180,000 Mile STi Compression and Cylinder Leakage Test Results!
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- เผยแพร่เมื่อ 15 ต.ค. 2024
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Just did a leakdown/compression test on my 240k ej255, and wanted to get your opinion.
Cyc 1: 129psi, 6%
Cyc 2: 121psi, 7%
Cyc 3: 126psi, 11%
Cyc 4: 125psi, 8%
All of these test where on a cold motor.
Certainly looks heck of a lot better on that engine bay. Glad the ignition issue was just the sparkplugs. Not worth saving money by buying cheaper engine components, you definitely get what you pay for..
Any true Subaru owner will know never ever put aftermarket spark plugs or coils on a WRX STI seeing that hurts ahh so bad just imagine what else he neglected
@@michaellnss there should be a manual for the unwritten rules
#4 is so infamous in the turbo Subaru world.
i have a 2010 WRX with 203,000 miles, and its still running strong.
Mods?
cold air intake. I sold it. 3rd gear was grinding
Your phone did a great job man. No worries. Really enjoy your videos brother. Thanks for sharing!!!
Literally learn more from this guy about Subarus then anyone else
Please do a video on cleaning an STI engine bay. You get everything looking mint and I want to see exactly how you go about it
Judging by the spark plug neglect everything else would be neglected including oil which may allow sticky piston rings which will give the same result - tried anything to see if you can raise that compression?
Great video and great advice. This car could definitely use a bit more love and affection.
I love your content, I learn a lot while at the same time getting great ideas!
Great video as always bud
That is excellent service life from a Turbo charged engine!! I hope my wife's WRX holds up similarly. I wondered how well these little Boxers would do with forced induction, impressive.
I've seen 200-300k mile WRX and STis before. All about how you maintain them.
@@MrSubaru1387 , I totally agree. I still do 3K oil & filter changes & always will. Those chains and sliders love clean oil!!
My 2006 WRX has 313k on odometer.
Original everything.
I'd love to do these tests on my engine.
Impressive for a subaru engine but nothing special for a turbo engine
You sure cleaned it up nice even the battery terminal!!
That thing could probably run a while longer surprisingly.
Great if you like replacing rod bearings lol
@@dreww47 thats what i was thinkin
Great video, learned so much from it, thank you! Why did you decide to do the compression test if the leakdown test gives the same info plus where exactly is the problem?
Short block replacement ? Huh!?
Just keep driving it haha, 5psi difference is not significant enough to affect drivability in normal conditions.
Sounds like she has some life left in her.
Absolutely agree. Even 10 psi difference isn't considered and issue.
I won’t even run auto lights in my lawn mower !
What made you want to do this check? Runnability issue or just a maintenance check?
Wow, what did you use to clean the engine bay? Any chance we can get a video of your steps?
Kwonster321 degreaser is the best method
What tool did you use for the compression test, that allowed you to stay upfront with the motor and not in the car to crank it over?
Is this a compression tester that does not require you to crank the engine? How does this work? Have never seen this. Thanks.
Short block replacement or rebuild? New piston rings, valves and a good cleaning of the heads should be more than enough to fix those small leaks no?
Nobody rebuilds Subaru short blocks. Its cheap to just replace with new from Subaru. Last I checked and it was 4 years ago they were going for around 2k USD. Heads could use a rebuild with this many miles thoguh
I noticed when you did the leak down test you didn’t do TOP DEAD CENTER is that necessary?
Great video breakdown, I learned a lot having recently picked up a 2011 ST/w 140k miles.
Quick question. What your thoughts on these leakdown numbers
Cylinder 1-2 10% (90)
Cylinder 3 15% (85)
Cylinder 4 10% (90)
Compression was a solid 145 psi across all cylinders.
Do you see anything wrong with these #'s, specifically cylinder 3?
All 4 are within 10% of each other. Standard deviation. Should be fine.
@@MrSubaru1387
Perfect! That's what I thought but wanted to be sure. I think I may get a valve job done, or upgrade the entire head for more longevity and reliability and of course a slight HP increase with the IAG head.
Thanks for the reply I really appreciate it big guy!
Please do a rebuild video if the owner wants to go ahead with the repairs.
I rebuilt this same engine but from an 06 sti, it had broken ringlands on both driverside pistons, bad headgaskets, blown turbo, ate coolant and oil(obviously), broken hoses everywhere. It was in really bad shape.
I like how easily accessible transmission bolts are
Subaru are very easy to work on.
