Intermittent Power Loss

[atw257]

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.