Originally Posted by goldfinger22
no leaks or seeps anywhere that I can see.To pull the throttle body do I hav to remove anything but the bolts ? And im looking inside around the pipe to see if its dry/wet ?
Here'* some background info that might help you.
The original design up to 2003 (someone mentioned 2005, but I remember the fix being made after 2003, can someone clarify), was defective by nature. You essentially have an EGR hose on the driver'* side that goes into the lower intake manifold. From the lower intake manifold, a stovepipe protrudes out. When you put the upper intake manifold on top, the stovepipe basically pushes the EGR gasses back into the intake. However, because the stovepipe is in direct contact (or extremely close) with the upper intake manifold, it tends to overheat the plastic there, which over time becomes brittle and cracks. Coincidentally, that'* exactly where the throttle body coolant passages are.
This is the image of the stovepipe when you pull the throttle body:
Here'* the view of the upper intake manifold from underneath. The middle pipe is where the EGR stovepipe goes through, and the two around it are the coolant passages.
As you can imagine, if the plastic cracks there, you can drain all of your coolant very quickly. The replacement manifolds have a revised stovepipe design that leaves some space between the plastic.
2005 Pontiac Bonneville GXP - For Sale ----- 1995 Buick Regal GS(X) - L67 madness
2000 Buick Regal GSE - Stock...for now
----- 1987 Jaguar XJ-* V12 - 12>8