SOURCE: fuel pressure regulator had no vacuum line connected
another engineers wet dream. think of it this way . what is normally in the intake when the engine is running.. answer vacume, hence the regulator gets its vacume without a hose connected to it as its already in a full time vacume chamber.no hose required . ps be carefull to seat the regulator and o rings securely into the housing befor you reattach the secureing metal clip.
good luck chris
SOURCE: where does the vacuum line on air intake duct
Are you referring to the plastic line that comes out of the top of the duct, turns and disappears toward the back of the engine? That line goes to the top of the rear valve cover. Use a flashlight and look for the hole on the top of the back valve cover. Look to the right and below the coils. It's tough to see but you can see it. Be careful, sometimes the plastic line can be brittle and break.
SOURCE: poor fuel milage on a 1993 chevy 1500 with a 4.3
check your timming, it sounds like its out of adj.
SOURCE: torque spec for 2002 venture van with 3400 motor
haynes catalog has them in front of each section
SOURCE: 1998 5.7.Ltr ,plastic upper intake,alum
start the engine and get some o2 sensor safe throttle body cleaner, and ( be carefull not to squirt the sparkplug wires or coils) spray it on a cold engine while running while you listen for the rpm to change. what you are doing is when u spray into the area that is the vacuum leak it will( depending on the spray u use) either stumble and lower the rpms or it will rev higher for a few seconds. where ever you hear a difference in rpm, that is where u need to look for your connection. this is how we do it in our shop. good luck.
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