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Evo X General General discussion on the 2008+ Mitsubishi Lancer Evolution X

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Old 09-12-2018, 10:52 PM   #11
DavidEvoX13
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Wasn't a boost leak. I've also determined that it happens when off throttle, even at higher RPMs it's just more apparent above 2.5k. If I get to 5k RPMs and completely let off, the noise is still there and goes away below 2k.

At this point I'm starting to get concerned because I have no idea what it is. I've been told it could be my wastegate, or something with the intake and putting my air box back on but I really don't think it has anything to do with boost at all based off the whine is there when letting off throttle, any more ideas would be helpful.
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Old 09-13-2018, 12:15 AM   #12
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How are your fuel trims. I would check them at ldle and at around the RPM and load when you say it's loudest to see if they dramatically change
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Old 09-13-2018, 11:11 PM   #13
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Alternator whine? May be water pump or oil pump? Belt drive?
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Old 09-13-2018, 11:51 PM   #14
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Alternator whine? May be water pump or oil pump? Belt drive?
If its RPM dependent only and not load based, this is a good possibility. There is an issue with some of the OEM idler pulleys as well, the stock plastic one is known to cause problems. I can't recall if I've expressed this before.
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Old 09-14-2018, 08:13 PM   #15
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If its RPM dependent only and not load based, this is a good possibility. There is an issue with some of the OEM idler pulleys as well, the stock plastic one is known to cause problems. I can't recall if I've expressed this before.
Yes, I remember about those as well. Though my car is 2012 and still has stock belt since day one at 110k miles. I check it regularly, also have a spare one, but it keeps going without issues.
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Old 09-18-2018, 03:30 PM   #16
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Are you guys running the engine cover? That things masks a good bit of noise.



Mine makes a bit of whine when the engine bay gets heat soaked and no engine cover.
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Old 06-13-2019, 10:21 PM   #17
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Hi guys, cannot believe I've been dealing with this for so long.

So the problem is coming from the rockford fosgate radio, specifically right at the area where the time is displayed. I remove the fuse and the sound has gone away. However I want my radio, so I purchased a new rockford fosgate radio display in hopes this would fix the problem, and I have the same result.

The only thing I recently added prior to this issue was gauges (VLS) in the car, but the issue didn't pop up right away. I spoke with the guy who installed them and stated the gauges have nothing to do with it.

Does anyone have ideas on what can cause this and how to fix it?
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Old 06-18-2019, 11:28 PM   #18
turismolover22
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Hi guys, cannot believe I've been dealing with this for so long.

So the problem is coming from the rockford fosgate radio, specifically right at the area where the time is displayed. I remove the fuse and the sound has gone away. However I want my radio, so I purchased a new rockford fosgate radio display in hopes this would fix the problem, and I have the same result.

The only thing I recently added prior to this issue was gauges (VLS) in the car, but the issue didn't pop up right away. I spoke with the guy who installed them and stated the gauges have nothing to do with it.

Does anyone have ideas on what can cause this and how to fix it?
That whine is likely "ground loop interference" Often caused by power wires running parallel to audio wires, or electronics that transmit audio. It sounds like you need a power conditioner, or perhaps a shielded power and ground wire to the radio.

Is it at all possible to check wiring and see if the issue persists with the stereo in another car? It could also be an issue with the factory amp, so don't rule that out either. You could test that out by disconnecting the amp and keying the car on/starting it. Or pulling the amp fuse, relay etc.
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Old 06-19-2019, 03:45 AM   #19
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Quote:
Originally Posted by DavidEvoX13 View Post
Hi guys, cannot believe I've been dealing with this for so long.

So the problem is coming from the rockford fosgate radio, specifically right at the area where the time is displayed. I remove the fuse and the sound has gone away. However I want my radio, so I purchased a new rockford fosgate radio display in hopes this would fix the problem, and I have the same result.

The only thing I recently added prior to this issue was gauges (VLS) in the car, but the issue didn't pop up right away. I spoke with the guy who installed them and stated the gauges have nothing to do with it.

Does anyone have ideas on what can cause this and how to fix it?
That whine is likely "ground loop interference" Often caused by power wires running parallel to audio wires, or electronics that transmit audio. It sounds like you need a power conditioner, or perhaps a shielded power and ground wire to the radio.

Is it at all possible to check wiring and see if the issue persists with the stereo in another car? It could also be an issue with the factory amp, so don't rule that out either. You could test that out by disconnecting the amp and keying the car on/starting it. Or pulling the amp fuse, relay etc.
Yup, my stereo did this straight from the dealer. I never cared to fix it, but I knew the sound as soon as I heard it due to doing a crappy job installing and grounding a stereo in my first car. haha
Any idea what the guy grounded to and tapped for power on the gauges? Most people wire into the fuse box in the front driver side, but he could have done something funny behind the stereo in the center.
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