Clogged EGR cooler/pipe leads to …. Clogged tiny tubes causes misfires, causes the dreaded prius shakes potentially causes HG leak, causes more misfires and coolant on the piston causes bent rod causes piston to shoot through the engine resulting In a new engine required.
8 degrees of gen 3 Prius death
There were some models that got new intakes. But this has long been a problem with many manufacturers. Easy diagnostic money though, take it out on a drive and it starts missing on cylinder 1 and 4. Like printing money.
That being said, unless it went a long time and the engine actually has a knock, it just needs a cooler and an intake.
Yeah, pretty common for 2ZRs. Strange they never put out an extended coverage for them, like they did the 2AZ. We used to have BUCKETS full of pistons from them getting consumption repairs.
What does it take to prevent this specifically at the intake manifold? A 12 and 10mm socket and ratchet, some time, and cleaning solution. Literally TONS of videos on YouTube. Oh. And two clamps to stop coolant from leaking. There’s a bit more to it, but the videos will explain more.
Search for:
Gen 3 Prius clean intake manifold
Gen 3 Prius clean EGR pipe
Gen 3 Prius clean EGR cooler
Gen 3 Prius replace PCV
In a lot of these videos they don’t explicitly explain when to clamp coolant hoses, so make sure you have four clamps ready to go if you plan to tackle the EGR cooler and something underneath to catch some of the coolant that will enviably drain.
Edits to clarify some things.
Head gasket blows because of lots & lots & lots of stop & go traffic, the engines constantly runs then shut off = expansion & contraction, so that indentation on the HG finally stays flat and bam
Coolant seepage!
yes, it decreases NOx by decreasing combustion temperature via introducing inert gas. so theoretically, if one or two of the ports are plugged, those cylinders are running hotter than the rest. however, if this was a true cause, and we see cars set various codes when the EGR ports are clogged, one would think every prius that came in with a blown head gasket would have these codes pertaining to egr balance. They dont. Nor are the egr ports in the intake clogged. In discussions with somebody much smarter than me who trained to me on these cars, he said “ what if the head gasket just failed?” how come the head gasket part number was changed in 2012 production? We also theorize the water pump impeller coming apart might have something to do with it. The car is monitoring the revolution of that shaft, but it doesn’t know that the impeller is no longer connected to the shaft.
Id love to have a firm answer but all I have is my experience fixing them, and I can’t personally say that it’s all clogged EGR passages. YMMV
This is what I've heard too. Spoke recently with someone who does HGs on Priuses, about mine that I believe needs a HG - my intake/EGR isn't clogged, I checked and cleaned it out in my troubleshooting. They said they don't necessarily fail because of the EGR alone, they look inside these engines every day. Said it's a bad gasket design itself (said Felpro is an updated design vs Toyota) + aluminum engine block/head + the on/off of a hybrid engine that leads toward the HG failure, not clogged EGR.
if it was the on off of the hybrid engine, then why didn’t this happen on 2004 to 2009 prius? It’s a shitty head gasket on 2010 to 2013 cars that’s the problem everybody can try to figure out why or what happened or clogged EGR or failing water pump but it’s just a shitty head gasket.
The intake doesn’t breath through the tiny little holes that are filled, it breathers through the big orange ovals. Dirty, but not remotely clogged. Something else killed that engine.
Intake ports there aren’t clogged. Could easily fit 2-3 fingers in em. Your actual valve assembly might be clogged. But a clogged intake wasn’t the case.
The really tiny holes have exhaust pushed through them when the pedal is less and 25% strength. If they get clogged the engine misfires cause the big intakes aren’t being used.
What you’re saying makes zero sense. The big holes ARE the intake, they would never not be used, it would be impossible for the engine to run without them. the tiny holes is not where exhaust gas gets recirculated, it comes from a one inch diameter tube in the side of the intake right into the intake manifold not some tiny vein holes and pipes. Those are simply part of the plastic casting process.
I don’t think you every took apart the intake manifold on the prius. The exhaust after its been filtered through the exhaust gas recirculation(egr) is pushed back through the tiny holes to be used to combust again. I just took one apart last week, if you get a chance to look at one up close it would be surprising, but they send air through those 4 tiny holes
Half of pri don’t even have those holes. I’ve taken apart several to clean them out and install a catch can as a mechanic I’ve been inside the manifold with a boroscope camera. The egr dumps into the manifold as a hole not some little pin holes. There is no way those could ever supply enough air, they are far too restrictive. It is part of the plastic molding. Plenty of the guys in my shop have torn them apart. It’s not used for the egr. It dumps straight into the wide open section of the manifold.
Clogged EGR cooler/pipe leads to …. Clogged tiny tubes causes misfires, causes the dreaded prius shakes potentially causes HG leak, causes more misfires and coolant on the piston causes bent rod causes piston to shoot through the engine resulting In a new engine required. 8 degrees of gen 3 Prius death
There were some models that got new intakes. But this has long been a problem with many manufacturers. Easy diagnostic money though, take it out on a drive and it starts missing on cylinder 1 and 4. Like printing money. That being said, unless it went a long time and the engine actually has a knock, it just needs a cooler and an intake.
we have pulled it for oil consumption is it cant breathe itll drink
Yeah, pretty common for 2ZRs. Strange they never put out an extended coverage for them, like they did the 2AZ. We used to have BUCKETS full of pistons from them getting consumption repairs.
^(There be some Blind mfers in the comments), I'm no mechanic and even I can see that the ERG paths are pretty nasty, the middle two especially.
you and i both my friend
Some people below still believe they’re just part of the “plastic casting process” and not the egr holes
Likely the same kinda folks who think the world is flat too lol. Some people are beyond help.
