Death rattle

I presume toyota won’t cover HG’s?

 

If they do, we’d have pigs flying all over

 

I sold it to my grandson. It will never sit long enough to collect what ever gaseous evil is causing this. Plus his dad and and I have the skills to R&R an engine or fix the HG should that ever happen. it is not leaking coolant at all and the death rattle only happens after sitting idle in cold weather in my garage.
I have found “push button, floor accelerator to start” seems to avoid it.
Personally, I suspect the vacuum at start liquifies gasses that temporarily foul the plugs much like a “dew point” with water, except caused by the pressure drop under vacuum. I’ll leave the rest to the physics majors!

 

Need a bit more back story. What the miles, symptoms?

 

It's blow-by condensed in the intake. An oil catch can will fix this.

 

Illegal in California. But there is a long interval between smog tests like four years or something. I’ll bet a splice so you could remove it would cause you to flunk.

 

Less than 90,000. I did a EGR cleaning out per instructions here @ PC. It only happens during a two or three day cold soak. But “forced start” is helpful. (Start button, floor gas pedal when dash icons appear). Not losing water.

 

In formation!

 

Ask them for a three year 50,000 mile warranty.
if your head gasket isn’t leaking why burn the money.
I hear talk of getting used engines, but really. How good are they? Good enough for a 50k and 3 year?
Toyota built a bad engine and they know it, yet AFAIK it has been one patch on top of another.

Oh well. I must be grouchy today..

 

Uh... a (partial) vacuum would tend to encourage evaporation of liquids, not condensation of gasses into liquid.

 

If the gas was saturated, wouldn’t liquids precipitate like dew?
Which makes me wonder if anyone has tested removing the air intake to the manifold for test purposes. Thus introducing air into the throttle body known to be “clean” air.
Lastly, starting by immediate 100% gas pedal seems to help.
Standardized testing would help.

 

Liquid would precipitate if you cool your saturated gas (example: dew forming), or compress it (example: condensate collecting in a compressed-air system). Water can certainly be condensed by cooling exhaust gas or cooling the PCV mixture of gases, both of which inevitably include a healthy dose of water vapor.
The last time I got an alarmingly rough start (which wasn't recently), I tried depressing the accelerator, and couldn't tell it helped at all.

 

Never seen somebody put putty in an EGR valve before

 

It's been cleared up, a putty knife to block the EGR path, no putty involved.

Posted via the PriusChat mobile app.

 

What do you mean by “death rattle”? The engine’s shaking? All the time, or just at start up with cold engine? Is engine coolant level stable in the reservoir?

You say you replaced the EGR valve? Yourself, or a shop? Any specific reason for replacement? The EGR valve/cooler combo was pulled in this process? Was the cooler cleaned?

What’s the miles now, and current symptoms?

 

"seemed like?"
Any coolant level issues in the past?
I'd pull the plugs and examine them.
Then bore-scope the cylinders and do a leak-down test.
If you cannot do this yourself with a few basic hand tools and $75 worth of stuff, swap technicians and have those two tests done again.

It think the death-rattle is exactly THAT.
You did the angioplasty but the patient still has some cardio issues resulting from the plugged EGR before that treatment.
There might be some technician incompetency or greed involved as well.

Independent or Dealer?

 

Typical of hg

Diagnostic of hg and eliminates plugs, coils and injectors.

Death rattle on a high mile Prius is 98% head gasket. Most mechanics are not familiar with diagnosing a hg on these. Pressure tests like leakdown and compression are useless. No coolant in oil. No combustion gas in coolant. Still a head gasket.

Wishing and hoping won't make it go away.

 

@Ethan Guzman The above quote was from your previous thread, same title. Starting a new thread only breaks up the narrative. If you contact the moderator and ask, I think he could close this and tack everything here onto the previous thread. Use this button:

 

Hi all,

Hope I am posting appropriately. I also had the death rattle on my 2013 Prius V wagon (160,000 miles). Had the oil changed at a quickie lube place, one week later, the death rattle! Not assuming the lube place did anything to my car but may be relevant. Death rattle only happened when excelerating after a stop for about 5 seconds, then stopped. Brought to a well respected, legitimate shop, they told me I need a new engine. Check engine light was not on prior to bringing to shop, it was on after I picked up the car. The cost of a new engine is not worth it (especially since I just dropped $3700 on a new catalytic converter 2 months ago) so figured, i'd drive the car till it stopped working. Have been driving for about 250 miles. Still driving and death rattle is gone! However, coolant is now leaking! Had to pull over the other day due to tons of steam. Filled coolant yesterday and check engine light is now off. Wondering if I actually need a new engine or maybe just need some other kind of repair.