Subject	Hissing sound by the #3 cylinder
Posted by	GBlack300TT on April 14, 2021 at 10:56 PM
	This message has been viewed 158 times.
Message	Hey guys I recently replaced all my spark plugs on my 91 300zx tt. Upon starting the car and was surprise to hear a large hissing sound coming from the area around #3 cylinder. It sounds like a huge vacuum leak which ultimately causes the car to turn off within 30 seconds of turning it on. The vacuum leak sounds as if its coming behind the engine by the firewall. Is there anything back there that could cause this? Would a blown out head gasket be the culprit? Thanks
Follow Ups	Hissing sound by the #3 cylinder - GBlack300TT 22:56:32 04/14/21 EGR Vacuum lines (n/m) - Cjw3 04:36:59 04/15/21
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