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In-cylinder help needed

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7 years 8 months 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. :)







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7 years 8 months 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)

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