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Old 12-05-2003, 08:08 PM   #1
djcontra
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Unhappy Hissing sound under car? wtf?

Guys, I'm hearing a loud hissing sound, like a disconnected air or vaccum hose under the car somewhere. What parts might I look at to track it down? It sounds like it might be near the tranny area, or oil pan.
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'94 Supercharged E36 325is (150,000 original km's)
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Old 12-05-2003, 10:22 PM   #2
Jon@Bimmersport
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i heard a "meeeoooow" while driving my dads car when we were going to the gym....out of no where it crawls from under the car when i park
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Old 12-05-2003, 10:35 PM   #3
87e30
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if the e36 has an external fuel pump try that, I know on e30s when the external one goes bad it hisses
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Old 12-05-2003, 10:43 PM   #4
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Could be a boost leak! When it gets cold, hoses tend to contract and move around.
I have a hissing sound too sometimes, and I have to do a test to make sure I'm not losing boost!
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Old 12-06-2003, 04:37 PM   #5
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Quote:
Originally posted by moerom
Could be a boost leak! When it gets cold, hoses tend to contract and move around.
I have a hissing sound too sometimes, and I have to do a test to make sure I'm not losing boost!
It shouldn't be a boost leak because I'm using all new plumbing and silicone cuplings (I just installed a new intercooler yesterday). Plus the sound is far away from the engine. I'll have to find out if the brake system, or tranny uses any vaccum hoses or anything...hmmm...
I'm not going to drive until I get it sorted out though..
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'94 Supercharged E36 325is (150,000 original km's)
Mods
-Vortech V9 G-Trim @ ~10psi w/ BOV
-Shortstack headers
-Vortech RRFPR
-255LPH Walbro fuel pump
-TEIN SS Coilovers w/ Pillowball mounts
-Keskin KT1 17x8.5 & 17x10
-Remus full catback
-Authentic Rieger Infinity I body kit
-SMT6 EMS (Untuned)

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Old 12-06-2003, 04:50 PM   #6
blacknblue-e30
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crack in the exhaust?
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Old 12-06-2003, 05:15 PM   #7
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I'll check that out...I sure hope there isn't a crack
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'94 Supercharged E36 325is (150,000 original km's)
Mods
-Vortech V9 G-Trim @ ~10psi w/ BOV
-Shortstack headers
-Vortech RRFPR
-255LPH Walbro fuel pump
-TEIN SS Coilovers w/ Pillowball mounts
-Keskin KT1 17x8.5 & 17x10
-Remus full catback
-Authentic Rieger Infinity I body kit
-SMT6 EMS (Untuned)

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Old 12-07-2003, 11:14 AM   #8
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It is most probably your fuel pump, have you replaced it before?
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Old 12-07-2003, 01:29 PM   #9
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Quote:
Originally posted by Gizmo
It is most probably your fuel pump, have you replaced it before?
No I havent, but isn't the fuel pump near the rear of the car, by the gas tank?
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'94 Supercharged E36 325is (150,000 original km's)
Mods
-Vortech V9 G-Trim @ ~10psi w/ BOV
-Shortstack headers
-Vortech RRFPR
-255LPH Walbro fuel pump
-TEIN SS Coilovers w/ Pillowball mounts
-Keskin KT1 17x8.5 & 17x10
-Remus full catback
-Authentic Rieger Infinity I body kit
-SMT6 EMS (Untuned)

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Old 12-07-2003, 01:41 PM   #10
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Quote:
Originally posted by 87e30
if the e36 has an external fuel pump try that, I know on e30s when the external one goes bad it hisses
that happened to my e30 too.I'd check the feul pump.Mine was near the back of the drivers door
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Old 12-07-2003, 02:29 PM   #11
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Ok cool, I'll check that. It's very possible that my fuel pump might be going because of the heavy load it endures now due to the s/c
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'94 Supercharged E36 325is (150,000 original km's)
Mods
-Vortech V9 G-Trim @ ~10psi w/ BOV
-Shortstack headers
-Vortech RRFPR
-255LPH Walbro fuel pump
-TEIN SS Coilovers w/ Pillowball mounts
-Keskin KT1 17x8.5 & 17x10
-Remus full catback
-Authentic Rieger Infinity I body kit
-SMT6 EMS (Untuned)

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Old 12-07-2003, 03:06 PM   #12
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I had a s/c on my last car.I needed to upgrade the feul pump.
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Old 12-09-2003, 04:36 AM   #13
A~G
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I'd say its an exhaust problem .. My car sounds like a fuken airplane. The bend-pipe (don't know the exact name) but its the part of the exhaust system that acts as a shock absorber is broken... not to mention the numerous holes all the way to the muffler
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