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Old 01-20-2011, 01:31 PM   #1 (permalink)
James Hewitt
 
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Default New Vacuum sound at start up....

I am used to the sounds when I start my disco. But this morning and after work today when I started it there was an unrecognizable noise. It sounded like a high pitch vacuum cleaner wine. It last as long as the normal sounds and after about 2 min cuts off. No change in anything else with the car. Where should I start looking?
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Old 01-20-2011, 02:49 PM   #2 (permalink)
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SO when I got home I opened the hood and went up front. I throttled up a bit to see if I could find the sound. It is a high pitched wine. It really sounds like it is coming from the throttle body itself. I am going to do an induction cleaning as well as clean the inside of the throttle body. Any other thoughts?
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"You can't change everything you face, but you must face everything in order to change"...
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Old 01-20-2011, 04:08 PM   #3 (permalink)
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does the truck have secondary air, the chrome valves would be on both sides of the engine, when the engine is cold the secondary air will make a loud like a vacuum or hair drier sound, this normal, does the truck have high miles & what year is it.
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Old 01-20-2011, 07:32 PM   #4 (permalink)
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2000 disco II with SAI and it has 134,000 miles. I did find a vacuum hose undone. But the sound continued after I fixed it. I was planning on opening the hood tomorrow when I start it to leave in the am.
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"I understand the jeep thing, thats why I bought a Rover"

"You can't change everything you face, but you must face everything in order to change"...
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Old 01-20-2011, 09:41 PM   #5 (permalink)
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check the opposite side of the intake (from the throttle body), there are 2 hoses that go into the intake. directly under those hoses there is another connection capped off... that blank rubber cap will rot/crack and fall off. this might be the source of the "whistle" sound.
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