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Where is the ecm located and how do I replace it or have it tested

(1990 Buick Century)
in Canton, PA on March 16, 2015
I have replaced and tested every other electrical part in my 90 Buick Century. But for some reason I don't get any spark from the motor. I am very confused and don't know what to do next. I really need help to figure out what is wrong with my car it is the only vehicle that I have so please help.
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Popular Answer
on June 20, 2015
It is under your coils where all the spark plugs come to one place. I believe this is the right front of your engine. Before you replace that, check to make sure you have power at your camshaft and crankshaft sensors. It is in my opinion that your timing chain is the problem. Take your oil cap off and manually turn the engine and see if there is any movement from the rocker arms. The ignition switch can also cause this problem. Maken sure the key is off and battery disconnected before you turn the engine.
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