Rattle can experience - LotusTalk - The Lotus Cars Community

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post #1 of 5 (permalink) Old 05-17-2017, 02:22 PM Thread Starter
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Rattle can experience

Thought I'd share a bit of an (unnecessary) scare I had with my exige. Started getting noise at certain rpm, primarily between 4000-5000. It definitely sounded like a rattle can so immediately became paranoid I was experiencing something potentially serious. Put the car on the lift and took off the diffuser and undertray. Inspected the exhaust and everything else I could check - all looked in tact. Found a few spots where the heat shield could have been making noise and adjusted. Decided to drive the car for a bit without the diffuser and undertray and voila, no more rattle can, all quiet. Also noted I'd lost a few fasteners on the undertray so suspect that was a contributor. Figure I'll add some washers as well (nylon or rubber) to minimize vibrations. I only share this because the sound was nasty and I immediately expected the worst, but thankfully I was wrong and just being paranoid.


If you get a nasty rattle don't be like me and immediately jump to the nastiest thing you can think of. Take your time, pull the trays, have a good look around, check the exhaust, heat shield, bolts, fasteners, washers, etc. and then take a quick spin without the trays. If it turns out that's the cause it definitely improves your day.
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post #2 of 5 (permalink) Old 05-17-2017, 04:43 PM
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@ebg338 - Same thing happened to me. I had just replaced the undertrays after an oil change. Driving down the road, I could hear a rattle that sounded like gravel in a beer can. We pulled off in a parking lot and after banging things with my hand, discovered I had forgotten to tighten the two big bolts on the rear diffuser. Those are buried under the trailing edge of the middle underbody tray, so it took a few minutes to get access and tighten everything. It is a relief to confirm your engine bits aren't grinding themselves into little shavings.


CO 2011 Lotus Elise SC
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post #3 of 5 (permalink) Old 05-17-2017, 05:31 PM
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I routinely tap all of my undertrays, skirts, and diffuser with my knuckle. It's a quick test, and has helped me hear exactly where rattles are coming from. Reminds me, my front undertray has a bolt loosening

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post #4 of 5 (permalink) Old 05-17-2017, 06:25 PM
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@ebg338 , I recognize your car from your profile pic. I remember looking at that exact pic, talking to the dealer about potentially buying it. It looked super clean from what I recall. In the end, I couldn't get them down to where I needed to be, but thought it was funny when I saw your picture.
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post #5 of 5 (permalink) Old 05-18-2017, 08:03 AM Thread Starter
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Hi Verichai,

They were pretty firm, got them down just a bit. After driving it though I had to buy it. Perfect condition - I added a fastworks tune from BOE that made it even better. Car's been a blast to drive. Did you end up picking one up?
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