Nissan 370Z Forum - View Single Post

atw257 · 01-20-2017, 09:06 AM

This issue has been happening the past few days and has me worried. I haven't been able to find anything online specifically relating to what I'm seeing.

I first noticed it when I was driving on the highway a few days ago. I started to hear a strange noise from my exhaust. A louder than normal rumble. About 30 seconds later all the power on the car cut off and back on really fast. This happened 2 or 3 times in quick succession. Even though power seemed to cut out I didn't notice a change in rpm or acceleration. Car seemed to still be driving the same except for the momentarily loss of power.

I tried resetting the ECU and the car seemed to be fine for the next couple of days.

Today on my way to work I started to hear the loud rumble from my exhaust again while on the highway. I decided to try and down shift into 5th gear to see what happened. This caused the car to momentarily lose power again, but the exhaust noise went away. A few minutes later the noise started to come back and I down shifted as soon as I heard it an the noise went away without power cutting out this time, so I shifted back into 6th gear. A few minutes later I heard the exhaust noise again, so I let it go a little longer this time before I downshifted to 5th gear. This time the power cut out momentarily again.

All in all it seems that if I can downshift to 5th as soon as I hear the noise and then shift back into 6th I won't have the power loss. If I wait awhile after I start hearing the exhaust noise, whether I down shift or not, I will eventually lose power momentarily.

Any help would be greatly appreciated. My only thought at this time is it may be a faulty CAM position sensor or I need to have my ECU tuned. This did seem to just start happening after I put a new cat back exhaust system on from fast intentions. Not sure why the exhaust would cause these issues though.

2009 370z Nismo 6MT 75k miles.

01-20-2017, 09:06 AM	#1 (permalink)
atw257 Base Member Join Date: Mar 2012 Location: St. Peters, MO Posts: 17 Drives: 09 370Z Nismo MB M6 Rep Power: 13	Intermittent Power Loss This issue has been happening the past few days and has me worried. I haven't been able to find anything online specifically relating to what I'm seeing. I first noticed it when I was driving on the highway a few days ago. I started to hear a strange noise from my exhaust. A louder than normal rumble. About 30 seconds later all the power on the car cut off and back on really fast. This happened 2 or 3 times in quick succession. Even though power seemed to cut out I didn't notice a change in rpm or acceleration. Car seemed to still be driving the same except for the momentarily loss of power. I tried resetting the ECU and the car seemed to be fine for the next couple of days. Today on my way to work I started to hear the loud rumble from my exhaust again while on the highway. I decided to try and down shift into 5th gear to see what happened. This caused the car to momentarily lose power again, but the exhaust noise went away. A few minutes later the noise started to come back and I down shifted as soon as I heard it an the noise went away without power cutting out this time, so I shifted back into 6th gear. A few minutes later I heard the exhaust noise again, so I let it go a little longer this time before I downshifted to 5th gear. This time the power cut out momentarily again. All in all it seems that if I can downshift to 5th as soon as I hear the noise and then shift back into 6th I won't have the power loss. If I wait awhile after I start hearing the exhaust noise, whether I down shift or not, I will eventually lose power momentarily. Any help would be greatly appreciated. My only thought at this time is it may be a faulty CAM position sensor or I need to have my ECU tuned. This did seem to just start happening after I put a new cat back exhaust system on from fast intentions. Not sure why the exhaust would cause these issues though. 2009 370z Nismo 6MT 75k miles.