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jgreen3d
GenII
 
3/11/2008
18:55:31
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 Subject: PVC seal whistling
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Message:
My PCV valve gromett is whistling. Bad seal or bigger problem?
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Josh
Dodge Dakota
JOIN HERE
3/11/2008
20:54:56
| RE: PVC seal whistling
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Message:
Another case of not enough information, so:
It depends.
Is it blowing air out or sucking it in? If it's sucking in, probably time for a new GROMMET. If it's blowing air out, might be you need a new PCV valve (coupla bucks), or your rings could be shot(many hundreds of bucks).
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jgreen3d
GenII
3/12/2008
15:06:05
| RE: PVC seal whistling
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Message:
Air appears to be blowing out. I just changed the PCV valve and the engine was just put in 1000 miles ago, so I cant imagine the rings being bad. Its tough to tell which way the air is going. Any other thoughts?
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Josh
Dodge Dakota
JOIN HERE
3/12/2008
18:29:28
| RE: PVC seal whistling
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Message:
Well, yeah, but first you must know beyond doubt which way the air is going.
With engine idling, pull the PCV valve out of the grommet, and check for pressure or vacuum by covering the hole with your thumb.
Also, check for vacuum at the grommet end of the PCV valve. If no vacuum, remove PCV from hose and check for vacuum at the hose. If no vacuum at the hose, disconnect other end of hose and check for vacuum where the hose connects. MUST HAVE VACUUM.
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jgreen3d
GenII
3/13/2008
06:07:13
| RE: PVC seal whistling
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Message:
There is definately vacuum through the PCV and there doesnt seem to be anything blowing out of the grommet hole, not alot of suction in either. I just ordered another set of grommets, but the seal feels tight right now. Maybe there is some deterioration on the inside of the grommet I cant see. Thanks for you help. If you have any other thoughts as to what it might be PLEASE let me know.
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Josh
Dodge Dakota
JOIN HERE
3/13/2008
20:55:47
| RE: PVC seal whistling
IP: Logged
Message:
So when you wiggled the PCV valve in the grommet, the whistling noise went away?
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jgreen3d
GenII
3/14/2008
18:11:57
| RE: PVC seal whistling
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Message:
Yes, when I move the PCV the whistling stops.
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Justin
Dodge Dakota
JOIN HERE
3/14/2008
19:20:12
| RE: PVC seal whistling
IP: Logged
Message:
Might as well give up on this guy, Josh.
If you gotta play 20 questions with him to get some answers, he's wasting your time.
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Cosgrove
Dodge Dakota
JOIN HERE
3/15/2008
08:04:40
| RE: PVC seal whistling
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Message:
Give him a break, Justin. Based on his original question, he dosen't know anything about engines or how to trouble shoot them. and he certainly doesn't know how to ask for help. For some people, learning is a slow process. So you gotta be patient sometimes.
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jgreen3d
GenII
3/15/2008
17:42:20
| RE: PVC seal whistling
IP: Logged
Message:
I must apologise, I was unaware that there was a secret code for asking for help. If I knew how to trouble shoot a problem like this any farther than I did before I posted, I wouldnt need to ask the advice of others more knowledgable on the subject. That said, based on what I have told you, is there anything you can tell me that may be the source of this PCV whistling, any testing I can do to help diagnose it or is there any other info I can relay to you that may help you help me?
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Josh
Dodge Dakota
JOIN HERE
3/15/2008
21:49:59
| RE: PVC seal whistling
IP: Logged
Message:
OK. so we've narrowed it down to a harmless whistle noise either from within the PCV valve, or from a vacuum leak at the PCV valve grommet in the rocker cover.
Has it whistled since the engine was installed?
Or just since replacing the PCV valve?
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jgreen3d
GenII
3/16/2008
08:43:58
| RE: PVC seal whistling
IP: Logged
Message:
the whistling started while breaking in the new engine, about 700 miles into the new engine. I checked for any obvious leaks as best I know how, breather, PCV hose, and checked to see if the PCV itself was still rattling. I replaced the PCV just to make sure that wasnt the problem. It does seem to be a harmless problem but the last thing I want to do after dropping the cash for a new engine is pass this off as a nothing, when it may be an indication of a problem. I do appreciate the help.
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Josh
Dodge Dakota
JOIN HERE
3/16/2008
11:18:23
| RE: PVC seal whistling
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Message:
Sounds like you have a good engine. No blow-by (that's good), and a healthy vacuum through the PCV valve.
Here's my take on your situation. The vacuum through the PCV valve is creating a negative pressure in the crankcase, and the air leaking by the PCV valve grommet is getting sucked in to try and equalize the pressure.
Here's what I think is missing. Usually, there is a hose that goes from the air filter housing (or, in the case of an aftermarket CAI system, from a hose port between filter and throttle valve) to an area on a rocker cover, crankcase, intake manifold oil gallery port or some such, that lets in some clean filtered air to equalize that pressure. When the PCV valve is fully open, it sucks crankcase vapors into the intake stream, but there has to be a means to replace what's getting removed with clean filtered air.
Take a real good look at your air filter housing to see if there are any blocked off hose ports. If there is a small diameter hose (could be rubber, plastic, or combination) that goes from the air filter housing to an area on the engine like I mentioned, check it to be sure it's not plugged or blocked.
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Josh
Dodge Dakota
JOIN HERE
3/16/2008
11:24:22
| RE: PVC seal whistling
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Message:
I was just reviewing the thread after my previous post and realized I missed that you mentioned a breather. The breather, in whatever form it takes, is the means to let in that clean filtered air. Check it to make sure it actually does breathe.
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jgreen3d
GenII
3/18/2008
20:09:04
| RE: PVC seal whistling
IP: Logged
Message:
as it turns out the hose that attaches to my pcv was a fuel line hose and was colapsing causing the grommet to whistle. Thanks for all your help.
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