Weird hissing noise, can't track it down
#1
Weird hissing noise, can't track it down
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.
Last edited by calgaryman; 08-27-2009 at 12:21 PM.
#2
Join Date: Apr 2008
Location: Lee County, North Carolina
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if you have a stock air box then its probably either cracked, has a hole in it, the crank case vent hose is unhooked or broken (it runs from the valve cover to the air box), the gasket between the air box and throttle body is broken or missing, the band that holds the air box to the throttle body is loose, the pcv valve is loose/broken/unplugged/ or has a hole in the hose that goes to the intake manifold, or the air filter doesn't have good contact between the top and bottom half of the air box.
if it is not the air box then it could be a vacuum leak or a loose/unplugged IAC but it is more than likely related to the air box. if it is the IAC then your idle would be craptastic.
if it is not the air box then it could be a vacuum leak or a loose/unplugged IAC but it is more than likely related to the air box. if it is the IAC then your idle would be craptastic.
#3
#4
I had the same problem, Sheriff420 suggested i use two gaskets on top of the Tb and it worked so it's worth a try, the gaskets only like 3 bucks, also when i was checking the hose to the pcv valve i inspected the valve and it looked like crap(literally) so i changed it as well, it's also one of the cheapest parts in the parts store.
Last edited by Ram80; 08-27-2009 at 02:43 PM.
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#7
Join Date: Apr 2008
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#8
I had the same problem, Sheriff420 suggested i use two gaskets on top of the Tb and it worked so it's worth a try, the gaskets only like 3 bucks, also when i was checking the hose to the pcv valve i inspected the valve and it looked like crap(literally) so i changed it as well, it's also one of the cheapest parts in the parts store.