Can I run with a bad o2 sensor tomorrow? - Miata Turbo Forum - Boost cars, acquire cats.

Welcome to Miataturbo.net   Members
 


MEGAsquirt A place to collectively sort out this megasquirt gizmo

Reply
 
 
 
LinkBack Thread Tools
Old 03-31-2012, 04:06 AM   #1
Supporting Vendor
Thread Starter
iTrader: (3)
 
Join Date: Jul 2006
Location: San Diego
Posts: 2,862
Total Cats: 484
Default Can I run with a bad o2 sensor tomorrow?

So at the track this last weekend I damaged an exhaust hanger and I had to drive it home 175 miles with the exhaust hanging out of the bottom of the car. Half way home, one of the bolts at a flange in the exhaust backed out so there was a big exhaust leak right next to the o2 sensor and the AEM UEGO just went to a solid 14.8:1. I assumed this was because the o2 sensor was reading atmospheric air since there was a big gap in the exhaust about 3" from the sensor.

I just got the exhaust fixed today, and the sensor is still reading a flat 14.8:1 - the problem I've got now is there's an autocross tomorrow morning.

First of all, what does this mean, is my o2 sensor dead and do I have to replace it?

Second, my tune is good, so can I run the car even if the o2 sensor bit the bullet or is the megasquirt in some kind of failsafe mode when it isn't getting a proper o2 reading?

Thanks guys
-Ryan
ThePass is offline   Reply With Quote
Old 03-31-2012, 04:13 AM   #2
I'm Miserable!
 
Join Date: Jun 2009
Location: albany, ga
Posts: 1,869
Total Cats: 3
Default

if your tune is good and o2 correction doing minimal correction under cruise you should be fine, provided you have a good tune.
I take it you weren't doing closed loop under boost so you probably have that tuned in well.
Also disable closed loop operation
Techsalvager is offline   Reply With Quote
Old 03-31-2012, 04:19 AM   #3
Supporting Vendor
iTrader: (31)
 
Savington's Avatar
 
Join Date: Nov 2006
Location: Sunnyvale, CA
Posts: 14,353
Total Cats: 1,319
Default

Shut off all your closed-loop O2 corrections and go for it.
Savington is offline   Reply With Quote
Old 03-31-2012, 02:39 PM   #4
Cpt. Slow
iTrader: (25)
 
curly's Avatar
 
Join Date: Oct 2005
Location: Oregon City, OR
Posts: 12,105
Total Cats: 518
Default

It's technically only a warning light at that point, so you will be loosing that safety part of it. In case anything breaks in your fueling, you won't know. I'd be more comfortable with it at an autox over a track day. Just get it fixed after this one.
curly is offline   Reply With Quote
Old 03-31-2012, 03:02 PM   #5
Tour de Franzia
iTrader: (6)
 
hustler's Avatar
 
Join Date: Jun 2006
Location: Republic of Dallas
Posts: 29,114
Total Cats: 351
Default

I'd run it at the track, hard.
hustler is offline   Reply With Quote
Old 04-01-2012, 04:00 AM   #6
Supporting Vendor
Thread Starter
iTrader: (3)
 
Join Date: Jul 2006
Location: San Diego
Posts: 2,862
Total Cats: 484
Default

I did as you advised. Car didn't blow up. 1st in class and TTOD. Thanks guys!

-Ryan
ThePass is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
MSPNPPro-MM0105: Coolant Temperature Output slomiata MEGAsquirt 5 10-07-2015 02:11 PM
Back to Stock Part Out!! Turbo Parts, MS2 Enhanced 01-05, Suspension, and MOAR! StratoBlue1109 Miata parts for sale/trade 16 10-02-2015 10:39 AM
Got bad Crank Angle Sensor and Random Misfire codes, but runs fine. Greasyman General Miata Chat 2 09-28-2015 11:44 AM
ME221 Now has Autotune and Long Term Fuel Trim Tables Motorsport-Electronics ECUs and Tuning 0 09-05-2015 09:02 AM


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 12:02 AM.