Loud "Rattle" upon hard exceleration...
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Loud "Rattle" upon hard exceleration...
I am using the term "rattle" because that's what I think best suits the sound- there is also a slight vibration and a subtle grind maybe? Just an all around odd noise for a brief second... and its freakin me out a little. I never really pushed the engine hard before so I am not sure if this is something I should hear normally or not. Here is the situation: (I have an 04 AT )Say I am going 50mph stomp the gas hard and the engine revs up and sounds like its toy car or something really harsh and not smooth for a brief spurt then settles in and sounds fine again. This is the first and only noise I have ever heard come from the engine this way. It seems to be coming from right in front of the steering wheel~ I looked and don't see anything loose or not bolted down etc.... I am right at 49120 miles so if something is going and needs to be fixed now is the right time to get it in under warranty. As I type this out I think I am answering my own question about calling the dealer right away but I wanted to see if anyone else has had this happen to them before?
#2
Definitely have the dealer take a look at it before 50K miles so you can get it taken care of under warranty. Even if they can't isolate and/or fix it, at least they will have seen it under warranty and you have a leg to stand on once it potentially breaks for good when you are out of warranty.
#3
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I'd have the dealer check it out. I don't think it's anything major...perhaps your header, downpipe, cat, or heat shield is loose. (If I'm imagining your description correctly)
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Holy crap! How dumb- I can't believe I posted that spelled that way. Anyway, thanks for all those that responded. Yes, it happens when in D upon stomping the gas hard and lasts only a brief second or two. The last time it happened I was running on a flat highway and I was going about 50ish then went to pass someone. I ACCELERATED to about 80 and heard this growling vibration that really freaked me out. The intake thought does sound to be a good one and I will use that when going to the dealer as a starting point. Thanks again all and sorry for the misspelling. Man I feel really dumb now.
*** No, not down-shifting and I can make a sound clip if it would help?
*** No, not down-shifting and I can make a sound clip if it would help?
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I had a very tinny-metallic rattle sound happen upon acceleration after the engine warmed up... usually in the 2500-3500 rpm range. I brought it in twice, and the dealership finally found a loose heatshield part near the catalytic converter. He "clamped" it and now it's fixed. I'm at work, so I don't have the exact words the service guy used, but hopefully this helps somebody.
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