I have a 74 2.0L with stock Djet EFI and have a question Re: idle adjustment screw.
Is it normal or abnormal to hear the air slightly hissing when you increase the idle adjustment screw? It seems to become noticeably louder when I have it at about halfway out. It does seem to adjust the idle but it isn't super sensitive like I've read it should be; could I have a leak in the plenum or elsewhere? I have replaced all of my vacuum hoses and feel pretty good about them not leaking in general....however, I'm unsure about the intake plenum and throttle body gasket. I don't seem to have any real problems with high idle or idle hunting but was concerned about the idle screw hissing a bit. Thanks for the help!!
Full Version: Djet question
QUOTE(Java2570 @ Jul 21 2011, 06:18 AM) 
I have a 74 2.0L with stock Djet EFI and have a question Re: idle adjustment screw.
Is it normal or abnormal to hear the air slightly hissing when you increase the idle adjustment screw? It seems to become noticeably louder when I have it at about halfway out. It does seem to adjust the idle but it isn't super sensitive like I've read it should be; could I have a leak in the plenum or elsewhere? I have replaced all of my vacuum hoses and feel pretty good about them not leaking in general....however, I'm unsure about the intake plenum and throttle body gasket. I don't seem to have any real problems with high idle or idle hunting but was concerned about the idle screw hissing a bit. Thanks for the help!!
Normal
QUOTE(76-914 @ Jul 21 2011, 06:48 AM)
QUOTE(Java2570 @ Jul 21 2011, 06:18 AM)
I have a 74 2.0L with stock Djet EFI and have a question Re: idle adjustment screw.
Is it normal or abnormal to hear the air slightly hissing when you increase the idle adjustment screw? It seems to become noticeably louder when I have it at about halfway out. It does seem to adjust the idle but it isn't super sensitive like I've read it should be; could I have a leak in the plenum or elsewhere? I have replaced all of my vacuum hoses and feel pretty good about them not leaking in general....however, I'm unsure about the intake plenum and throttle body gasket. I don't seem to have any real problems with high idle or idle hunting but was concerned about the idle screw hissing a bit. Thanks for the help!!
Normal
your ears are normal
QUOTE(kkid @ Jul 21 2011, 11:54 AM)
QUOTE(76-914 @ Jul 21 2011, 06:48 AM)
QUOTE(Java2570 @ Jul 21 2011, 06:18 AM)
I have a 74 2.0L with stock Djet EFI and have a question Re: idle adjustment screw.
Is it normal or abnormal to hear the air slightly hissing when you increase the idle adjustment screw? It seems to become noticeably louder when I have it at about halfway out. It does seem to adjust the idle but it isn't super sensitive like I've read it should be; could I have a leak in the plenum or elsewhere? I have replaced all of my vacuum hoses and feel pretty good about them not leaking in general....however, I'm unsure about the intake plenum and throttle body gasket. I don't seem to have any real problems with high idle or idle hunting but was concerned about the idle screw hissing a bit. Thanks for the help!!
Normal
your ears are normal
OK, thanks guys!! That makes me feel better!
Its an Idle Air Bypass screw.
The more its open, the more air flows past the screw.
the screw is shaped like a cone, so the air will hiss going past it.
rich
The more its open, the more air flows past the screw.
the screw is shaped like a cone, so the air will hiss going past it.
rich
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