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Top Dead Center. A mark on the engines crankshaft to denote the position of number 1 cylinder when its at the absolute top of its stroke. Unless you moved the location of the distributor then the timing should not have changed. Look at the link below. Copy & paste into your browser. It shows you the proper way to connect the plug wires. Also check to make sure you installed the rotor correctly and it is fully seated. There is a notch that the rotor will fall into when it is correct. Make sure the distributor cap is on correctly and locked down. It also has a notch that shows it is on correctly. It may be 180 degrees off. Make sure no wires came off and that the coil wire is installed fully into the distributor cap and the coil. If you did move the distributor location, then you are going to have to get it back close enough to start and then have it timed. To do that remove all the spark plugs and turn the engine over by hand until the #1 plug which is located, drivers side front of engine, is at TDC on the compression stroke. Put your thumb over the #1 plug hole and when you feel it push against your thumb, that is the compression stroke. Place a screwdriver inside the hole against the top of the piston and slowly by hand turn the engine until it is as far up as it will go. This is TDC. Now see if the rotor is pointing to the #1 plug wire location on the distributor cap. If not move the distributor until it is. The engine should start and you will need to take it to a professional and have the timing set. If none of this helps it may be time to call in a pro.

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โˆ™ 2006-04-20 15:28:44
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Q: What does tdc mean when answered no spark after changing plugs and wires and rotor and distributor cap?
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