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Author Topic: help! please help!!anyone know anything about vacume? phat50 ¯ Member # 1998 posted                              well if i take my capp on the back of my preformer intake on the vacume line off and start the car it will idle fine,but if i plug it up it wants to die,for like 15 or 20 seconds then it will idle fine,until i cut the car off and start it back up then it will try to cut off again unless i take the capp off of the vacume line on the back of the intake and have it sucking in air then it will idle fine,what could this be,i dont want to drive around with a vacume line disconected and sucking in air just so it will idle fine when i start it up,please help? -------------------- New toy coming soon! Posts: 2860 | From: Richmond / Valley jo/ Petaluma | Registered: Oct 2002  |  : mtbaughs Road Racer Member # 4052 posted                              Are you running a pcv on the lower intake to the upper? Do you have the crankcase line from the oil filler tube to the throttle body? Sounds like you may not be venting your crankcase properly Posts: 2019 | From: Boise, Idaho | Registered: Jan 2004  |  : mtbaughs Road Racer Member # 4052 posted                              If you are running heads and a cam you might be in need of an IAC adjustor plate as many cars need a touch more air past the throttle body with a cam. -------------------- R.I.P. Charlie Bruno Dec 2001 Posts: 2019 | From: Boise, Idaho | Registered: Jan 2004  |  : phat50 ¯ Member # 1998 posted                              i have a iac adjuster,which way dose it go on,i have mine with the part number facing up,is that right? -------------------- New toy coming soon! Posts: 2860 | From: Richmond / Valley jo/ Petaluma | Registered: Oct 2002  |  : vpr_klr ¯ Member # 3353 posted                              drill an 1/8" hole in the throttle plate, works for me everytime! -------------------- Project crustang has begun 14 mustangs and counting... Posts: 893 | From: Livermore | Registered: Oct 2003  |  : mtbaughs Road Racer Member # 4052 posted                              Yes part # faces up. The way I always go about setting this is pretty straight forward. First thing you want to do is set your idle. Usually about 900-950 RPM. From there set your tps sensor to .95 volts. The IAC adjustor is than used to fine tune the throttle and idle. Doing all this makes for a perfect idle in most cases. If not than you might have other issues causing a problem. -------------------- R.I.P. Charlie Bruno Dec 2001 Posts: 2019 | From: Boise, Idaho | Registered: Jan 2004  |  : phat50 ¯ Member # 1998 posted                              i already put a hole in the throttle plate,and my tps volts are at .98,i adjusted the idle with the iac adjuster to about 1000 rpms and for some reason when i plug up all my vacume lines like there suppose to be,it will surge really bad and try to cut off unless i give it some gas for about 15 or 20 secondes then it will idle fine until i cut the car off and start it back up then it will do it all over again,what could it be? -------------------- New toy coming soon! Posts: 2860 | From: Richmond / Valley jo/ Petaluma | Registered: Oct 2002  |  : mtbaughs Road Racer Member # 4052 posted                              Could be many different things. I'd have to see the car Posts: 2019 | From: Boise, Idaho | Registered: Jan 2004  |  :

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