Muffler delete equals Rich condition

edub370 · 07-23-2012, 09:19 PM

how can a muffler delete possibly cause a rich condition? it must be something else that has caused this. allowing air to more easily flow out of your cylinders cannot cause a rich condition.

someone else chime in if im missing something here

cavemancan · 07-23-2012, 09:27 PM

I was confused about that one as well so let me add to the story:

When I originally picked up the car (used) I got a check engine light a few days later. Nissan (its still has factory warrantee) indicated that the car was "flashed tuned" by the previous owner. They went ahead and reflashed the ECU with the stock tune (so they say) and the check engine light went away.

I am not sure but could it be that after market tune is still hanging around causing some drama? The only thing is it was reflashed a long time ago. Why would it all of a sudden happen now after thousands of miles driven. In my opinion the exhaust is the most likely suspect.

IDZRVIT · 07-24-2012, 05:39 PM

Quote:

Originally Posted by edub370

how can a muffler delete possibly cause a rich condition? it must be something else that has caused this. allowing air to more easily flow out of your cylinders cannot cause a rich condition.

someone else chime in if im missing something here

Muffler delete and air intake filter delete won't cause this. Bad O2 sensor sounds more probable or some other problem causing the fuel management system to dump more fuel through the injectors than is actually required.

cavemancan · 07-24-2012, 07:01 PM

Quote:

Originally Posted by IDZRVIT

Muffler delete and air intake filter delete won't cause this. Bad O2 sensor sounds more probable or some other problem causing the fuel management system to dump more fuel through the injectors than is actually required.

Right but a bad O2 censor would throw a code correct? Which in turn would trigger the CEL. Since Nissan reflashed the ECU I doubt I have a phantom flash so I am at a loss.

IDZRVIT · 07-25-2012, 10:27 PM

Quote:

Originally Posted by cavemancan

Right but a bad O2 censor would throw a code correct? Which in turn would trigger the CEL. Since Nissan reflashed the ECU I doubt I have a phantom flash so I am at a loss.

Yes, in an ideal world a code would be triggered. Welcome to reality.

07-23-2012, 09:19 PM	#1 (permalink)
edub370 A True Z Fanatic Join Date: May 2011 Location: KCMO Posts: 3,458 Drives: 09 370z S/T 6MT Rep Power: 20	how can a muffler delete possibly cause a rich condition? it must be something else that has caused this. allowing air to more easily flow out of your cylinders cannot cause a rich condition. someone else chime in if im missing something here HumbleZ34 likes this. __________________ 09 370Z ST 6MT//Injen CAI//Greddy CBE//TP//TSW's//Swifts//Stillen lip//Whiteline sways 326whp/268tq

07-23-2012, 09:27 PM	#2 (permalink)
cavemancan Enthusiast Member Join Date: Mar 2012 Location: Miami Posts: 302 Drives: 09 370Z TourSport MT Rep Power: 249	I was confused about that one as well so let me add to the story: When I originally picked up the car (used) I got a check engine light a few days later. Nissan (its still has factory warrantee) indicated that the car was "flashed tuned" by the previous owner. They went ahead and reflashed the ECU with the stock tune (so they say) and the check engine light went away. I am not sure but could it be that after market tune is still hanging around causing some drama? The only thing is it was reflashed a long time ago. Why would it all of a sudden happen now after thousands of miles driven. In my opinion the exhaust is the most likely suspect. __________________ Mazda Rx8 MT Titanium - SOLD! 2009 370Z T-Sport MT Black - Takeda Intake, Swift springs, Rear Camber kit, SS B Lines, FI Exhaust, Z Speed CMAK Flywheel/Clutch Kit, Stillen Brake Cooling. Last edited by cavemancan; 07-23-2012 at 09:29 PM.

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