We may receive a commission on purchases made from links. DIY car engine maintenance is hardly rocket science, but simple tasks can become unexpectedly difficult and seriously disrupt your routine. It ...

So, it's time for new spark plugs. Your hands are covered in grease, you're twisting the ratchet, and –- snap. Half the spark plug stays lodged inside your cylinder head like a nonpaying tenant who ...

For hot rodders, spark plugs are often nothing more than inspection tools that reveal whether an engine is running too rich, too lean, or just right. Street guys look for a nice tannish-brown tint on ...