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2006 Monte Carlo engine noise rattle pinging deisel sound
My 2006 Monte Carlo started making engine noise, sounds like a diesel engine when I accelerate.
Here are the details: 2006 Monte Carlo SS; 5.7L V8 with 86,000 miles
This week I brought it into a dealer to replace a failed throttle body and fuel pump. (car would not start) They replaced those and did an oil change.
The next day I notice a bothersome engine sound. Sounds like an engine rattle, a lot like a diesel engine. But it's not constant, only intermittent. I can only cause it to make the sounds sometimes. Only while driving, not in park or idle.
I've narrowed it down to this: While driving at about 40 mph, I let off accelerator and let coast to low RPM, then accelerate and the sound sometimes shows up. OR- If driving at about 40 mph and I almost floor the accelerator to reach 3000 or 4000 RPM, then the rattle/pinging sounds again.
I have never noticed this before, it just started the day after I left the service garage.
Also note: I always use 91 Octane (the highest I can get in Vegas) I have always used 5W30 oil, but NOW has 10W30 oil from the dealer.
I brought back to dealer, but they want me to show sound to a tech during a ride. Not tech was available, so I need to bring back whenever I can get a day off work, which will not be any day soon.
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Your car or truck engine can make a number of different kinds of sounds when it is shut off. The most common is a ticking or pinging sound from the catalytic converter because it is cooling down.
Remove your starter and have it checked. It sounds like the starter gears are grinding while you are trying to start your engine. Any auto parts store can test the starter.
I had the same problem! I crawled underneath the car and discovered that a heat shield on the exhaust header pipe was corroded and rattling against the exhaust pipe. (Before the muffler) I removed the portion and clamps and solved the problem. Give it a try.
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