Pre-Ignition or Ping, it’s a rattle sound.

Summer time is here. Summer heat will place extra load on your engine. During the hot summer months it is advised to use top-tier gasoline. (91 octane) The engine systems in modern cars today do a great job to control timing, but sometimes it will still ping. Top tier gasoline most of the time will quiet the ping or rattle sound.

The engine knock sensor pictured above was causing a nasty ping on a Nissan Pathfinder. The sensor is located under the intake manifold, not easy to change. The one on the left is the new knock sensor. The sensor on the right was still working, but not correctly due to the broken outer plastic shell.

If you hear the ping sound, do not ignore it. Something could be wrong. An engine will also ping if it is over heating. If your car is 3 years old or older, inspecting your cooling system regularly is very important. Stop in at the shop if you have a ping or rattle condition. A prolonged ping condition can damage internal engine parts.

It’s all good under the hood. Anthony Xavier ASE Master Technician

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