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    Raising the (un)dead 4r70w transmission

    Greetings! I've been gone a long while, but thought I'd come back with an update on the truck from this thread: https://www.bobistheoilguy.com/forums/threads/4r70w-transmission-overheating-failed-cooler-bypass-valve.302831 Vehicle history is in first post of that thread, with the addition of a...
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    Oil leak (almost) disaster

    Started getting a strange, intermittent "burning smell" when at stoplights, but by the time I got to destination and opened hood, it would dissipate and I couldn't locate source. Didn't smell like smoking oil, and instead smelled almost like diesel exhaust. No obvious leaks besides the residue...
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    4R70W transmission overheating / failed cooler bypass valve?

    Vehicle history: 2005 F150 XLT 2WD with a 4.6 and 4R70W. 172k miles. Has both radiator end tank ATF cooler and small aux cooler piped in series. Boss bought it used with ~40k miles; original transmission gave up around 100k miles and got replaced with rebuilt unit. Truck had some other issues...
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    EVAP leak whack-a-mole

    Been hunting the cause of a persistent check engine light for a while. Finally got serious when the P0442 code for small evap system leak was joined by a P0455 large evap leak code that would appear within a day of getting cleared. Also noticed a whiff of fuel vapors from rear of car once in a...
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    Divert all power to the starters, Scotty!

    I've had relatively limited experience with different vehicles in this regard, so thought I'd reach out to you all. On my car, my mom's XC70, and my dad's old S40, all noncritical electrical items (lights, climate control, aux 12V sockets, etc) are shut down while the engine cranks. This makes...
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    Engines that are "picky" about oil

    I don't want to start a brand loyalty flame war here. I'm simply curious if you've had experience with any engines that stand out as liking one particular brand over another in terms of noise, smoothness, or consumption. My car doesn't seem to care in terms of smoothness and noise. PYB...
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    M1 HM 10w-30 / 4432 mi / 10 month / 98 V70 GLT

    Happily surprised by how well this turned out. Oil was quite dark when I drained and smelled a bit like fuel since the engine wasn't fully warmed up the last time I drove it before draining. Silicon is much lower than I expected given how many times I've had the intake tubing opened up during...
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    Pre-filling filters effect on first startup

    Spin-on filter in my car installs straight up, so I can fill it all the way before I screw it on. Only the galleries need to purge before oil pressure can build. Since I just installed an electronic oil pressure gauge that updates a few times per second, I decided to record what the pressure...
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    Oil pressure sender + "smarter" idiot light mod

    Finally got around to installing an electronic pressure sender. Little bit of an endeavor on this car that requires taking off the intake to access the front of the block. Also took the opportunity to inspect intake valves, as well as the PCV hoses and oil separator. See this thread for that...
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    Surprisingly clean intake valves at 187k miles

    I have the manifold off to install an oil pressure sender and to service/inspect the PCV system. Quite surprised to see how clean all the valves look. I expected at least some deposits or varnish. This car will get some PEA-based fuel system cleaner run through maybe once per year. I tried MMO...
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    04 XC70 / M1 10w-30 / 3k miles / 8 mo / high iron!

    My dad and I bought this car for my mom last year. It had an oil change receipt shortly before the dealer got it with bulk conventional 10w-30. Oil was clean golden and at proper level when we got it, but there was some sludge visible at the top end, and by the end of summer the oil had turned...
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    Graph of oil temp, ATF temp, and MAP

    Not entirely sure if this post fits here or in the ATF, Differential, Trans, Brakes, P/S forum, or somewhere else. I got my data logging program working and made a graph of all three sensors for a drive on surface streets and a drive on the highway. The temp sensors may need adjustments and...
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    Turbo repair: new bypass valve + wastegate adjust

    Been chasing some performance issues on my car now that I have a boost gauge. The whole point of the tiny turbo is to spool up quick and give a fat mesa of a torque curve from 2000 rpm up to 5000 rpm. But the car was a slug off the line, and even once the revs were up it felt weak. Gauge...
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    '14 XV Crosstrek / dealer 0w-20 / 4925 mi / 1yr

    This is for my dad's Subaru XV Crosstrek. He uses it for a short (~8 mile) commute, but it also sees longer highway trips every few weeks. He has the oil changed and all services done at the dealer for their records, though now that it's out of warranty that may change. Factory OCI is 7500 miles...
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    Sample for UOA early, or at oil change?

    Car in my sig has 4k miles and 8 months on current fill of M1 10w-30 HM and OEM Mann filter. Factory OCI is 5k miles, as the turbocharger automatically puts it in the severe service category (according to late 90s oil tech). The NA version of the same engine has 10k for normal service and 5k...
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    Exhaust stud oil leak repair attempt

    A few thousand miles ago, I began to get occasional whiffs of a "hot smell" in the cabin. At first I thought a raw exhaust leak, but it didn't happen with a cold engine. It somewhat smelled like burning rubber, but there weren't any rubber parts getting that hot either. The smell would go away...
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    Finally added oil temp and boost gauge

    I've had an Arduino embedded computer with an LCD screen that previously was just used for monitoring my ATF temps plus a few odds and ends. Just added an oil temperature sensor and a boost/vacuum sensor. Attaching a sensor to the side or bottom of the pan can give inaccurate readings...
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    04 XC70 UOA - fried FF at 86.5k miles

    Last spring my dad and I bought a new used car for my mom. We got a great deal on a 2004 XC70 with only 81k miles. I didn't see the Carfax, but my dad thought he remembered seeing something about a transmission service performed at around 60k miles. At the time we made the purchase, the ATF...
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    UOA Maxlife & Dex III | 98 V70 186k | 14.5k OCI

    Just got the analysis on my ATF from the car in my sig. Here's a quick history: Winter of 2016 at around 168k miles it got the first drain and fill it had seen in a while. Fluid was brown, stinky, and overdue. I didn't sample at the time...and I'd be somewhat afraid to see how bad it was...
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    Thermostat too cool / out of spec / wrong part?

    Car in my sig. Warms up plenty fast, but coolant temp seems to swing lower than it should when on the highway or with the AC fan running. Even on a hot day, my Scangauge reports coolant temps consistently around 82C / 180F when cruising, or if the AC fan is running. When AC fan isn't running in...
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