Question:
This noise seems to be coming from the top of the engine somewhere.
Answers:
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Vacum Leak!Some are a @#%#$ to find and may be best if you get it checked by a trusted mechanic, once it's found, you might be able to perform the work yourself to help save on cost of labor...
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Best Wishes!
"/JOe
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1. Check all your vacuum connections
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2. Move the vehicle to a well ventilated are away from combustibles
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3. If the vehicle is equipped with a tach, have someone sit inside & observe the tach.
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4. Purchase a can of starting fluid or plenum cleaner.
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5. Light spray along the side of the intake manifold where it contacts the head
6. If the tach. increases RPM, then your intake or a vacuum line may be damaged.
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7. To be on the safe side, wear a long sleeve cotton shirt & protect your face.
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You have a vacuum leak. Look for a cracked or loose vacuum hose or connector. If you cannot find a bad hose then you may use CARB CLEANER to spray around the intake area and listen for a rise in engine rpm. Please DO NOT use starting fluid as somebody else suggested! It contains ether and can blow you sky high if there is a stray spark or heat source.
Sounds like you have a vacuum leak.
It could be as simple as a cracked or worn vacuum hose or fitting, or more involved such as a leaky intake gasket.
Being that it's a '97, I'm assuming that it has Electronic Fuel injection, but could also be a Throttle Body System.
It's easy to distinguish between the two.
E.F.I. has individual fuel injectors for each cylinder.
A Throttle Body System has what appears to be a carbeurator on the top of the engine.
I point this out because if it is a T.B. set up, the throttle body may have come loose. When this happens, air will get pulled into the engine without passing through the throttle body, & therefore not mixing with fuel making the engine run lean.
The easiest way to check for a vacuum leak is to get a can of carb & choke cleaner from your local parts house.
With the engine running CAREFULLY spray the cleaner around the intake manifold, & vacuum hoses. If the R.P.M.'s go up, or if the engine changes it's idling when you hit a certain spot, that's where your leak is.
Has the vehicle been worked on lately? If so, is that when you noticed the problem?
Maybe a vacuum hose was accidently comprimised.
Good luck, let me know how you made out.
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Hmmmm, vacuum leak, yes. Spraying starting fluid, it has been done. But using carb cleaner instead because of flammability? Carb cleaner burns too!! Use water in a spray bottle, it is the safest method. The whistling will stop for a moment and the engine will sputter. Using starting fluid or carb cleaner is another way, but not as safe.More Questions & Answers ...
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