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Author Topic: 2002 powerstroke vacuum leak? 2Coupes ¯ Member # 5617 posted                              i have a 2002 f250 7.3 liter. when i let the truck idle for a few minutes the rpms go from normal 6-700 range to about 1000. and i hear a hissing noise, it sounds like its coming from the pass side of the motor. if i hit the gas pedel or tap the break pedel the idle drops back to normal. everything eles seems fine and the truck runs great. any help would be great thanks guys -------------------- 91Coupe-347,tremec tko, 373's 68Coupe-GT40heads,crane2031cam,victor jr,tremec3550,3.55's R.I.P. silverlx Posts: 201 | From: Healdsburg, CA | Registered: Apr 2005  |  : BIGBALLFACTOR ¯ Member # 7277 posted                              it would be really hard for a powerstroke to have a vacuum leak Posts: 6908 | From: okc | Registered: Dec 2006  |  : 2Coupes ¯ Member # 5617 posted                              Ok it's my first diesel, but when I here that noise on my stang I know it's a vac leak. -------------------- 91Coupe-347,tremec tko, 373's 68Coupe-GT40heads,crane2031cam,victor jr,tremec3550,3.55's R.I.P. silverlx Posts: 201 | From: Healdsburg, CA | Registered: Apr 2005  |  : blown95svt ¯ Member # 8893 posted                              The only vacuum on that truck is an a storage tank that has an electric pump. Used for ac, and auto lock 4x4 hubs. Sounds like you have a silicon coupler leaking boost. Common for those trucks. Gotta clean the coupler and get the oil off before installing or it will just blow off. Pm me if ya need and more info. -------------------- 95 cobra blown 331 gr40 suspension ***NEED QUALITY WORK FOR HALF THE PRICE? I DO SIDE JOBS! PM FOR DETAILS*** www.norcalmotorcompany.com Posts: 1434 | From: roseville | Registered: Jan 2009  |  : acmikee ¯ Member # 5568 posted                              mine does the same thing untill it warns up. so i wouln't worry it. does it have a chip? if not put one in along with an airraid filter system..... Posts: 241 | From: fremont | Registered: Apr 2005  |  : 2Coupes ¯ Member # 5617 posted                              Ok I'm gonna check that on the turbo this weekend. seems like it could be that! Yes it has a programer the edge I think -------------------- 91Coupe-347,tremec tko, 373's 68Coupe-GT40heads,crane2031cam,victor jr,tremec3550,3.55's R.I.P. silverlx Posts: 201 | From: Healdsburg, CA | Registered: Apr 2005  |  :

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