Hissing from Manifold area - Maintenance and Repair Forum

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Hissing from Manifold area
Tuesday, January 04, 2011 11:01 AM
CEL stored was P0507 (higher than normal idle)
There is a deffanite hissing comming from the manifold area, but i doubt
its a crack. I hook up my computer to the cars ecu and it told me the
manifolds pressure was at about 6.15.-6.25. Is this normal? Could it be a possibility
that the PCV is clogged. Advice anyone? I wish i had the repair manual for this car.

Re: Hissing from Manifold area
Tuesday, January 04, 2011 11:50 AM
vaccuum leak.



Re: Hissing from Manifold area
Tuesday, January 04, 2011 11:57 AM
any idea where to start looking?
Re: Hissing from Manifold area
Tuesday, January 04, 2011 2:07 PM
Fill out your profile so we know what year and motor.





Re: Hissing from Manifold area
Tuesday, January 04, 2011 2:49 PM
just did

1996 Pontiac Sunfire GT 2.4 120,000 miles on chasis 45,000 on rebuilt engine.
Re: Hissing from Manifold area
Tuesday, January 04, 2011 3:40 PM
does it go WOO WOO





Re: Hissing from Manifold area
Tuesday, January 04, 2011 3:53 PM
Bump
Re: Hissing from Manifold area
Tuesday, January 04, 2011 4:02 PM
Ztwenty4door wrote:does it go WOO WOO


he showed off ONE thing....he does NOT know how to drive that supra LOL



Re: Hissing from Manifold area
Tuesday, January 04, 2011 5:15 PM
Check all vacumm lines on the throtle body (there are three small vacumm hoses at the front)
Re: Hissing from Manifold area
Wednesday, January 05, 2011 1:13 AM
Especially check the vacuum line going to the MAP sensor. Very common for these to crack and break on the 2.4 engines. I replace a couple of them a month.




Currently #4 in Ecotec Forced Induction horsepower ratings. 505.8 WHP 414WTQ!!!
Currently 3rd quickest Ecotec on the .org - 10.949 @ 131.50 MPH!!!

Re: Hissing from Manifold area
Friday, January 07, 2011 4:11 PM
Grab a can of carb cleaner and while the engine is running, spray it over the vacuum lines and intake manifold and injectors. If there is a leak that will tell you around where its at. When you spray it do it in little bursts. This way when the engine starts to sputter from the carb cleaner that tells you in the general area the air leak is coming from. Hope this helps!





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