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Old 08-09-2012, 11:18 PM   #1
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Confused!

Ok well I start my car up, sounds great. Run it fir bout a min or so and it starts makin a high pitch humming sound, it's and 86 5,0. Fuel injection... The noise is coming from around the intake almost under neath it or behind it. Any ideas guys please, I know y'all experts so help a buddy out!
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Old 08-09-2012, 11:40 PM   #2
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Re: Confused!

Sounds like a vac leak somewhere.
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Old 08-09-2012, 11:45 PM   #3
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Re: Confused!

pop the hood and start it...get up close to the intake and give her a little gas with the throttle cable. See if you can get a good pinpoint for where the humming is coming from. strange for a leak not to cause it to idle off even a bit...could be really small
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Old 08-10-2012, 02:28 AM   #4
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Re: Confused!

Check your EGR valve. The diaphragm may be leaking.
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