As the title does it benefit a 1.8 mk2.5 or not read plenty of contravening info on the subject and it seems as though I’m damned if I do and damned if I don’t, also debatable is whether a blanking plate throws up a fault light
Would it not also need remapped so that it doesn’t through up a fault ?
Personally I feel that if you blank it you’re modifying the engine & why didn’t Mazda do that as an original spec ?
Technically no because reading up suggests that the only reason for an egr valve is to reburn exhaust gasses therefore lowering emissions but they can restrict performance and affect mpg when at cruising speeds that is if you believe what you read
So if you blank it then are you not running a risk of MOT failure on emissions ?
As far as i Can see no it mainly operates when the engine is cold or under full load which don’t occur at mot’s however if u remove the egr completely and the tester has a Keen eye and spots that it’s missing he can fail it on the fact it’s not there! Hence why I’m asking about blanking it as a search on fleabay throws up quite a few blanking plates for sale, other vehicles pass mot’s with a blank in fact my previous car I totally removed it but it was a diesel so no problems with the emissions on that
It should be shut when cold, idling and under full load. It should open an appropriate amount during driving that would otherwise raise the temperatures in the combustion chamber high enough to produce NOx, hence the stepping motor for fine control.
The non-combustible gases lower the peak combustion temperature and amongst other things can help prevent pinking.
It seems that if the EGR is working correctly it should generally help the engine! See the Wiki article and read it with the normal caveats about the accuracy of anything on the wiki, and make your own judgement.
When the performance gains for something are debatable, I tend not to do it.
The EGR delete is a little different as it also allows you to declutter your bay a bit - I’d do it for that!