*** Restricting New Posts to SD Premium Members ONLY *** (09 May 2025)

Just made a new account? Can't post? Click above.

Help us help you. By posting the year, make, model and engine near the beginning of your help request, followed by the symptoms (no start, high idle, misfire etc.) Along with any prevalent Diagnostic Trouble Codes, aka DTCs, other forum members will be able to help you get to a solution more quickly and easily!

In-cylinder help needed

  • GeorG
  • GeorG's Avatar Topic Author
  • Offline
  • Senior Member
  • Senior Member
More
9 years 2 weeks ago #1594 by GeorG
In-cylinder help needed was created by GeorG
2005 Nissan X-trail 2.5 lts. (Latin America Colombia) with cylinder 1 and 4 misfiring that had good spark, good fuel pressure and good relative compression. So I ran the car with an In-Cylinder pressure transducer on one cylinder at a time and noticed ode things at all cylinders, but specially in the misfiring No. 1 and 2 cylinders. Since I'm no good on the in-cylinder stuff, I tough I post here and start a discussion. :)







Attachments:

Please Log in or Create an account to join the conversation.

More
9 years 2 weeks ago #1595 by Andy.MacFadyen
Replied by Andy.MacFadyen on topic In-cylinder help needed
I throw some in possible theories.

(1) Valve seat recession changing the valve clearance and timing on the misfiring cylinders ?
(2) Cam lobe manufacturing tolerances ?
(3) Misfire effecting crankshaft angular velocity differently ?
(4) Misfire effect on exhaust manifold pressure ?
" We're trying to plug a hole in the universe, what are you doing ?. "
(Walter Bishop Fringe TV show)

Please Log in or Create an account to join the conversation.

Time to create page: 0.305 seconds