@@MrSubaru1387 I did not realize Subarus were easy to work on. I live where Subarus are uncommon(Florida), so I never got the chance to get familiar with the location of things under the hood.
Did this car have a P030x code? P0304 with a slightly rough idle just came up on my '06 STi with 132k. Swapped coils and plugs with #2, one at a time, hoping the fault would move. No dice. I need to do a leak down. I'm suspecting a head gasket.
great videos but Im stuck. How do I disable ignition and fuel On H6 outback to perform compression test
Great video buddy 👍
Thanks. 👍🏻
I have an 05 sti with 168k and it's losing compression. #1 and #2 are low. 90 and 95
Is really replacing the block the way to go? Aren't new piston rings and a refinish of the cylinder walls an easier and still really good way to go about it? (Of course if you're taking the engine apart it's wort putting some fresh rod bearings and gaskets and seals)
My cylinder #4 has the highest lol. I have an 02 wrx with 200k miles and I have 140-150 psi all the way across.
How long have you owned it? What oil and oil service interval?
MrSubaru1387 , I gotta say I do enjoy your channel and all the content, it's been amazingly helpful and you seem to know your stuff! Question: I have an almost exact setup, only on a 2005 Legacy Gt limited 192,000 miles (Its been good to me) Recently I've been trying to figure out the causes for a # 2 and a #3 cylinder misfire. This all happened about a week after I replaced the upstream O2 sensor that had been put off for longer than it really should have been. I've replaced the coil and Plug on #2, and it did seem to smooth out the idle significantly, yet I still show a misfire on the same two cylinders, I expected #3 to show for sure, but not #2. I literally could hear spark on the # 2 cylinder when I pulled the coil (while running) to see if it slowed the engine. It did not slow the engine when I pulled either the coil electrical connectors or the injector wire plugs on either 2 or 3 only on cylinders 1 and 4 did this make a difference. What could be going on here...Dirty injectors? valves? Any help would be greatly appreciated! Keep up the awesome videos and take care-
Start with a compression /cylinder leakage test
Po302 2006 Subaru sti with 150,000 miles. Car runs fine. Short and long trim within specs. Leakdown test is next. Swapped plugs and ignition coils. Haven't done injectors yet
Hey great info. Did you do the test with the engine warm? Thanks
I usually test cold. You can test warm for increased numbers, but I like to test cold to get the lowest numbers possible.
Hi guys, this engine is EJ25?
It is worth buy WRX STI 2015 with 100 000 miles on clock ? Can engine with that mileage work lets say another 100 000 miles ?
My compression numbers are 110-100-100-100. It still runs fine 🙃
Dang, really? Got 110-115 on MY07 OBXT and have a misfire at low RPMs on Cylinder 1. Cannot figure out the issue for the life of me. 😫
How do you make sure you're not getting any residual fuel pressure after disconnecting the fuel pump
127 is way low for an STI. That may be acceptable for a NA engine... but STI’s should be at 150. I agree with your recommendation. With that much blowby.. he’s going to clog up the PCV. AOS man
With those compression/leakdown numbers do you think that motor would be fine for daily driving duties with the occasional spirited driving?
Yes. Probably good for another 50k+ miles.
@@MrSubaru1387 That's good to hear. Its nice to see a "healthy" EJ motor with that many miles.
Do you recommend changing spark plugs at about 35k miles? I've been knocking out some 30k milestone maintence like diff fluids, brake fluid, cabine filter etc. I don't track the car and its stock ,but do you think I should go ahead and change the plugs or wait til 60k?
Usually replacing head gaskets on EJ engines, are valve adjustments usually needed?
Typically any SOHC or DOHC engine without hydraulic lash adjusters or hydraulic cam buckets is in need of adjustment by the time the heads need to be removed.
So if #4 is alright do you think the rest would be?
All sparks out to do the test?
id like to see how you cleaned the engine bay and what you used to do so. I got 02 wrx im trying to "restore" lol
Did you skip the exhaust check since it was a small amount?
The engine would be just as worn as the drive line, suspension, bushing, rack etc, feels kind of pointless having a fresh engine and old everything else?
Who knows how many of those things were replaced over the life of the car? At 180,000 miles, I'm sure several suspension and driveline parts have been replaced, however, the age of those parts might vary. In addition, some of those parts may have been better than the kinds of parts found in a stock WRX STI.
Hey got a question i got a 2013 wrx burns oil after oil change in 1200k miles i add maybe 1 litre got no leaks changed the pcv and still does it 113k miles on it please kindly help
Stock
Sounds like rings are bad. Are you getting white smoke on start up? Or while aggressively revving?
