Engine starting getting more forceful?

have you cleaned the egr circuit? throttle body?

 

Mine lurches forward like a quick jerk when car has started up with ICE still trying to warm up at times, still happened even after changing ATF with the help of Raytheeagle. From the info I gathered here is that the transmission does that to prepare the vehicle gears, engaged, to be driven away. My passengers all gets scared when that happens, but if you use parking brakes it minimizes the sudden jerk pull. Same goes for the rocking back cutting power off, but only decline hills so use parking brakes for that also. In fact, always use parking brakes.

 

I would not expect transmission fluid to play much part in this- there is no torque converter, thus no fluid-borne thrust, and there are no friction clutches or drums in a prius transmission. The oil is really there just to keep the gears from wearing, like in a traditional dry-plate manual transmission. It's got the added duty of cooling the motor-generators but that's about as weird as it gets.

I think this is a question of the engine not starting as smoothly as it used to, rather than the transmission expressing more vibrations through to the car than usual.

I know the prius engine will slide its valve timing to enable a low vibration startup through reduced compression, and fuel injection math needs to be precise for this to work. If the car is getting bad air data (temp, mass flow) that could cause it. Maybe a dirty injector creating a delta between what the computer thinks it is doing and what it is actually doing? That could explain it too...

 

It’s normal. Everything is getting a little sloppy over the years. My bought new 07 would start and shut off pretty smoothly when new now 11 years and 130000 miles later there’s a lot more clunking drama especially on shut down.
Much more.

 

I'd go for throttle body clean and manifold too, this makes a big difference when ice fire's up. Just done a friend's today took about an hour and a half and the difference is huge, got another gen 3 on the way too me now to have his manifold cleaned. I'd go as far as to say evey prius with more than 100,000 miles on would benefit from a quick clean. These get pretty clogged. A couple of pics of today's gen 3 with 160,000 miles.

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Next one has 230,000 miles and has never been touched but has engine light on with low air flow though egr recorded

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If doing the intake manifold and it looks like that, the egr cooler needs servicing as well.

Good luck .

 

Already on the ball with that one but guy is another taxi driver and just wanted that doing first, he did say its faster and smother already so we will just wait and see if he comes back for the rest cleaning.
Did my wife's 2 years ago and have been waiting for engine lights or rough running to prompt me into egr cooler clean but it runs superb without being done so I've left well alone.... 215,000 on that one.

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Since I've never pulled that part off..... Is that a screen or something (that orange/red part) under all that goop?

 

Just a orange o ring seal

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That’s one of the worst egr pipe to intake manifold inlets I’ve seen.

How much oil is that Prius consuming?

While the car may run better, that egr cooler and valve will be close to plugged.

The longer you wait, the closer the head gasket time bomb approaches.

 

Can only advise people, after that it's up to them, car had been using oil at about a litre every 2000 miles as he was using it for fast motorway work, but now just town driving its settled down to about a litre every 10,000 miles

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Car number 2 done, not as bad as first but still dirty

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Thats horrible but really good pictures thanks.

 

You should email those to corporate Toyota, post on Instagram, I don't know what. This is a black-eye for Toyota.

Hey, we can play "spot the egr passage":

 

Light came back on with this one within 20 miles so defenitly blocked further downstream, engine light has been on for 2 years so maybe this would explain the whole system being clogged up.

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Well just done my: own manifold clean as I'm doing everybody else's so why not.
Turned out not to bad.... 106,000miles

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Still more wet deposits than I’ve seen over here .

But good to do it early before it gets worse.