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MCX nytro air fuel sensor location/failure????

SEVS11

Extreme
Joined
Feb 26, 2010
Messages
113
Location
Canada
I was out today the the first rip of the year and I noticed on my MCX display that my airfuel was very sporadic? It would flicker very fast from 15.7 to 14.9 at idle and once warmed up with a few passes down the field it never changed period. It just kept flickering back and fourth and it did not do this last year at all. I do run 100LL and I hear this can be hard on sensors so I am thinking the sensor is messed but still I am not sure cause I never seen this before.

I removed the seat and turbo cover etc...and I located a sensor with 5 wires connected to a sensor going into the exhaust right before muffler so I am assuming this is it? Can somebody shim in and confirm these couple questions before I order a new sensor from mcx. Thannks!
 

Remember seeing a youtube video of how to test those lambdas, but dont remember how. Was looking for AEM test when i did see it. Maby a few minutes of googeling/tubeing would be smart :smiley:

Do you have issues of "peaking" lambdavalues if you accelrate hard?
I dont have a lambda directly to my mcx system, but a AF gauge on my phazerturbo. It seems like the extra ecu uses to long to give extra gass, and i was wondering if others have the same issue.
 
Lite said:
Remember seeing a youtube video of how to test those lambdas, but dont remember how. Was looking for AEM test when i did see it. Maby a few minutes of googeling/tubeing would be smart :smiley:

Do you have issues of "peaking" lambdavalues if you accelrate hard?
I dont have a lambda directly to my mcx system, but a AF gauge on my phazerturbo. It seems like the extra ecu uses to long to give extra gass, and i was wondering if others have the same issue.

Here is the link: how to check your o2 sensor!
http://www.youtube.com/watch?v=1mb4VmDd0ao
 
changed the sensor with same result the gauge is just reading very sporadic like a stop watch and never getting below 14 as i can see since its so fast any suggestions???
 
Try the test, like in the video, then you will see how it react and if it react the way its supposed. This way you have excluded any possible engine issues.

Else i would suggest that you chek the whole wire harness, maby there is wear/damage at one place that gives you this problem.

Ar you running xenon? Some kits messes with mcx system
 


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