3rd gen Prius Check engine light saying piston 3 misfire Whenever it is cold, it will jerk the engine bay with the misfire, it sporadically comes on and off has been driven with this issue for 20k miles Will eat about a quart of oil per month you open the injector to clean it, and you see oil in that chamber Is this 100% a blown head gasket? Suspicion: head gasket is blown and oil is leaking into that chamber 242k mile, has overheated once and completely shut off due to failed water pump at about 170k miles the part you are fixing to order: Part number: 11115-37062 This part number only include the head gasket There is another kit for about $200 that has many extras, Should you get just head gasket for $58 or get the whole kit for $200? The job is scheduled for the next 1-3 weeks depending on timing since you are using the car daily go now look for the part number for that kit and see which way your fixing to go OEM Toyota 2010 - 2015 Prius Cylinder Head Gasket Set 04112-37254 Genuine NEW | eBay kit from Japan 210 dollar part number: 04112-37254 get just the gasket or the whole kit? The only part of the install you are concerned while watching YouTube clip: you have to take off the camshaft/timing chain/tensioner to do this task You saw how they mark their timing at 2 o clock, but you'll be documenting it for this thread once you do the task in couple week Goal: get all the detail figure out, then do the surgery in one shot so the car is not down for too long update: it could not be the head gasket Read some of this forum and mendel signature, also watched this video: in this video, they talk about symptoms exactly I am having They talk about EGR valve and PCV port problems, they get clogged and oil somehow get into the intake I still do not understand the point of EGR valve and th PCV valve, read up on them and comprehend them the issues that indicate it is not head gasket: When you go full throttle, no shaking/misfire, but when you drive flow of traffic, there is shaking In the video, he discuss this being a symptom of bad egr/pcv valves Why does it have the EGR valve? In the video, he puts a spatula blocking the whole system, and the car works fine New plan: first clean the EGR valve and the pcv valves, then see if that help Can we go without these systems? What is the point of them? Try to research these two questions in the meantime while data is coming in update: now you understand why our engine is eating its oil, unbelievable in this clip, you get your exact answer as to how the prius engine can eat its own oil if EGR valve clogged if throttle is at 0, and your egr valve is clogged, now the engine is starving for air the vacuum will pull oil from the PCV valve from the bottom of engine into the intake manifold wow yes, now that new data come in, adjust your plan: Clean you out that EGR system and that should solve your engine eating its oil
The head gasket replacement may not take care of your intermittent misfire, if it's due to oil fouling your spark plugs. There's three ways oil gets into your combustion chamber: gummed up low tension piston rings, valve guide seal leaks, and scored piston walls. You need to figure that out first! You'll probably also will need to replace your CAT in the near future, due to the high oil consumption. IMHO, you should buy the head gasket rebuild kit, that should have new valve guide seals and other gaskets you'll need to do the job properly. The really good ones has new stretch bolts replacement. Hope this helps.....
you've had enough of the misfire/shaking fix it already, today is the day you point: this is the valve that get clogged and suffocate your japanese engine open everything up, let your engine breath so you can glide across your realm take you out whatever in your way up close of inside egr valve, filled with carbon ton of accumulation on your egr pipe maybe dissassemble the whole valve, go tinker with it i show you what you fixing to do this plastic manifold is filled with sut/carbon since, your engine has been breathing exhaust gas for a quarter million mile, and tons and tons of idling where only exhaust is going into your engine keep dissassembling, take you out more harnesses, take you out your intake manifold look inside your intake manifold, filled with gunk trying to take out the plastic manifold, started taking off lines, one of them filled with coolant, splash coolant into your eyes suspicion: there is a coolant line going to the intake manifold that maybe cool down the exhaust coming back into your engine plan: get you some files and part cleaner, go you into your engine cleaning out the gunk breaking it down with part cleaner, hit everything with compress air plastic manifold complex: leave it as it is, clean it using the same protocol outlined clean you out your intake with: use paint brush to apply generous part cleaner, go in there with your file, hit the entire area with compress air tried to put it back together, put back the harnesses to see if she would run, no, "check hybrid system", tinker with it more tomorrow you ponder: if all the harnesses are connected, and the pipe that puts exhaust back into your intake is not connected, does the car know not to run? pretty sure you had all the harnesses connected but the computer would not let the engine turn on This setup is fundamentally flawed, you wonder if the old Prius has a simpler setup do not touch this engine bay without gloves, it seem like they make so much sharp plastic all over the place just to intentionally not let you fix it This job so far is making you not like this generation prius, and want to look into older prius to see their design
Sounds like runaway oil consumption as well. Consider replacing piston/rings, or safer with those miles and history: new short block. my 2 cents: time for another car.
