# diagnose this problem please **URL:** \ **Category:** Canada Nissan Automotive\ **Created:** [October 23, 2007, 9:00pm UTC](https://forums.speedlife.net/t/diagnose-this-problem-please/134645 "2007-10-23T21:00:54Z")\ **Posts on this page:** 1\ **Showing post:** 7
**Author:** ![pcproa](https://avatars.discourse-cdn.com/v4/letter/p/c5a1d2/32.png) [@pcproa](https://forums.speedlife.net/u/pcproa)\ **Post date:** [October 24, 2007, 5:23pm UTC](https://forums.speedlife.net/t/diagnose-this-problem-please/134645/7 "2007-10-24T17:23:25Z")
> [@Firehawk\>\>\>SkrappaR](https://forums.speedlife.net/t/firehawk-skrappar/2373/15): > > Exhaust should not affect anything on a turbo car unless its too small. But i’m still leaning towards you having a vacuum problem Backpressure on a turbo’d car does mean something, especially depending on how far down the exhaust from the turbo your exhaust wastegate gets its feed from, but that’s a separate discussion. Like I said before, this is the least likely of the options. My car produced similar problems a couple months ago. It turned out my Detonation sensor was on its way out. I would suggest it here but there’s no Detonation sensor on the S12. I fixed it in an hour with the Detonation sensor off of Alex’s last RB motor. --- _[View the full topic](https://forums.speedlife.net/t/diagnose-this-problem-please/134645)._