Violent engine shakes at low temps

Had a similar thing happen with a Kia I owned, and turned out to be a coil pack.

 

It would kick out the misfire codes you got. The Prius has coils on plugs (COPs).

 

It may be academic, but I wasn't aware of such a unit on the Gen 2 Prius. It sounds like you're talking about the coolant heat recovery system, and the pump, three-way valve, and temp sensor are separate items, with separate codes. If you're sure it has no bearing on the problem, fine, but it's a minor confusion in a confusing situation.

 

Also, what scanner are you reading the codes with?

 

Again, there is no coil pack. There are four separate coils, and it's doubtful that's the problem in this case, if you're getting multiple misfires. Inspect their condition when you change the plugs.

Be careful with the TB cleaner--don't flood the TB as you normally would. Wipe it down carefully with a rag.

 

I agree with Andrew since your getting multiple misfires it would have to be multiple bad cops.Maybe bad gas? Multiple misfires are usually mechanical issue with engine. Lots of sub harmonic vibration that you would feel in the cabin..

Op you never answered my oil question. How much oil does it eat? And how low did it go on your trip?

 

Cooling fan cycles on/off somewhat like that. Maybe some connection?

 

I've never witnessed a VVT system failure. I wonder if cold engine oil temps could be causing a problem with that. It might be worth checking the VVT filter, there are threads here about that. Just a SWAG.

 

That's a blown bottom end. It's not missing it's banging.

A 160000 mile g2 that doesn't eat oil especially a lot of oil on a 1200 mile road trip is a miracle.

What kind of oil are you using and how often?

 

But you say it then goes away so maybe it is a cop There's a YouTube of a g2 with a bad cop making the same sound but sounds pretty bad.. But a bad cop usually doesnt fix itself.
Maybe there's water in the spark plug well that's pretty common.
I would only use Toyota oem cops.

 

I had this happen and clean and lube the throttle body flap with a copper brush holding open with the spring on the side and you should be able to hold open tbe throttle using the spring. if you can't lube spring and motor
Also did spark plugs and pcv valve at the same time. then put the car in maintenance mode then pour seafoam down the throttle body avoiding the sensor with a funnel and have somebody floor the gas. it normal to have a lot of smoke out tail pipe and if it throws a error code just drive 5 min power off car drive 5 min power off car both error will clear then you done it would do it up hill too
I see 1cup seafoam and 1 cup Marvel Mystery Oil in the gas works really good boost mpg too

 

1. What was the condition of the other three spark plugs?
2. So would you say the cyl 1 spark igniter was intermittent?

 

VVT Oil Filter? Poor MPG'S?
https://priuschat.com/index.php?threads/81138/

VVT Oil Filter? Poor MPG'S? Clean the vvt sensor and filter under it. Remove air box left side 1st Cylinder On front of engine Sensor with wire Side mounting book remove bolt twist and pull out Clean oil off and lube with light oil right below that there is a hex bolt Behind that is a filter that's attached to it made of wire clean with copper brush and carburetor cleaner reassemble had a 50% power boost Ticking when cold when away or pinging when cold no power ip hills 5min fix

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