My car will not start, it will crank but not turn over.
What is your question?
2 different mechanics state a security system or a timing chain.
Before this occured all lights would stay lit on dash, and it would slowly slow down and shut off.
Hello, if you experienced a mechanical failure causing a problem running in the first place, then I would lean against the security system premise. Sounds like something performance related. I would have a proper diagnostic test done to see if spark, air or fuel is compromised, then proceed as needed to diagnose your concern.
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