Time for the 4th of July PHAD Special!
This 2014 Subaru Forester came in with a misfire complaint at 120k miles.
Parts cannon has been unloaded, including the classic spark plugs, ignition coil, and fuel injector.
You guessed it, it’s STILL BROKEN!
Let’s gather some data and see what the root cause really is.
Unfortunately it’s BAD NEWS for the customer…
PHAD PRESSURE TRANSDUCER:
http://www.pinehollowdiagnostics.com/new-phad-pressure-transducer.html
TESLONG NTS 500 DUAL CAMERA ENDOSCOPE:
https://www.amazon.com/dp/B07SQ4FLYX?tag=onamzpineholl-20&linkCode=ssc&creativeASIN=B07SQ4FLYX&asc_item-id=amzn1.ideas.BH34H8T28VY4
IVAN’S PICOSCOPE WAVEFORMS:
https://drive.google.com/drive/folders/1SFSmWf6x9KiX6HzZL9__UPUX35k5o3EJ?usp=sharing
THINK TOOL PROS:
https://www.amazon.com/dp/B08XXWHQVJ?ref=exp_pinehollowautodiagnostics_dp_vv_d
Enjoy, and HAPPY INDEPENDENCE DAY!
Ivan
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Ivan: "I don't have the time"
Cust: "I'll pay you twice what it costs."
Ivan: "I'll get started in the morning."
Of course you're going to avoid the manual labor part. Scared to get your hands dirty?
Going to be interesting and educational to watch. Your determination always amazing!
11:19 You KNEW that was coming.
Customer knows best on his repair…lol. Wondering tho? Why did you pick pressure in cylinder test and not go straight to the bore scope, other than for our educational purposes, which indicates problem found with a great pic on butt crack exhaust valve. Great diag Ivan, thx for sharing.
14 h then You can do it in 4 h. Subaru is going down in popularity, no doubt..
I tore down one of these FB engines to do piston rings last year (surprise, surprise). I found that all 8 exhaust valves and all 8 seats were pitted pretty bad. I don't know how often they get as bad as this one, but it seemed to be on its way. Hopefully it really is just one valve on one head and there are no surprises in part 2 for either Ivan or the customer. Oh, and the FB I did only had 60k miles on it.
Would you be interested in a SAAB 9000 puzzle? Thanks for the video.
From your work i learned …stay away from nissan subru from asian brands and europeans forget about them you made life easier for many daily users.cheers
I'm surprised the customer talked you into it…..he/she must've been willing to open up their wallet pretty far lol
I have 280k on my 2011 outback premium cvt so far so good.
Awesome waveform and a great snapshot of the valve at fault! Sometimes it might be good for you to take a break from the brain busting diags and do some meticulous engine repairs haha! Also so weird how a few days after your call I’m doing an engine on a 2015 Cherokee with a burnt exhaust valve. Auto repair comes in pairs and anyone who works in the repair shop will say the same!
That's a very easy engine to remove/install and the head is pretty straight forward to
R n R .
I've seen a handful of these with broken valve springs. Be prepared for a fight getting the timing cover off and for hours of cleaning Fujibond. Make sure you have all fasteners out and don't pry on the timing cover past the cylinder block. You will break the aluminium cam caps otherwise.
I wonder if a chunk of carbon broke off from somewhere (EGR valve, piston top?) and got caught in there, leading to that damage?
Cool diagnosis.
NOOOOO! You are too nice Ivan!! That's a big job. Can't wait for part two! lol
At 120kmi, that's horrible. Thanks Ivan!
Are you ok? You look tired.
I can remember in the days of leaded petrol (1970's to 1980's), when Subaru made front wheel drive cars, and introduced the idea of 4-wheel drive in an ordinary car, and were very popular for towing small boats and were very efficient on the boat ramp. As well, gearboxes were very strong. They all used the 'boxer' engine, and over a period of time (past the 100,000 mile mark) exhaust valves would 'crack' and/or burn out with bromine fuel 'scavengers' in the petrol. This also happened with the air-cooled Volkswagen beetle rear mounted engines, which were easily removed for working on. With the later versions using fuel injection, and unleaded petrol, the seal in the injector tube would 'crack', causing a lean mixture to that cylinder, but very difficult to notice until an exhaust valve has burned out….
I can tell you what's not misfiring: my fleet of rust free Florida Panthers that sit in storage most of the year except for the rare occasion I drive one, like this weekend. Driving the one in my thumbnail right now!
…feel the love.
Why would someone design the engine so you have to take it out to do work to the head that's mad