![]() I think the outer valve cover seal might be leaking a tiny bit on the driver side too, but I don't think that would cause exhaust smoke?Ĥ. Any tips for replacing valve stem seals on the 4.7 L? I know that on a lot of engines you can do the rope trick and avoid removing the heads, but I didn't know if that worked well on this engine.ģ. Could it still be something to do with the PCV valve or something?Ģ. Seems like a lot of people talk about startup smoke but it usually ends up being other stuff, in a lot of cases. Can anyone think of any other possibilities? I feel like I've hardly seen anyone that has actually had valve stem seal issues on this engine, so I'd hate to replace the valve stem seals and find out it was something else. I added some Lucas Oil Stop Leak just for kicks, figured maybe it'd buy me some time, but I know that can take a couple hundred miles to do anything, and I just added it recently.ġ. The other day I noticed that it smoked after a long downhill with some engine braking, which I thought might confirms this (the vacuum on the downhill engine braking pulls in oil). My suspicion at this point is that it is the valve stem seals that have gone bad, leaking oil into the cylinders after the engine stops, which burns off the next time it is started up. I haven't driven it that much, but I never really notice the oil levels drop either - it's not like it's burning a lot of oil, as far as I can tell. Doesn't lose brake fluid either, or coolant. Other than the smoke, the truck runs awesome, and there isn't a check engine light - the power steering fluid levels don't drop either (I know sometimes the power steering valve goes bad and that gets burned and misinterpreted as burning oil). I've confirmed the engine oil level too, it's not too high. I also did the spark plugs just for kicks - none of them looked terrible, but almost all of them had a small amount of oil on the upper threads, which seemed to suggest valve stem seals. I put new O2 sensors and a new mass air flow sensor on it (which took care of the check engine light), and did the PCV valve, and power steering valve as well, since I was hoping that those might fix the smoke. Ever since I got it there has been a bit of smoke after cold startup. I bought it cheap, figuring I'd have to put some money into fixing it up, but hoping to generally do most of the work myself. I bought a 2002 Tundra with the 4.7 L V8 a couple months ago, with 230k miles on it. In most cases, valve seals are not very expensive. Really appreciate any advice people may have for me. Taking to a Mechanic Any task requiring the dismantling of your engine block should be handled by a mechanic. ![]()
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