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Q: My tachometer gauge needle is pointing straight down, and it won't start.

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I replaced the fuel pump, cap and rotor. I'm getting spark to my cap, replaced the distributor, replaced relays, new fuel filter. It just stopped running one day and now it will turn over but won't start. I need help please someone tell me what's going on with it.

My car has 169000 miles.
My car has an automatic transmission.

Hi there. Check the crankshaft position sensor and see if there is power to the sensor. If there is power to the sensor, then put leads from a digital meter on the sensor and crank the engine over. Check to see if sensor if working with a voltage reference on and off. You can be getting voltage to the spark plugs, but it may not be enough. Also, check the three essensuals of the engine, air, spark, and fuel. The fuel pressure regulator could have failed causing the rail pressure to drop making the engine not start. Check the fuel rail for the pressure and see if there is a minimum of 35 psi. If the pressure is lower, then I recommend replacing the fuel pressure regulator. If you are still having trouble getting your engine started, then I recommend seeking out a professional, such as one from Your Mechanic, to help you.

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