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Old 12-03-2011, 04:04 PM   #1 (permalink)
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Default Intake Plenum Hissing.

I'm not sure if this has been posted yet or not, but here ya go.
I washed my engine bay about a week ago and it wouldn't start afterwords. I noticed that the bank 1 (rear) cat was glowing. I shut it off.
Came in to work, where my car was, the next day and checked the spark plug tubes. they were wet which is what I thought would cause the bno start and the cat being glowing hot from too much fuel and no combustion. I raised the car and took down the y pipe from the exhaust, like I thought, there was debri falling from the rear catalytic converter.
I took a skinny pry bar and chnked everything out of it that I could. Nothing else came out and I couldn't see anything else in it.
I then proceeded to change my valve cover gaskets, spark plugs and plenum gaskets. I got it all back together and it seems to be running fine...
Other than I hear a hissing noise coming from under the middle of the upper intake plenum.

Can anyone tell me what this hissing could be?? And the vaccuum hose that connects to the top of the EGR valve is barley sucking any air. Not sure if it is supposed to have a lot of vaccuum or not...

Any help would be great. Thanks.
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Old 12-03-2011, 04:19 PM   #2 (permalink)
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did you look for a hole in the intake?
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Old 12-03-2011, 09:29 PM   #3 (permalink)
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Check pcv hose assy. buried down in front of intake. May be bad or disconnected. You probably have a broken or disconnected vacuum hose or line on the front or rear of the intake due to all the repairs made. There are a lot of possibilities.

Last edited by sheila; 12-04-2011 at 11:44 AM.
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Old 12-03-2011, 10:06 PM   #4 (permalink)
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Quote:
Originally Posted by Shanem0789 View Post
I'm not sure if this has been posted yet or not, but here ya go.
I washed my engine bay about a week ago and it wouldn't start afterwords. I noticed that the bank 1 (rear) cat was glowing. I shut it off.
Came in to work, where my car was, the next day and checked the spark plug tubes. they were wet which is what I thought would cause the bno start and the cat being glowing hot from too much fuel and no combustion. I raised the car and took down the y pipe from the exhaust, like I thought, there was debri falling from the rear catalytic converter.
I took a skinny pry bar and chnked everything out of it that I could. Nothing else came out and I couldn't see anything else in it.
I then proceeded to change my valve cover gaskets, spark plugs and plenum gaskets. I got it all back together and it seems to be running fine...
Other than I hear a hissing noise coming from under the middle of the upper intake plenum.

Can anyone tell me what this hissing could be?? And the vaccuum hose that connects to the top of the EGR valve is barley sucking any air. Not sure if it is supposed to have a lot of vaccuum or not...

Any help would be great. Thanks.
The vac line that goes to the egr valve only has very slight vacuum to it so unless it has NO vacuum you should be fine.

As far as the hissing, my duratec hisses too and I'm convinced that it's normal operation. I replaced all vac hoses, checked for cracks in the plentum, replaced upper and lower intake manifold gaskets, along with egr and TB gaskets and it's all the same. it's just a hissy motor.

How is it running when you have a load on the engine? It can sound like it's running 'fine' at idle, but when you get on it driving does it studder/feel like it has no balls?
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Last edited by sousa632; 12-03-2011 at 10:11 PM.
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Old 12-03-2011, 10:40 PM   #5 (permalink)
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I have that same hiss as well in the same area. Car runs just fine.
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Old 12-03-2011, 10:52 PM   #6 (permalink)
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maybe we should call it the cobra jet duratec.
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Old 12-04-2011, 07:48 AM   #7 (permalink)
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Quote:
Originally Posted by Bull Geek View Post
I have that same hiss as well in the same area. Car runs just fine.
Duratec with plastic intake runner makes an internal hissing at idle from the IAC. It may not be a leak, both mine sound that way, and the fuel trims close to zero at idle. No leaks on mine. Propane test done also. New PCV and hose as well as new ells on valve cover fresh air supply.

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Old 12-04-2011, 09:34 AM   #8 (permalink)
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The PCV elbow under the throttle body is a well know part to leak.
Best to remove and fully examine it.
My DOHC with plastic intake is quiet at idle, only sound is the injectors ticking.
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Old 11-08-2012, 08:24 AM   #9 (permalink)
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I replaced the elbow under the throttle body, the EGR pressure sensor was broken also, so that was replaced. The car sort of idles a little high at red lights and I have also noticed a small surge while sitting at red lights or stops. It runs pretty good considering mileage. (137,023). Both PCV elbows in tops of valve cover gaskets are new. I still have the "hissing" sound from UIM area. Have sprayed for any intake leaks and no change in idle.
IACV replaced as well. Any suggestions as to the hissing that I may have missed or the "surge" I get at stops?
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Old 11-08-2012, 09:51 AM   #10 (permalink)
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The plastic EGR hoses behind the UIM can become broken or melt under high temps. I would inspect those. Do the cigar smoke test.
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