Death Rattle

Don't worry about it unless it happens again.

 

EGR is starting to get plugged the passageways and the intake manifold the silver cooler and such search threads here you've got 35 days of reading . These are not the ones. But that's a personal discovery only you can make.

 

Which is to say that the car was not properly maintained......

There's only TWO reasons that heart attacks "never happened again......"
1. There is a change in behavior.
2. OR? There isn't -

You have a ten year old car - which is the same thing as having a ten year old dog, quite frankly.
You can get another 5-10 years out of it, but you're going to have to work at it a little bit more.

EGR cleaning.
FIRE your dealership and hire somebody that will not BENEFIT from you needing a new car!
You "may" want to consider looking at your warranty and maintenance guide and determining which of the 0-120 month maintenance items have been done and which have not been done.

Or?
You could do what the previous owners did.
Dump the car for a new one that will last around 100,000 with "dealer maintenance."


Good Luck!

 

So this vehicle at this mileage has none of the fun stuff done yet

 

It could be condensation that was in the throttle body / intake manifold that gathered from putzing around in very humid conditions on the previous drive. Sort of like old fashioned 'Carb Ice'. That's why the throttle body has coolant running in it, to keep it warm.
But ice could form near the throttle plate where intake air temp drops in temp due to the rapid pressure drop. imo

That 'ice/moisture' then settled into a pool on the bottom of the intake and it had to be digested at the next start up.
This is just my SWAG....(scientific wild azz guess)
It happened to me ONCE in a coastal city. I had been driving in fog the night before. That Prius never showed symptoms of the chronic head gasket failure before being sold a year or so later.

Keep in mind, if the head gasket is failing, the coolant level will be dropping.
Keep an eye on your coolant level if you have any suspicions.
If the coolant isn't dropping there is no testing anyone can do to predict when the head gasket will fail. imo

 

With only 75k, it “might” just be moisture sucked in through the intake manifold. It can be due to a very short engine runtime (just a few seconds) the previous day.

that said, I would NOT heed the dealership’s advice, get on EGR cleaning ASAP. More info in top two links in my signature (on a phone turn it landscape to see signatures).

 

With 75k miles, good gawd, no.

 

I watch The Car Care Nut too, but his stance on dealing with 3rd gen EGR seems coloured by his dealership years. They will never stoop to cleaning, just slam in fre$h part$.

Again, have a look at top two links in my signature (on a phone turn it landscape to see signatures).

 

Yes we're well aware you need to clean that silver cooler or have a replacement very

 

Well, it could be (wait for it), early-onset head gasket failure. In which case the maintenance would be to replace the head gasket, fully clean the EGR system, and repeat the cleaning at least every 50k miles.

Assigning symptoms vague names (death rattle) just keeps you in the dark. It's very likely liquid in the combustion chambers, which is difficult to compress. The pistons and crankshaft struggle, bearings are stretched, the damper between the crankshaft bears the brunt of it, can break springs.

 

You have a 2015, right?
That means 10 years and 75,000 miles!

This means that you're going to have to apply a little common sense to the tasks listed in the Warranty and Maintenance guide for 120 months.
Clean the EGR loop (i.e. cooler) Consider not changing out the plugs as indicated BUT if you do beware or scam (fake) plugs and coils from Amazon and while you're inspecting the plugs stick a borescope down the holes and see if one of your pistons has been 'steam cleaned.'
- stuff like that.

Keep us posted.....