Still P0401 after cleaning egr !! should we drive it?

Hey Mendel, it's a little cheaper on eBay mate, I have messaged a couple eBay members that are selling good used valves really cheap to ask if they will send to AU but no reply yet lol! Theres a ton of good used valves getting about on there just not in Australia, surely I can source one somewhere, maybe someone will chime in over the easter period if I'm really lucky

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My thoughts are the plastic thread in rotor gets flogged, so the rotor starts to run unevenly until it's so bad the dimple can glide over top of the plastic stop

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Thanks very much ChapmanF, this is extremely informative information for myself and priceless for the people that come after me chasing this very same problem on their prius, corolla or lexus ct200h which could possibly suffer from the same fate if lucky enough to get the mileage up!, my car has approx 450,000k km but it had a replacement engine around 80k km/ 3 years ago (@370k) I can not confirm if the replacement engine came with a cooler and valve assembly or the egr parts have been transferred over from the original engine! I'm leaning towards the later as I know most wreckers here in AU do not send out engines with any bolt ons whatsoever, so there is a very good chance this is the original valve from my car.


When I took everything off to clean it, it wasn't very plugged, I would guess the cooler, egr valve and pipe got cleaned when the engine was installed 3 years ago

Trying to think how could I measure my rotors endplay, all I have is a set of digital calipers which doesn't really work, but I will say from eye it would be very similar, a tad less or around about 1mm ..

Here is a picture of my dimple, or whatever it's called.. btw no I don't normally get around posting pics of my dimple on the interwebs






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i was quite gentle with it, only screwed it down until i noticed slight resistance to suggest it was at its lowest point, definitely did not push the point or wrench it down, i have to think because my system was never plugged to begin with, this was actually the reason for my P0401 all along, i did not take my egr system apart to clean it for no reason, i got P0401 but when i took everything apart to clean was surprised to see it not that dirty

they work, just not really the best tool for the job but i will try when i get near the car later tonight or tomorrow

Mendel here in AU we use calipers for measuring brake rotors, i actually figured that would be world standard?

Trying to get a few pictures of the inner thread in this rotor, it looks cone shaped to me and kind of flat threaded /flogged at the top, struggle to get a decent photo with this $100 phone (yeah im cheap) and im no photographer, that's for sure lol

 

Also noticed there is probably nearly 1mm freeplay where the top bearing seats on rotor, could pack a shim under it to force rotor down near 1mm


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no mate lol, i only purchased the car 11 months ago, i had the opportunity to buy it about 2 years ago from the original fleet owner but i didn't buy it at that stage, then the exact same car was for sale again last year with a bad hybrid battery for half the price it was the year earlier so i snapped it up straight away

 

well, maybe.. this is all speculation but i doubt they would have taken the valve apart, more likely they would clean the cooler quickly and throw it back on new engine.. not really sure though.

BTW honestly If i thought i had made a mistake or wrenched it down too hard, i would admit .. im not at all precious like that, im not a mechanic just familiar with basic jobs and tools and do my best where i can

The service manager that i know from the original fleet and quite often speak with services so many cars and changes so many engines its impossible for him to remember the exact details of the job,hes always under the pump! told me it had an engine swap at 370k and they rarely get any accessories with engines,..

when i first took it apart and seen the cooler gasket misfit at the exhaust manifold that to me verified either the engine had been out or the cooler had been cleaned, or both..

did you happen to notice the pictures i most recently posted of the thread in rotor, tried to focus on the top portion of thread but its just near impossible

 

Why thanks Mendel, i am only using a cheap Umidigi A7 phone lol, it cost like $106 does the job think its like a 16mp camera, 4gb ram /64 storage / android 10 . i do not buy expensive phones as A: im cheap - B: quite often drop it

 

Correct ChapmanF. just cleaned inside the rotor threads with some alcohol and what originally looked like flat or flogged thread was only grease, that top portion of the rotor is actually supposed to be flat, there is only three maybe four winds of thread in there total and they visually seem okay so i just don't know what to think

also the groove in plastic stop on rotor does not match with the width of the metal stop on the valve, the grove in plastic stop is only maybe half as wide as the metal stop! if the metal stop caused this grove which i can only presume it did, it must have been contacting on one edge of the metal stop and not the full surface, if you get my lingo

 

when you say nib are you referring to the plastic stop piece inside rotor, sorry i don't even know what to call these nibs and knobs lol

 

Slightly better shot inside of rotor, after cleaning..

Strange it's only got that little scrape through the centre of plastic nib when the two contact points are very similar sizes to each other



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