Question about 1998 Pontiac Grand Am

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How to set top dead center on 98 grand am 2.4liter

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Remove the number one spark plug. Put a gauge in the hole. Top dead center is on the compression stroke when the piston reaches the top of the stroke. When you see the gauge begin to move, remove it and put a straight piece of wire in the hole. Turn the crankshaft clockwise by hand/wrench till the wire comes up and then starts to go down. When it goes down, you just passed TDC. Back it up a bit until you are comfortable with it being at TDC.

Posted on Nov 15, 2014

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There is a mark or notch on the distributor housing that the rotor should be pointing to when the engine is on top dead center. This "static" timing is all that matters and the computer will be able to control the timing as long as the ignition rotor is in that position when the engine is at top dead center.

1. Place the engine at top dead center.

2. Look under the distributor cap and find where the number one terminal runs under the distributor cap, and where that position on the distributor cap corresponds with the distributor housing, and it should match up to a mark or a notch on the distributor housing indicating the number one position.

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Here is a firing order diagram to also help assist you.


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