View Single Post
Jim2 Jim2 is offline
7.0:1 > 11.3:1
Join Date: Oct 2003
Location: Calgary
Posts: 1,863
So no leakage from your brake booster, this is good.

Sort of an odd picture angle, but here is the brass fitting which I was questioning. It would be facing forward toward your back seat.

Since the engine died when you covered the throttlebody I would suspect the idle bypass valve or your butterfly plate, though it still could be a combination of a couple leaks.

Put your finger over the oblong port seen inside the throttlebody throat above. This is where the air enters the idle bypass valve which you said you closed by screwing in all the way. Covering this port will confirm the valve is closed if there is no idle speed change.

In the following picture you can see the set screw (yellow paint) which limits the closed position of the butterfly, which you say is backed off. (If so beware that the butterfly will stick shut by binding in the throat of the throttlebody. You will need to readjust it when done) but first try removing your TPS (throttle position sensor) off the end of the throttle shaft to see if it's holding the butterfly open. Don't unplug the tps, just remove it from the shaft. When you installed your tps did you ensure that it had freeplay either direction of the throttle rotation? The butterfly sits at 4 degrees in the throttlebody and has a range of movement of about 86 degrees. TPS sensors have about 120 dregrees of movement to ensure that the throttle motion is within thier range.

Hope this narrows it down for you!

Last edited by Jim2; 06-17-2007 at 07:25 PM..
Old 06-17-2007, 07:20 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #12 (permalink)