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If a valve does not close completely will that keep engine from starting

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It would really depend on the amount of cylinders you have and how far it stays open. Say it's a 4 cylinder engine with the valve staying open quite a bit. That WOULD cause you to lose a lot of compression. If you have say a 6 or 8 cylunder, you may have a poor running and missing engine but the compression would most likely be made up with the other cylinders. This isn't a for sure thing as different engines require different amounts of compression in order to run but hoping you get the concept of what I am trying to say. Hope this helps....

Posted on Nov 01, 2012


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96 sonoma running too rich with p1406 code

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After removing the EGR valve, clean the pintle seat area of the valve and the corresponding passageway in the engine.

or simply replace the EGR valve.

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Does valves have to be closed when engine is at tdc on 2002 mitsubishi eclipse 2.4

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Cycle 1: Intake valve is open and piston is travelling DOWN. (Intake)
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In case this wont be it, then it could be a problem with the cold start valve, which is a electrically activated valve. The problem might be that this valve does not close completely and leaks extra fuel in the intakes which than would influence the idle. You wont feel it driving, other than good pickup and lower gas mileage.

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My 2004 Grand Prix GTP starts right away when cold, but once it's warmed up it's hard starting. It will just crank and crank until you give it some gas. What is wrong and how can I fix this problem?...

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Carefully remove the valve from the throttle body, paying close attention to where the rubber o-ring may come out with the valve or it may stay seated to the valve mounting hole. Either way...don't lose it.

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