Does the Prius C have an EGR circuit or not?

Good to answer to own question.

I wonder if @bobzchemist ever sold his misorder?

He might be able see if there are subtle differences for comparison.

 

I don't think anyone's ever cobbled together a "repair manual" pdf, for the c? Or v for that matter.

 

Our resident librarian hasn't?

Something to work on in your free time.

It would save the garage queen from more prodding anyway.

 

Yeah, i actually highly doubt that there are any reports about clogged Prius C EGR. Same for oil consumption.

 

So what's the verdict? Does C need a EGR cleaning?

 

I don't mean to be rude, but why do this?. EGR clogging isn't an issue with the Prius C. Heck, you don't even drive one, so why care?

 

I guess the reason is that we are not sure if it is no issue or unknown issue. @farmecologist is concerned that his PriusV may behave similarly with the C.

I do have a 2012 Prius C with about 110k miles. But I am NOT familiar with the EGR system, so don't want to mess with it unless there is a Youtube for me to follow.

 

Yes, we're sure. There is not an issue with the EGR system on a Prius C. I've spent YEARS of my life working in GM/Toyota dealership. It's not an issue....

 

@dubit Good to know, so we don't need to worry about cleaning the Prius C EGR system. Care to elaborate why it is an issue for Prius but not for Prius C?

 

Not the same design.
And I think that it is not a problem on all regular Prius models either.......and people sometimes think it is a bigger deal than it really IS.

 

@sam spade 2 I thought it was a big deal because many Prius got head gasket blown due to EGR clogging. Maybe I get that wrong?

 

There does seem to be reported an unusual incidence of head gasket problems in Gen 3.

And it does seem that many Gen 3 owners check their EGR systems and find them clogged.

And there is a vigorously thriving PriusChat cottage industry of claiming that causality is established between those two things.

The claims toss around various supposed explanations of the supposed causal relationship, such as an always vague "gets hotter", and the cottage industry never gets any more industrious about how any of those supposed explanations could be tested, or what would constitute evidence for or against them, or even trying to put the various different supposed explanations into some kind of order by plausibility, or even acknowledging that it's kind of weird not to do any of that.

So we perennially stay right where we started: head gasket failures and EGR clogging seem to be two things that can happen to Gen 3s.

I don't see anything about the EGR system in the c that suggests a different design, other than fitting in the components above the engine rather than off to the side.

 

I wonder if both the EGR clogging and head gasket blown are related to excessive oil consumption in Gen 3: The clogged oil rings in Gen 3 induce higher oil burning and blow-by. The higher blow-by brings more oil via the PCV route to the cylinders and further increases oil burning. This excessive oil burning contributes to the EGR clogging, which in turn causes higher cylinder temperature and results in head gasket blown.

 

Yeah, you're not the first to the party, that's one of the speculative chains of causality that have been endlessly spun around here as a way of taking two things observed to happen and claim to know more than that. Nobody ever steps up to do any of the homework that could start backing it up, say, just starting at the end of the chain working backward, the first two necessary questions would be:

- blowing a head gasket due to cylinder temperature requires temperature of at least ... ?

- EGR clogging makes ... ? difference in cylinder temperature

Nobody wants to be distracted by details like that. So we have 9,453,272 posts all saying "yep, it's X leading to Y causing Z meaning hotter meaning head gasket" and zero posts that show effort to find out if it's true or not.

 

It depends on your definition of "many".
The problems seem to occur only or mostly with only one of the various engine designs.
And the mileage usually is very high.
And there are a lot MORE still on the road that do not have that problem.
And finally, I don't think that anyone has any good proof that a "clogged" EGR loop is the cause of head gasket failures.
If you know how an engine works, that theory really doesn't make much sense.

 

@sam spade 2 "If you know how an engine works, that theory really doesn't make much sense." Care to elaborate?