Intermittent moaning/ howling noises coming from car - LotusTalk - The Lotus Cars Community
 
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post #1 of 13 (permalink) Old 01-09-2013, 03:10 PM Thread Starter
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Intermittent moaning/ howling noises coming from car

I'm getting these intermittent moaning/ howling noises from my exige s240. It can get so loud that it drowns out the radio but then suddenly goes away. Earlier on I thought it was coming from the front of the car now it's coming from behind in the engine bay? It has happened while idling, coasting, braking, and accelerating. (Not too sure on the last one since the exhaust is so loud.) I think the only consistent thing is that the car is warmed up when it happens. I'd describe the noise as the noise plumbing makes when there is air inside. Anyone else ever have this issue?
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post #2 of 13 (permalink) Old 01-09-2013, 03:44 PM
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post #3 of 13 (permalink) Old 01-09-2013, 08:59 PM Thread Starter
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hahah I kind of wish it was... would be a lot easier to diagnose
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post #4 of 13 (permalink) Old 01-10-2013, 09:19 AM
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Originally Posted by Stale_Hotdog View Post
I'm getting these intermittent moaning/ howling noises from my exige s240. It can get so loud that it drowns out the radio but then suddenly goes away. Earlier on I thought it was coming from the front of the car now it's coming from behind in the engine bay? It has happened while idling, coasting, braking, and accelerating. (Not too sure on the last one since the exhaust is so loud.) I think the only consistent thing is that the car is warmed up when it happens. I'd describe the noise as the noise plumbing makes when there is air inside. Anyone else ever have this issue?
1. Your car may need an exorcism.

2. Does the noise change with engine or road speed?

3. Have you opened the hood and listened from where it might be?

4. Warm it up, look around, listen. How is the belt?

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post #5 of 13 (permalink) Old 01-10-2013, 09:20 AM
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Grab the SC intake/thottle body while it's idling and push/pull on it. Does it cause the sound at least in some fashion? I've heard howling from a car that had SC mounting studs broken on it pushing/pulling on the throttle body would lift SC enough to cause the beginnings of the same resonance/howling that you'd get when on the throttle and it starts building some boost sufficient to lift it off.

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post #6 of 13 (permalink) Old 01-10-2013, 09:39 AM Thread Starter
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The only problem is that by the time I pull over and get out of the car to look track down the sound it has already disappeared. I'll give the SC a look over but it doesn't make that noise on boost. And the belt slipping i'm not so sure about since the noise used to generate from the front of the car drivers side. Can a coolant leak or air in the cooling system cause this noise? I've noticed some coolant loss recently.
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post #7 of 13 (permalink) Old 01-10-2013, 09:51 AM
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Originally Posted by Stale_Hotdog View Post
I think the only consistent thing is that the car is warmed up when it happens.
May be the fan? When are you going to stop by? I'll sit with you and check for the problem. 2 people always better than 1
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post #8 of 13 (permalink) Old 01-10-2013, 11:41 AM
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Got the same problem with my '99 Civic. Especially when the car is just starting to warm up well, it emanates a low-toned howling whistle from somewhere forward of the firewall that will come and go - no vibration, no grinding, not directly linked to RPM, gears, rolling speed, or throttle, although changes in throttle or gears can slowly make it come and go... Just weird.

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post #9 of 13 (permalink) Old 01-16-2013, 03:40 PM Thread Starter
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New tidbit I can at times feel the vibrations of the noise through my steering wheel. Also one time I could modulate the noise on and off for a few seconds with the brakes at really low parking lot speeds pulling into a parking spot.
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post #10 of 13 (permalink) Old 01-17-2013, 08:44 AM
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What pads do you have? If you have aggressive aftermarket ones, could the pads be catching on the rotor at a certain speed/angle and causing "brake moan?"

Or it could be coming from the brake booster/master cylinder...did you recently do any brake bleeding on the car?

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post #11 of 13 (permalink) Old 01-17-2013, 09:17 AM
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post #12 of 13 (permalink) Old 01-17-2013, 01:40 PM Thread Starter
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Running the factory Pagid rs-14's stock bbk ap calipers. Good idea, im going to inspect them again. I've flushed and bled the brakes about 6 months ago. Fluid is still clear. I used to suspect it was the brake master cylinder since the noise was coming from the drivers side. But i've never heard a brake master cylinder make noise before.

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What pads do you have? If you have aggressive aftermarket ones, could the pads be catching on the rotor at a certain speed/angle and causing "brake moan?"

Or it could be coming from the brake booster/master cylinder...did you recently do any brake bleeding on the car?
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post #13 of 13 (permalink) Old 01-17-2013, 05:35 PM
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I had a similar noise coming from passenger rear. It turned out to be brake pad rattle. I put the orange stop squeal behind the pads and no more rattles, grinds, or squeals.

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