EGR delete
#3
Cpt. Slow
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This thread is helpful.
https://www.miataturbo.net/engine-pe...-delete-37239/
Basically, if you're on the stock ECU, you wanna do what's pictured in your first photo, leaving the valve and all related vacuum stuff intact to keep check engine lights from turning on. I'm pretty sure this solved my CELs on the '94 I'm working on, however I haven't driven it much. Some have reported the need to add a valve cover breather filter onto a chopped off EGR pipe, so the EGR valve gets some fresh air.
With MS, chuck it all in the trash.
https://www.miataturbo.net/engine-pe...-delete-37239/
Basically, if you're on the stock ECU, you wanna do what's pictured in your first photo, leaving the valve and all related vacuum stuff intact to keep check engine lights from turning on. I'm pretty sure this solved my CELs on the '94 I'm working on, however I haven't driven it much. Some have reported the need to add a valve cover breather filter onto a chopped off EGR pipe, so the EGR valve gets some fresh air.
With MS, chuck it all in the trash.
#4
Cpt. Slow
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Join Date: Oct 2005
Location: Oregon City, OR
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Fairly certain this is wrong. The lower oval shaped flange from the EGR pipe visibly loops back to the lower port of the EGR valve. When cued by the 1990's Mazda engineer, it opens and allows exhaust into the intake. I could be wrong though. Otherwise you'd have an intake leak through the EGR pipe and exhaust.
#5
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Fairly certain this is wrong. The lower oval shaped flange from the EGR pipe visibly loops back to the lower port of the EGR valve. When cued by the 1990's Mazda engineer, it opens and allows exhaust into the intake. I could be wrong though. Otherwise you'd have an intake leak through the EGR pipe and exhaust.
#11
Somewhat related question: I'm in the middle of putting a 94-95 1.8 in my 91 and there's a vacuum switching valve on the intake manifold near the throttle body that my 1.6 doesn't have. Am I correct in assuming this is for the EGR and can be removed during an EGR delete?
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Zaphod
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10-26-2018 11:00 PM