hello yourmechanic, I have a starting problem with my old JETTA Mk3- it cranks but wont start. I checked for spark at the end of the sparkplug wire and i don't have spark, so i replaced ignition coil and i still have no spark. could it be the starter? or could it be the crankshaft sensor?
thank you in advance for your feedback,
My car has a manual transmission.
The starter will not have any impact on the engine’s ability to produce spark. There are a number of issues that may cause an ignition system to not produce spark.
A bad crankshaft position (CKP) sensor (on engines that do not have a distributor), or broken, loose or corroded wires from the sensor to the PCM. A bad ignition module (on engines that have a distributor or use an ignition module separate from the PCM) A bad pickup inside the distributor (on engines that have a distributor), a stripped distributor drive gear (common problem with plastic distributor drive gears), broken, loose or corroded wires from the pickup to the ignition module or PCM. A bad ignition coil (on engines that have a distributor and a single coil) A bad rotor or distributor cap (cracks or carbon tracks that are allowing the spark to short to ground) A faulty ignition switch.
Any of the above issues may contribute to a lack of spark problem and should be looked at by a qualified mechanic such as one from YourMechanic. I would suggest having one of our professionals come to your location to diagnose and inspect your spark problem.
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