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| Registered User Join Date: Jul 2011 
					Posts: 1
				 |  loud pop 
			I,have a 78 911sc 3.0 started it up  heard a pop then what I thought was an exhaust leak pretty loud, could not find one i'm thinking exhaust gasket or head gasket,car runs but the idle is up & down,it has ss heat exchangers any ideas,tmacman
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|  09-04-2013, 10:23 AM | 
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| Vintage Owner | 
				
				Pop
			 
			Do you have a blowoff valve in the air box?  Could have been a backfire.
		 
				__________________ 84 Targa (sold) 70 914-6 (sold) 73 914-6 2.7 conversion (sold) 75 GMC Motorhome (sold) 2016 Cayenne | ||
|  09-04-2013, 10:25 AM | 
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| Registered Join Date: Oct 2008 Location: Nash County, NC. 
					Posts: 8,522
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			Check airbox for blowing. look at the little screws around the perimeter and see if they have come loose.    If you have a pop off valve, make sure you didnt blow it out of it location.  Check the rubber seal under the cap/ Bruce | ||
|  09-04-2013, 10:32 AM | 
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