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05-25-2001, 03:33 PM | #1 |
Registered Member
Join Date: Oct 2000
Location: Charlotte NC
Posts: 193
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Sound from under valve cover???
Ok, I know this could be a million things but here gos. You can here a whistling sound under my hood and it seems to be coming from under my passenger side valve covers. When I put the handle end if a screwdriver to my ear and stick the other end of the driver to the valve cover right over the #1 cylinder, you can hear it pretty loud. Anybody had this happen oe have any idea what it could be. I just started hearing it about a month ago after switching to a synthetic blend but the car still runs great. ?????????????
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05-25-2001, 05:46 PM | #2 |
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Join Date: Nov 1998
Location: Houston, Tx.
Posts: 3,887
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Could it be related to the PCV valve? It might cause a whistling sound on the passenger side valve cover. That's where mine is connected. If it didn't shut completely off at idle, it might whistle a little. Take it out and squirt some carb cleaner through it and see if that helps. A new one is only a few bucks. Just a thought.
Rev ------------------ '66 Coupe, 306, 300 HP, C-4, 13.97 e.t., 100.3 mph 1/4 mi. |
05-27-2001, 03:50 PM | #3 |
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Join Date: Sep 1998
Location: Oviedo, FL
Posts: 992
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Has to be the PCV. Only thing that I know can whistle. Take Rev's advice, go by a new one, they're cheap.
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05-28-2001, 05:40 AM | #4 |
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Join Date: Apr 2001
Location: Hampton, Virginia
Posts: 227
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Mine was doing that and it tturned out to be a loose bolt on my carb.
------------------ 66 Mustang Black W/ Black 289 Hi-Po 65'heads, MSD Lunati High lift Cam 750CFM Carb Heddman Headers |
05-29-2001, 10:30 AM | #5 |
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Join Date: Oct 2000
Location: Charlotte NC
Posts: 193
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Replaced the PCV valve. Still no luck. I guess I should mention it's not a constant sound. It's the same pattern as like a lifter tick would be but this is a howling or whistling sound at the same time interval as a lifter tick. Could it be something with one of the rockers. I've never heard anything like this before. But it's definitely coming from under the valve cover.
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05-29-2001, 02:09 PM | #6 |
Registered Member
Join Date: Dec 1998
Location: Tampa, FL
Posts: 70
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A small exhaust leak at the header/manifold gasket has the same timed interval as a rocker and might also produce the whistle sound. Just a thought. Hope you find the problem .
Lou |
05-29-2001, 02:31 PM | #7 |
Registered Member
Join Date: Nov 1998
Location: Houston, Tx.
Posts: 3,887
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Could it be valve guides leaking past the valve stem/seal? My header leaks always sound like a lifter (click, click,click) or (piff, piff, piff). Just another possibility.
Rev ------------------ '66 Coupe, 306, 300 HP, C-4, 13.97 e.t., 100.3 mph 1/4 mi. |
05-29-2001, 02:39 PM | #8 |
Registered Member
Join Date: Sep 2000
Location: Hattiesburg, MS, USA
Posts: 86
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I had a whistle that would start after my motor warmed up. Turned out it was a warped metering plate on my carb. I swapped it for a metering block and the whistle stopped.
------------------ 65 convertible 289 Hi Po 4 speed |
05-30-2001, 10:32 AM | #9 |
Registered Member
Join Date: May 1999
Location: Rowlett,Texas
Posts: 306
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Hey David, pull the cover and take a look. Then lay some towels just below the cover and start it up and check again. This will help narrow down where it is exactly coming from. If you want use a long piece of tubing like the screwdriver technique and you will find it.
------------------ 69 351W Sportsroof deluxe |
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