2016 C300. It usually takes 4/5 attempts of trying to start it up before it turns over. Every attempt it basically gains more power to start and I know it’s going to start once it bounces back. Battery voltage showing fine, starter fine, alternator fine. Where to start with basic mechanical knowledge ?
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Turn the key from off to on without cranking it.(all the lights come on the cluster) wait in the on position for 3 or 4 sec. Then start it. If it starts first try you have a fuel issue.
I will try this and lyk !