Weird hissing noise, can't track it down
Grand Champion
Joined: Apr 2008
Posts: 7,055
Likes: 7
From: Lee County, North Carolina
its the round one. the other gasket goes between the throttle body and the intake manifold and it leaking isn't a common problem. unless the throttle body bolts are loose, then i could see having some air getting between the intake and the throttle body.
Registered User
Joined: Sep 2009
Posts: 6
Likes: 0
Hey everyone,
I have a 1998 Dodge Ram, 5.9L with 167,000 miles.
I have a weird problem. I have tried to search on the forum, but it’s hard because I don’t know how to accurately describe of the problem.
I have a weird “hissing” or “shhhh” noise coming from the engine area. I can only hear it in the cab, when I step on the gas. Trying to track the noise down outside is hard because of the engine noise.
I suspect a vacuum leak, it sounds as though it is coming from the brake booster. I did do a vacuum test on the crank case to see if my plenum was leaking. There was no vacuum in the crank case (nor a pressure build up).
Seems to be running good, except horrible gas millage lol
Thoughts?
Thanks in advance.
I have a 1998 Dodge Ram, 5.9L with 167,000 miles.
I have a weird problem. I have tried to search on the forum, but it’s hard because I don’t know how to accurately describe of the problem.
I have a weird “hissing” or “shhhh” noise coming from the engine area. I can only hear it in the cab, when I step on the gas. Trying to track the noise down outside is hard because of the engine noise.
I suspect a vacuum leak, it sounds as though it is coming from the brake booster. I did do a vacuum test on the crank case to see if my plenum was leaking. There was no vacuum in the crank case (nor a pressure build up).
Seems to be running good, except horrible gas millage lol
Thoughts?
Thanks in advance.
Grand Champion
Joined: Apr 2008
Posts: 7,055
Likes: 7
From: Lee County, North Carolina
grab a spare piece of rubber hose around 3/8" to 1/2" in diameter (about 2.5' ought to be enough) and use it to try to track down the noise. if you put it to one ear and plug the other then you might be able to find the source of the noise.
