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1995 gmc sierra 4.3L v6 when engine is running there is a hissing noise coming out the engine area..also noticed the oil pressure increased..

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Sounds like you have a vacuum leak, A dry rotted hose with cracks is usually the problem. Listen from where the sound is coming from and you will be able to pin point a small area of vacuum lines. Good Luck

Posted on Mar 19, 2011

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Got a 96 gmc nd i have a small hissing sound come from the engine while driving


First thing I would look for is a vacuum line leak. Engine heat can make lines brittle or something like fuel or oil on lines not made for it will weaken those lines causing cracks, breaks, etc. Also a line could just not be connected (knocked loose during maintenance and missed). Sometimes these will affect performance but not always, and you didn;t mention anything other noticed issues. I'd check all hose connections of any kind as well.

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Hi...2008 gmc sierra crew...check engine light came on thought maybe was standard just before hitting 30,000 then noticed low oil pressure ( 20 ) then noticed clacking noise?


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low or no oil pressure... check the level of the oil .. add if necessary and have the oil pressure checked

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Low oil when engine warms up gmc sierra 1995


30-40 psi of oil pressure is fine for many vehicles including your GMC. I am assuming that the truck has more than 100,000 miles on it and still has the original engine in it. By rule of thumb you only need 10 psi per 1000 rpms in a typical street driven engine to give adequate oil pressure to keep the bearings from oil starvation. The oil pressure is typically higher when initial start up occurs because it is more viscous due to the temperature of the oil as the engines oil warms up the visconsity thins out and the oil flows more smoothly. The drop in oil pressure is a normal occurance. Above 45 is more than required for a daily driven street engine. I believe that the specs on that engine only list 30- 45 psi.

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