybe that could be a problem too. Running a heavier engine oil can also reduce your gas mileage by a couple miles...which in terms of the wallet is pretty huge. Check your owners manual but IIRC most Legacy's call for 5W30. Definatly switch next oil change, get a decent filter (subaru, purolator, wix -- no fram, stp, or other autozone brands, they aren't valved correctly like the first 3 which isn't too good of a thing from what I've read). Let us know what happens, if nothing, at least summers coming so the weather won't be as large a factor (startup on a 20 degree morning and on a 60 degree morning are 2 different animals).

05-21-2005, 06:54 PM
I put the lucas stuff in my EJ22 when the piston knocking started sounding pretty heavy and it helped....I don't hear it anymore. I'd say yes to Lucas. As to the Fram oil filters, I've never had any problem in my engine with dry starts and the like. I usually use Syntech Synthetic oils, the thickness depending on the temperature outside. 0W-30/5W-30/10W-30 Still strong at over 170,000 miles....

06-07-2005, 08:20 PM
If you go to http://www.bobistheoilguy.com/ you will never want to use lucas oil products in your car. It makes the oil froth like mad.

I've heard marvelous mystery oil is a really good oil additive, you might try that.

06-07-2005, 08:24 PM
It worked well for me, and our mechanic uses it, he's an import specialist....

06-08-2005, 09:16 AM
Well the noise hasn't been getting any better and I stopped into the Subie Dealership and they said that they wanted to take a look at it since my drivetrain warrenty is still in effect. They said that it is making some serious noises that shouldn't be there. So I am getting a complete shortblock replacement compliments of SOA. :-D I go to drop it off on Mon. I am going to tell them if they don't want to wait for the parts they can use the engine out of the Silver STI they have in the showroom! :twisted: Doubt it will work, but gotta see what he says.


06-17-2005, 01:51 PM
are you sure youre hearing lifter noise? or could it be piston slap, which all subarus suffer from.

Indeed it was not a lifter knock, it was piston slap. One of the cylinders was 0.005" out of round. And my local Subaru dealership gave me a complete short-block replacement. Plus while they were working on mine, I got to tool around in a brand new Outback. And I must say that the sport-shift was quite fun to play with. :D

Anyway, there is no more knocking, and there is hardly any difference noise wise from when the engine is cold to when it is at temp.