Posted by Goose on July 29, 2017 at 19:44:54 from (70.198.53.74):
I'm stumped. Yesterday, with my wife driving, we pulled up to our mailbox in her '07 Chrysler T&C. While I was reaching into the mailbox for the mail, it sounded like a motorcycle went past on the road. We both looked around and there was no motorcycle on the road. We realized the noise had come from the rear of the van.
It did it twice today, both times after we'd come off the open road and stopped with the engine idling. You'd swear someone was revving a big Harley behind the van. Again, it never lasted more than 5-10 seconds. My first thought was something loose and rattling in the muffler, but it was to steady a pulsing sound for that. The only other thing I can think of is an injector sticking and the exhaust stroke pushing raw gasoline into the exhaust system where it ignites. The pulsing sound is just about the right frequency for one cylinder of an idling engine.
I've been into vehicles since I was 12, and I swear I've never heard anything like it, even when I was in service management.
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