2010 Prius II Engine Missfires

Yes, many have. This is the main reason I am ditching this vehicle. The old intake manifold allows moisture into the engine compartment after interrupting a warmup cycle and leaving the vehicle to cold soak for 5-8 hours. The engine responds with a knock/rattle/misfire and an associated smell of gas (and won't necessarily throw any error code). If your dealership demands that the issue be repeated (like mine has), you are likely to be left high and dry as you argue with the dealership and Toyota Customer "Service" that your vehicle is covered by the specific TSB and within the applicable VIN range. If you have other nearby dealerships, you can try your luck with them of course. Next for me is arbitration, but I have just decided to take a loss on this vehicle and trade it up for a c instead of going through the headache of convincing Toyota to honor the warranty and fix an obvious defect. Yes, I'm bending over, taking it on the chin, etc' but that's my life story.

It sounds like your dealership didn't rake you over the coals or they actually managed to repeat the problem themselves (less likely since you've only had it occur two times in 33,000 miles). I managed to have the problem first occur around 5000 miles and then repeated it 3 times this year in my semi-controlled environment.

You can test the efficacy of the fix by waiting for a cold night (under <40F preferably and even with a great deal of moisture to increase your odds), starting the car, interrupting the warmup cycle 5 seconds after the engine starts and come back the following morning and fire her up. Try it in at least 3 separate instances for extra peace of mind that it has properly been addressed. So far, it hasn't reoccurred for anyone who has had the fix done.

 

Yup, the lower the temp, the better chances of it happening, though I've heard of it occurring even in temps as high as the 50s (maybe higher?).

I liked it as well aside from this (major) issue...I threw the dice and traded "up" for a C. I hope this isn't like going from the frying pan into the fire.

 

Why not just pick up the new intake manifold online at the discounted price online and bringing it to the local auto repair shop to get done? Sure it will be a couple hundred bucks but it's better than taking lube in the rear because of a trade in.

Anyway, back to the OP, you should try another advisor who has seen more Prius. The dealership I go to has over about 15 advisors, so far from my 3 visit, NONE of the ones I met knew anything about the problems associated with the Prius including the simple constant beep to one beep ......

 

Wellllll, I'm new to the area and don't have any established trusted mechanics...so I figure I'd take a screwing I know versus a screwing I didn't know.