Question about 2002 Pontiac Aztek

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2002 aztek stalls after driving for a while - 2002 Pontiac Aztek

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Does it start back up right away ? If not check for spark at a spark plug . Do you know how to do that ? Hold plug wire end near ground and have a helper try to start the vehicle . If there is spark , check fuel pressure . Videos on youtube showing how to do these basic test's . After you find out what is missing , then it gets a little harder . Electrical testing the system that's the problem .All kind of good videos on youtube for trouble shooting ignition , fuel systems . Video's on basic automotive electrical testing . You also need to be aware of the complexity of the engine control systems . PCM/ECM - engine computers .Also serial data communication networks , in the case of your pontiac GM used Class 2 data bus for module communication network . A engine sensor starting to short out can cause problems like you are having also . Shorting out the 5 volt ref. voltage the engine computer sends out to the sensors on the engine. Like the TPS - throttle position sensor , MAP - manifold absolut pressure sensor , crankshaft position sensor , camshaft position sensor . There are a couple others , doesn't matter . Test for the 5 volts at the easiest place TPS . Less then 5 volts one of the other sensors is shorted . More then 5 volts shorted to vehicle battery power . Trouble shooting the modern computer controlled car is no piece of cake .

Posted on Dec 26, 2016

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