Will the engine turn over with the starter? What year model is the car?

If the starter motor spins the engine at what you remember to be normal speed, then it is most likely a glow plug issue as mentioned earlier. There are two types of glow plug systems, so that's why we need to know what year.

Best of luck with it and keep us informed. We can help you through this if you keep answering our questions.

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2001 SLK 320 six speed manual
2014 Porsche Cayenne six speed manual

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