Gen 3 head gasket

Try a leak down test.

 

EGR/Intake cleaning and oil catch cans, are preventative measures; they won't reverse the course of a failing head gasket.

Another thing to try is a boroscope inspection. Look for coolant in the cylinder, and/or a steam-cleaned look to one cylinder in particular. When the head gasket fails it's often cylinder one.

BTW, when was the cleaning done, recently? How bad was was it?

I wouldn't bother with replacement intake; cleaning's as good as anything. You got the EGR passages, one per port?

 

Even easier than a leak down test is popping the lid on your coolant reservoir on the left side. If it sucks air in when you open it, that means coolant is leaking into combustion chamber due to blown head gasket.

 

you cleaned the egr pipe, and the egr?

 

The pressure in the tank will be there even after it has cooled.


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For really minor blown head gaskets that don't yet show much for significant symptoms the cap needs to have been sealed for a long time to get that classic "whoosh" type sound. What I like about that approach when I help people with diagnosis is that they're standing there and its the first thing I do and once they hear that noise...

 

Can you let us know what you decide to buy for a scope? As well as what options you considered? I'm particularly interested in the least expensive option and have you, rather than me, determine if its good enough or too cheap. ;-)

 

Im not trying to sway you away from the HG, but what oil is in the engine??
I just bought my newest-to-me Gen3, this one has 84k miles and it rattled on startup every time when starting cold. Last oil change was 1,500 miles ago in November 2020 according to the sticker on the window, and the service history on the Toyota owners site. It was rattling on startup for a brief second, when cold.

Drained out the oil with 1,500 miles on it, looked fine although seemed thicker than 0w20 that Im used to, refilled with 0w20 Mobil 1, and a new oil filter and the engine no longer rattles and is smoother than ever. I do not know what was IN that engine, but it either wasn't 0w20 (dealer bulk oil of a different viscosity, maybe 5w30 or 10w30?) or the oil was diluted or somehow became marginal

 

Last year for a different project, I bought a digital boroscope ("inspection camera") on Amazon for like $70. Too bad you are in MN, I'd lend it to you, but it would be perfect for the job.

 

is your oil milky or under engine cap has milky goo ,if you start when very cold outside ,the start knocking will be worse if its bad hasket ,personal experience of bad gasket 2010 prius