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Re: A cylinder 2 and 3 not firing

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francoisc27

05-11-2008 19:01:16




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ih560 said: (quoted from post at 20:14:55 05/11/08)
This is confusing trying to run this topic down, Why is everyone replying in the main forum instead of under this topic?


It's probably my fault I am new to this forum stuff and I have no idea what I am doing. I apologize if so.

Francois

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1fortyfanatic

05-11-2008 19:31:53




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 Re: A cylinder 2 and 3 not firing in reply to 658834, 05-11-2008 19:01:16  
Sorry, I don't know how better to explain my thoughts, except, if the valves are malfunctioning and in the open position on the compression stroke, you don't get compression.

Like I said, not likely, but possible.

Dave



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ih560

05-11-2008 20:18:16




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 Re: A cylinder 2 and 3 not firing in reply to 1fortyfanatic, 05-11-2008 19:31:53  
If the valves are not closing that either means you have poorly adjusted tappet gaps, burnt valves or carbon build up on them. None these are really the result of a manifold gasket.
And the weak point of the gasket is not between the exhaust and intake ports, that is actually their strong point. The bolts are in between these ports and most of the clamping force is here. It would be more likely that the gasket would leak from the top and bottom. Meaning that they would suck air on the intake and then it make the engine idle high, and he would have noticed this when he sprayed carb cleaner around the manifold.

And there is really now way if it could happen , but if exhaust gasses where somehow making there way over and into the intake port it would cause the engine to run rich and the plugs may appear a little wet when he took them out. But then engine runs just fine when you put a little exhaust gas back into the intake , as in the whole principle of EGR. Exhasut gasses are recirculated into the intake to lower combustion chamber temps in an effort to hold off detonation allows further timing advancement, equalling more power and better fuel economy.
If you look at your manifold on your 140 you will see what I am talking about when I say it is almost impossible for the manifold to leak exhaust gasses across the manifold gasket area.

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