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Showing content with the highest reputation on 06/29/2023 in all areas
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Have you checked your mass airflow sensor? If its dirty then your ECM might think there is less air than actual causing a lean condition and ultimately a spark knock under load. Spark knock can sound VERY much like a heat shield rattling1 point
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Not making the noise when you rev it in neutral makes me think it's not a timing chain guide or an accessory bearing (they shouldn't know if it's in gear or not). When the cat honeycomb broke free on my friend's Chevy, we found it pretty quickly by smacking the exhaust from underneath and listening for the rattle. Sounds like you've ruled that out too. Start with the shields you know are loose. If you can't get a hose clamp around them, try baling wire. I think I still have baling wire wrapped around a loose U bolt on my exhaust. That one caused a rattle from the transmission area, but only at part throttle/moderate load, which had me much more worried than I should've been.1 point
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I know this is on a totally different vehicle but on my girlfriends 2000 maxima I had a similar sound that you’re describing and it ended up being an engine mount. Hopefully this might help you out some. Sent from my iPhone using Tapatalk1 point