# diagnose this problem please

**URL:** <https://forums.speedlife.net/t/diagnose-this-problem-please/134645>\
**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:** 8

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**Author:** ![blitz](https://avatars.discourse-cdn.com/v4/letter/b/bbe5ce/32.png) [@blitz](https://forums.speedlife.net/u/blitz)\
**Post date:** [October 24, 2007, 7:49pm UTC](https://forums.speedlife.net/t/diagnose-this-problem-please/134645/8 "2007-10-24T19:49:41Z")

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> [@Googled my first name...](https://forums.speedlife.net/t/googled-my-first-name/2366/30):
>
> 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.

S12 has detonation sensor. Will check that one also.

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