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Starting issue, need help

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Maybe once out of ten starts I will turn the key and the car will not turn over for a few seconds. It seems that it is not going to turn over, there is no clicking or battery issue, it just sits there as if I wasn't turning the key, then it finally starts. Anyone have any ideas about this? Thanks!
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Had major issues with mine on this that got worse over just a few weeks. The terminals on the starter motor had corroded. They're right underneath the car and apparently the underbody covers don't do a really good job of protecting it. Take the terminals off and clean them to get a good connection, and check condition generally of wiring.

Confusingly, I had this in conjunction with a suspected battery draining issue, so I thought the battery was continually effed but it was in fact this problem with the starter motor, quite separate.
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