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- Engine Performance (https://www.miataturbo.net/engine-performance-56/)

- - CEL for EGR Valve (https://www.miataturbo.net/engine-performance-56/cel-egr-valve-98374/)

Schmaltz20

Oct 21, 2018 08:29 PM

CEL for EGR Valve

Just want to know peoples thoughts on clearing this. I have a ‘99 mx-5 with a 5spd trans. Should I do an EGR delete (will it clear the CEL), clear the EGR valve, or replace it with a new one? What have you done or recommend? Thanks in advance!

Enzob007

Oct 22, 2018 01:01 AM

Deleting it may clear the CEL but it could cause the car to run lean at times and also polute more for no performance gain so :td:

HowPrayGame

Nov 5, 2018 09:13 PM

Blocking off the EGR will cause a permanent CEL, in addition to the negatives Enzob brought up. Fix it properly if you are keeping the car stock.

the.cheat

Dec 6, 2018 12:40 PM

I had this issue when I first got my NB, I tried cleaning the manifold/EGR stuff out but that didn't help. Rerouting the vacuum line like this thread finally took care of it.

https://forum.miata.net/vb/showthread.php?t=300174

y8s	Dec 7, 2018 09:36 AM

Replace the EGR and run it. It's good for fuel economy and doesn't really affect max power.

the.cheat

Dec 7, 2018 10:30 AM

Quote:

Originally Posted by y8s (Post 1513866)

Replace the EGR and run it. It's good for fuel economy and doesn't really affect max power.

EGR is expensive, vacuum hose is cheap. I never saw an impact on fuel economy with the vacuum reroute VS. the fuel econonomy I've gotten out of other 1.8 Miatas.

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