Genesis coupe making "SHHHHHH" sound when I press on gas. - Hyundai Genesis Forum
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post #1 of 6 Old 01-09-2019 Thread Starter
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Unhappy Genesis coupe making "SHHHHHH" sound when I press on gas.

Hello is this my first forum but I am in need of help.

My car recently making the "SHHHHHH" sound that is very loud, which is causing my car to lose boost. I check everything, piping and retighten everything. I check the manifold for any crack, wastegate for any lose screw. The mod that I have on my care atm is a cold air intake AEM, and a ECU tune. Please help!!! I drive a AUTO 2011 Genesis coupe Base model if that helps.
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post #2 of 6 Old 01-09-2019
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Are you shure the sound isn't made when you let off gas . If this is the case you are golden

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I'm not an expert, I really have to press on gas really hard for it to go and it is insanely loud when I hold on gas. To answer your question no,
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post #4 of 6 Old 01-10-2019
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do a pressure leak test, easiest way to find leaks. Do it with target boost + 20% to make sure you have room above, as some leaks are not leaking until certain pressure level.

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Quote:
Originally Posted by Genesismouaa View Post
Hello is this my first forum but I am in need of help.

My car recently making the "SHHHHHH" sound that is very loud, which is causing my car to lose boost. I check everything, piping and retighten everything. I check the manifold for any crack, wastegate for any lose screw. The mod that I have on my care atm is a cold air intake AEM, and a ECU tune. Please help!!! I drive a AUTO 2011 Genesis coupe Base model if that helps.

Sounds like a MAJOR vacuum/boost leak. Check your intercooler pipes and those couplers. They do wear out/lose tension
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post #6 of 6 Old 01-10-2019
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Check PCV hoses too

2010 Silverstone 380GT
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