Crankshaft sensor problems
Crankshaft sensor: Sensor that detects the engine spins. It synchronizes the spark of the spark plugs and the injection. It is placed in the steering wheel of the engine. It is also called "CKP sensor".
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Cranking but won't start 
Solved
Volkswagen Jetta 2002 102000 miles
I can start it by spraying starting fluid into the air intake.
I have replaced the Fuel pump, fuel injectors, Fuel Relay 409 (under the steering wheel), the ECM, and crankshaft sensor. Crank position sensor. I am now lost why this vehicle won't start.
I have replaced the Fuel pump, fuel injectors, Fuel Relay 409 (under the steering wheel), the ECM, and crankshaft sensor. Crank position sensor. I am now lost why this vehicle won't start.
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Best answer (according to Angel)
AN
The fuse box imagines on this website helped alot. Once I installed all the the parts. I noticed that the fuses on the side of the drivers panel were missing some so I checked this websites fuse diagram and noticed I didn't have one for the Fuel injectors. Once I added it car started right up.
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NI
Coil pack, had the same issue
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