J nielsen this summer a little bit like normal
Smoke and goes away cold start revs 2k warmed up 900. Now this winter normal smoke but won’t go away. Cold start 2k goes up and up is it normal? But warmed up 900
dang. did you recommend they put the stock intake back on?
Yes. And stock recirculation valve.
How do I disconnect the fuel pump on a 05 wrx to do a compression test so it doesn’t start
Great video thanks!
Subcribed because I have a 07 hawkeye sti
I have an 02 WRX with random cylinder misfire that I can't figure out. It has rough idle about 50% of the time; however, engine pulls good...
Compression looks good (didn't do leak down)
Coils tested (resistance)
New plugs.
Fuel pressure/regulator is good.
Also replaced the turbo inlet and leaking valve cover gaskets.
Double checked timing and that also looks good.
That oil valve thing under intercooler looks to be working.
Cleaned ground wires and etc..
I checked every hose for leaks replaced some that were brittle around turbo area.
Last thing I did was check resistance on injectors on passenger side which returned 12.9 and 12.6 - the other side was pain to remove the metal bracket so I gave up.
After that I did injector cleaning by hooking up a carb cleaner directly and run car for a few seconds on that only...
Any help/hints is appreciated. Thanks.
What did the spark plug out of #4 look like? I expected more ring blow-by out of #3 unless #4 plug looked even worse.
They were all pretty rough. 4 wasn't any worse than any other.
Mrsubaru
What engine has your wrx?
Nice!
Crap spark plugs aside, does this STI have any noticeable drivability issues indicating cylinder 4 problem?
Not really. Drove pretty well, even on the old plugs. Haven't taken it out since the new NGKs were installed.
Could the lower compression and leak down results on the left side be related to a bad head gasket? I noticed you checked for coolant bubbling on the right but not sure about the left.
I checked on all 4, just didn't film it. Leakage was by the piston rings. Just more worn than the other 3.
If the leakage is by the piston rings, does that mean that it will burn more oil than normally and owner should keep an eye on it? Although you should always keep a frequent eye on oil with subarus.. :))
@@andriusa.6444 Yes.
Greetings from chile 🇨🇱
Aren't motorcraft plugs made by autolite?
Doesn't matter. They don't work well in Japanese designed car ignition systems.
Does it have to be warm motor to do a compression test?
No.
Why is it a ways #4?!
Do I need to get each cylinder at top dead center? If so, how do I? Thanks!
For cylinder leakage test? Yes. Each cylinder to TDC on compression stroke, when testing it.
Can I do this without a starter button? For an 04 wrx
yeah if you have a friend
Do you have a video on cleaning Subaru engine bays?
No.
can you do like exhuast leak test eg uppipes etc
Probably be doing a boost leak check this week on the bugeye.
Maybe a cylinder four cooling modification in the meantime? Cylinder four is known to be more problematic and run hotter on Subarus. www.iagperformance.com/GDT-Cylinder-4-Chamber-Cooling-System-WRX-STI-p/gdt-1005.htm
forums.nasioc.com/forums/showpost.php?p=29743160&postcount=39
The 05 came with a timing chain? 😮
No. It's a belt.
Saving $100 by buying crap coil and bad Spark plugs to ruin your STi is not a good way to go about it. Personally The cold air intake and blow off valve would bother me but as long as your not beating on it it should be ok. The blow off valve is blocking The recirculating hose that goes from the valve to the inlet. Your throwing the air fuel off just don’t flat foot shift or power shift with the valve venting to atmosphere.
This isn't my car. I'm fully aware that the BOV and CAI are trash. I mentioned that and why they're a bad mod in the previous inspection video.
MrSubaru1387 didn’t mean you personally , I watch a lot of your videos and was speaking to everyone here . I messed my STi up by not getting the OEM outer tie rod and it was shorter ,threw the alignment off. Went and got OEM and never had an issue as I counted the turns it took to take the stock one off. I know sometimes we are in a rush to get the cars together and throw questionable parts on.
Get it to 200k then do a track day and explode it. 😄
only two things that's wrong with it, is blow of valve and cold ass shit intake. even if it's remapped, that piece of shit accessories is fucking up a sort of good engine.
Autolights WTF lol😱
Ikr...
I had a shop do a compression and leakdown test on my 05 STI.
110-120 PSI on all cylinders. 1% leakdown.
How? They said they did it with throttle wide open and warm. I don’t believe that. And 1% leakdown on a 20 year old motor when PSI is at 120? How did they mess up so much?