Prius v (lowercase v) Engine knock if not warmed up upon previous ICE start

Not solving your issue, but to avoid the few seconds of engine run up: do you have maybe 10~15 seconds of EV grace, ie: a brief interval before the engine fires up? For a shift around the driveway you might be able to dodge engine start up, if you shut down fast enough.

I try to do that with ours, am mostly successful.

 

I wouldn't assume anything "horrible" is happening. If anything its just standard engine knock due to a fuel mix anomaly.

You can also put the car into "acc" mode and shift to neutral - push it to where you want it.

 

it's the same engine, no? the dealer can't do anything, because toyota has been unable to figure it out. i came home last night, and my engine had just started. so i left it running with the garage door open, intending to come out and shut it off in a few minutes. 6 hours later, my wife tells me the garage door is open and the car is on.

 

Better than "my wife tells me the garage door is open and the car is gone..."

 

agreed, 30-60 seconds of under 10 mph ev is definitely overdue.

 

The UK versions of the Prius and Prius plus (US v) do have EV when cold if the HV battery has more than 2 bars left and you press EV before the ICE cuts in (within the first 15-20 seconds).
I can drive up to 20 mph until the HV battery gets down to two bars if I don't accelerate hard, do you not have this facility in the US ?

 

no, unfortunately, if the engine is cold, it has to fire up for emissions purposes. you get a few seconds depending on how cold the ambient is.

 

You are correct about getting a few seconds on battery before the engine "fires up." Sometimes I want to back the car out of the garage to check the tires or wash it and never make it for than about 10 feet. Wish it would go for a minute or two. I ran into the severe knock/vibration and now just let the engine run until the shuts itself off and it never happened again. The engine runs for about 3-5 minutes.

Seems like there would be much less emissions if I could run on the battery rather than running the engine just to move the car a few feet.

 

agreed! why does the uk get all the good stuff?

 

I have a 2012 v wagon, it was listed on the TSB recall, was fixed, and have had no issues since. Check with your dealer.

 

A theory...you start the car, the engine is cold, the injectors are told to push more gas into the cylinders similar to the old choke, you shut it off quickly while it is still stuffing gas into the combustion chambers. Now you start up and the mix of residual gas and newly injected gas is way to rich and you get a bigger burn than normal.

 

i like it. i wonder how JACoH's new manifold is remediating this. and why don't other cars have this problem?

 

You mean like the extra row of seats and the Lithium battery

 

exactly.