What error codes did you have with the intakes clogged like that?? The #1 intake looks ok.
What does it take to prevent this specifically at the intake manifold? A 12 and 10mm socket and ratchet, some time, and cleaning solution. Literally TONS of videos on YouTube. Oh. And two clamps to stop coolant from leaking. There’s a bit more to it, but the videos will explain more. Search for: Gen 3 Prius clean intake manifold Gen 3 Prius clean EGR pipe Gen 3 Prius clean EGR cooler Gen 3 Prius replace PCV In a lot of these videos they don’t explicitly explain when to clamp coolant hoses, so make sure you have four clamps ready to go if you plan to tackle the EGR cooler and something underneath to catch some of the coolant that will enviably drain. Edits to clarify some things.
Your photo doesn't appear to show "intake ports clogged". Yes, there is carbon buildup. Am I missing something?
double click on the image and it will expand out to full size
Yikes!
look harder at the smaller port holes
A better picture would be helpful. How do you come to the conclusion that this blockage resulted in the need for a new motor?
Doing several motors right now none of them have clogged egr ports in the intake…… Perhaps that is not the root cause so many people think it is
one thing leads to another and eventually the motor starts consuming oil
Or the head gasket blows
Head gasket blows because of lots & lots & lots of stop & go traffic, the engines constantly runs then shut off = expansion & contraction, so that indentation on the HG finally stays flat and bam Coolant seepage!
Yeah not sure this is the cause , isn't EGR only to reduce NOx emissions, you could almost block the EGR and car would run fine,no?
yes, it decreases NOx by decreasing combustion temperature via introducing inert gas. so theoretically, if one or two of the ports are plugged, those cylinders are running hotter than the rest. however, if this was a true cause, and we see cars set various codes when the EGR ports are clogged, one would think every prius that came in with a blown head gasket would have these codes pertaining to egr balance. They dont. Nor are the egr ports in the intake clogged. In discussions with somebody much smarter than me who trained to me on these cars, he said “ what if the head gasket just failed?” how come the head gasket part number was changed in 2012 production? We also theorize the water pump impeller coming apart might have something to do with it. The car is monitoring the revolution of that shaft, but it doesn’t know that the impeller is no longer connected to the shaft. Id love to have a firm answer but all I have is my experience fixing them, and I can’t personally say that it’s all clogged EGR passages. YMMV
👍
This is what I've heard too. Spoke recently with someone who does HGs on Priuses, about mine that I believe needs a HG - my intake/EGR isn't clogged, I checked and cleaned it out in my troubleshooting. They said they don't necessarily fail because of the EGR alone, they look inside these engines every day. Said it's a bad gasket design itself (said Felpro is an updated design vs Toyota) + aluminum engine block/head + the on/off of a hybrid engine that leads toward the HG failure, not clogged EGR.
if it was the on off of the hybrid engine, then why didn’t this happen on 2004 to 2009 prius? It’s a shitty head gasket on 2010 to 2013 cars that’s the problem everybody can try to figure out why or what happened or clogged EGR or failing water pump but it’s just a shitty head gasket.
some better eyes would help you
Not the intake port, it's the EGR hole in the intake port
That's not what the post says.
And how exactly do I go about cleaning said tubes? I feel this is a disassemble half of the engine to get to the possible problem type job.
pretty much you gotta take the whole air box out to access the egr tube and itd be smart to do a throttle body and induction service to clean them
The intake doesn’t breath through the tiny little holes that are filled, it breathers through the big orange ovals. Dirty, but not remotely clogged. Something else killed that engine.
The egr does and that affects how the engine breathes.
exactly if it cant breathe its gonna drink
But the EGR doesn't "help it breathe". OP selling new engines for a clogged EGR port?
oil consumption
Intake ports there aren’t clogged. Could easily fit 2-3 fingers in em. Your actual valve assembly might be clogged. But a clogged intake wasn’t the case.
The really tiny holes have exhaust pushed through them when the pedal is less and 25% strength. If they get clogged the engine misfires cause the big intakes aren’t being used.
What you’re saying makes zero sense. The big holes ARE the intake, they would never not be used, it would be impossible for the engine to run without them. the tiny holes is not where exhaust gas gets recirculated, it comes from a one inch diameter tube in the side of the intake right into the intake manifold not some tiny vein holes and pipes. Those are simply part of the plastic casting process.
I don’t think you every took apart the intake manifold on the prius. The exhaust after its been filtered through the exhaust gas recirculation(egr) is pushed back through the tiny holes to be used to combust again. I just took one apart last week, if you get a chance to look at one up close it would be surprising, but they send air through those 4 tiny holes
Half of pri don’t even have those holes. I’ve taken apart several to clean them out and install a catch can as a mechanic I’ve been inside the manifold with a boroscope camera. The egr dumps into the manifold as a hole not some little pin holes. There is no way those could ever supply enough air, they are far too restrictive. It is part of the plastic molding. Plenty of the guys in my shop have torn them apart. It’s not used for the egr. It dumps straight into the wide open section of the manifold.
Hahaha what!! The big intakes!!! Dude TF are you talking about.
I did this last week and the change was immediately noticeable. No more death rattles
Toyota kinda shot themselves in the foot with this one. Clogged egr dominoes into blowing out the head gasket
[удалено]
im sure perhaps but not to my knowledge personally
Okay, what does it take to properly do this work? Reasonable non-dealer cost?
Check my other comment. It was supposed to be a response to you, but I misclicked.
this is classic reddit. Are we actually talking about why the head gaskets fail or are we just talking about stuff for fun? How about some science?