whats the point...egr delete?

[zswap0429]

So i see allot of people doing egr deletes. But i live in an emmissions required county, so i dont get to do that till i move... but what exactly does the egr do for your car and how does it benifit to get rid of it?

[nissanfreak12]

EGR=Exhaust Gas Re-circulation, takes the exhaust and recirculates it back into the engine so it will burn any unburnt fuel left to create a better emission. It only does a small portion, not all of it the cats take care of most of it. Most manufactures deleted the system due to it didn't work as much as they thought it would. That is when most vehicles came with pre-cats or introduced OBDII.

The reason most people delete the system is it really doesn't work after 20+ years of built up gunk and crap in the system. If you take yours off, I will bet you have carbon build up in the tubes and nothing i getting through that. All its doing now is directing all of it into the exhaust system. Another reason is it ends up being a major source to a vacuum leak. All the EGR valve is, is a rubber diaphragm. They usually fail after 10-15 yrs or after 100k miles. They don't make parts for it anymore or if they do it is insanely expensive. When a tech is looking for it, he will never find it, because of where it is located. I have known a lot of people pass emissions in phoenix, AZ. They have a very strict emission law there, not as bad as CA, but still tough. Hope this answers your question.

[t.mcginley.jr]

Read this article, it explains most of what you want to know:

http://s95014253.onlinehome.us/63104/197828.html

Btw, the EGR valve is only operational in certain conditions (as stated in that article), mainly when your cruising at a steady speed. It doesn't operate at idle, under full acceleration, when the engine is cold, or when the engine is excessively hot.

I live in NJ where we have emissions testing and I also deleted my EGR system. I haven't passed the idle emission test yet (for other reasons) but I do pass the high idle (2000 rpm for 1 minute) test with no problems.

[zswap0429]

Thanks to both of you... And this finally explains my vacuum leak. And my failed emissions

[Shoey2]

how long have you been chasing the leak?

[zswap0429]

A while now.probably the last 10000 miles worth of driving it.

[nissanfreak12]

Have you tried a boost leak test? You can always just buy the block off plate for the plenum and run that to see if your leak disappears.

[zswap0429]

No. havent really had the time to try anything. With this deployment and all