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BMW
525i
Engine
Symptoms
Noise
1990 BMW 525i hissing sound
1990 BMW 525I
160,000 MILES • 6 CYL • FWD • AUTOMATIC
RYAN2000
MEMBER
1 POST
theres a hissing sound came out under the hood
Feb 28, 2010 at 12:40 PM
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MHPAUTOS
✓
Experienced Mechanic
31,937 POSTS
Hi there,
This will normally be a vacuum leak, you will have to get a mechanic to go over the induction and brake booster and check for a leak, start there.
mark (mhpautos)
Feb 28, 2010 at 1:04 PM
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