If engine is hard to start cold or hot and engine light is OK.
Very common problem for this engine in Aurora 3.5 and Intrigue 3.5 is crankshaft position sensor. Which is located above and behind starter. Starter must be removed first.
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Answer
Lower right hand side of the engine just above the oil pan. Theres a single bolt that holds it in.
The crankshaft sensor is in the front of the engine.Above the starter.You will have to drop the starter.2 15mm bolts.Look up and there it will be.
depending on the year, I have a 2002 intrigue, it is located just above the starter, it needs to be removed to remove the crankshaft sensor, 15mm for starter and 10mm for sensor 1 bolt , not to difficult.
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Someone believes you should, "Take Your coolant tank off and the sensor is located under it. It's fairlly simple to replace once you find it."; You will find a sensor there but not the crankshaft sensor. On a 99 Intrigue with a 3.5L, the crankshaft position sensor is in the engine block just above and behind the starter. get under the car, remove the starter and you should find what you are looking for.
The crankshaft position sensor is located on the front of the engine. It is just to the left of the crankshaft pulley.
The engine won't start.
The sensor in the distributor is the crankshaft position sensor.
The crankshaft position sensor is located behind the timing cover and above the crankshaft gear. the timing belt my have to be removed to access the bolts on the sensor.
The crankshaft position sensor, on your 1992 Buick regal 3.1 liter, is located on the back of the engine. The crankshaft position sensor is on the inside of the engine cover.