Author Topic: Hissing noise at startup (Read 3827 times)

16v of E30 · « **on:** November 03, 2008, 02:36:55 AM »

Happends occasionally, when i start the car. Usually when i turn the car right over, i get a hissing noise under the hood, but the car always starts without hesitation. anything like this happen to you?

Cobra Jet · « **Reply #1 on:** November 03, 2008, 09:34:44 AM »

Nope.

Check any or all rubber vacuum lines under and around the intake (both upper & lower). Also, check the large rubber air intake tube going from the headlight bucket on the driver side to the airbox assembly - this tube is known for cracking due to age & engine heat.

JP 91iS · « **Reply #2 on:** November 03, 2008, 12:03:00 PM »

Well if the car starts without hesitation and idles fine I wouldn't suspect a vacuum leak. You should have someone else start the car while you listen around the engine bay, maybe its not really a hiss.

16v of E30 · « **Reply #3 on:** November 04, 2008, 12:17:01 PM »

yeah its weird...happens one in 5 startups...

was thinking it was fuel lines getting primed?

EN318isPDX · « **Reply #4 on:** November 04, 2008, 01:55:24 PM »

Quote from: 16v of E30;60033

yeah its weird...happens one in 5 startups...

was thinking it was fuel lines getting primed?

Could be, fuel likes to make a hiss noise when it leaks.. I'd start looking for fuel leaks

16v of E30 · « **Reply #5 on:** November 07, 2008, 05:53:23 PM »

no leaks...