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Q:

hundail elantra,,,im lost ,,but not the first time on 2003 Hyundai Elantra

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
intermittent wont start ,,,has no check engine light when this occurs ,,,have replaced used ecm and new ignition switch in collumb
(1) Answer
(1) Comments
I would suspect either your cam shaft sensor or your crank shaft sensor, they both can do this on this engine. The symptom will be a long crank time before starting or the car will just crank and crank and not ever start. Also, in some cases these sensor can set codes, but will NOT illuminate the check engine light.
the check engine light will not come on in the dash when the key is in the on position,,,that is when the car wont start ,,,when the ck engine light is on the vehicle starts fine,,