EGR Blockoff and CEL? - Miata Turbo Forum - Boost cars, acquire cats.

Welcome to Miataturbo.net   Members
 


General Miata Chat A place to talk about anything Miata

Reply
 
 
 
LinkBack Thread Tools
Old 02-22-2012, 07:42 PM   #1
Junior Member
Thread Starter
 
Join Date: Jan 2005
Location: Fort Worth, Texas
Posts: 242
Total Cats: -1
Default EGR Blockoff and CEL?

Will using a EGR blockoff plate cause a CEL?

can someone link me or explain what the ECM looks for from the EGR system?
edit, 2003
thanks.
fwMiata is offline   Reply With Quote
Old 02-22-2012, 07:51 PM   #2
Hittin' Boost & Cones
iTrader: (2)
 
240_to_miata's Avatar
 
Join Date: May 2007
Location: Cromwell, Connecticut
Posts: 2,572
Total Cats: 11
Default

at least on the NA's (96) it will cause a CEL. The ECU looks for a change in manifold pressure when the valve is open vs closed. This is why when I go to pass emissions I just vent the EGR to atmosphere on the intake side and leave the exhaust side plugged
240_to_miata is offline   Reply With Quote
Old 02-22-2012, 09:13 PM   #3
y8s
2 Props,3 Dildos,& 1 Cat
iTrader: (8)
 
y8s's Avatar
 
Join Date: Jun 2005
Location: Fake Virginia
Posts: 19,038
Total Cats: 407
Default

does your EGR system no longer exist and is no longer connected to the exhaust manifold?

keep it. run it. it's not bad.
y8s is offline   Reply With Quote
Old 02-22-2012, 09:28 PM   #4
Junior Member
Thread Starter
 
Join Date: Jan 2005
Location: Fort Worth, Texas
Posts: 242
Total Cats: -1
Default

Quote:
Originally Posted by y8s View Post
does your EGR system no longer exist and is no longer connected to the exhaust manifold?

keep it. run it. it's not bad.
new turbo manifod does not have EGR bung. i can get the fitting from begi and have someone weld it on but was trying to avoid it. im chasing a couple of faults at the moment. EGR not ready, EVAP not ready and Secondary O2 heater circuit not ready. NO cel, but need to pass OBD2 emissions...
fwMiata is offline   Reply With Quote
Old 02-22-2012, 09:37 PM   #5
Elite Member
iTrader: (4)
 
MartinezA92's Avatar
 
Join Date: Aug 2009
Location: Mountain View, CA
Posts: 1,702
Total Cats: 28
Default

"Not Ready" does not mean "fault". Evap monitors are notorious for taking forever to run, and only under very specific and usually annoying conditions. Just drive the car. A lot.

If you removed EGR, expect the EGR monitor to fail. Then you will have a CEL.

I'm not sure if Mazda does this but I know some cars will open EGR and look for a change in o2 signal and MAP at the same time, so any little change to the system might trigger the light.
MartinezA92 is offline   Reply With Quote
Old 02-22-2012, 10:04 PM   #6
Junior Member
Thread Starter
 
Join Date: Jan 2005
Location: Fort Worth, Texas
Posts: 242
Total Cats: -1
Default

Quote:
Originally Posted by MartinezA92 View Post
"Not Ready" does not mean "fault". Evap monitors are notorious for taking forever to run, and only under very specific and usually annoying conditions. Just drive the car. A lot.

If you removed EGR, expect the EGR monitor to fail. Then you will have a CEL.

I'm not sure if Mazda does this but I know some cars will open EGR and look for a change in o2 signal and MAP at the same time, so any little change to the system might trigger the light.

yeah, i know all that.... it has not reset in almost two years... im trying to avoid throwing parts at it.

I know some cars do that, but I need to know what the Miata does and what I have searched does not explain it. i have read that it has passages in the IM that it looks at and all kinds of other goofy stuff...
fwMiata is offline   Reply With Quote
Old 02-22-2012, 10:05 PM   #7
Hittin' Boost & Cones
iTrader: (2)
 
240_to_miata's Avatar
 
Join Date: May 2007
Location: Cromwell, Connecticut
Posts: 2,572
Total Cats: 11
Default

EGR needs to be ready before other readiness tests will clear. I made that mistake a few years back. I vented my EGR to atmosphere and all my ready tests cleared within a few miles.
240_to_miata is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Another Cast Manifold Corky Bell Prefabbed Turbo Kits 18 11-22-2016 10:01 PM
Got bad Crank Angle Sensor and Random Misfire codes, but runs fine. Greasyman General Miata Chat 2 09-28-2015 11:44 AM
WTB Begi cast manifold & t25 turbo Heyitsryan WTB 0 09-12-2015 09:47 PM
First to get it out of the way main Meet and Greet 2 09-05-2015 02:03 PM
First to get it out of the way main Meet and Greet 1 09-05-2015 01:39 PM


Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -4. The time now is 09:18 AM.