- Buick Ownership
- 2000 Buick LeSabre Custom
You said 2005, but that photo is looking more like a 1995...Just bought a 2005 with 51,000 miles . Has a full dealer service history , and yes the intake gaskets were replaced .
Poor design and bad choice of material. If you flip the upper intake over by the throttle body there are three holes, the one in the middle is from the egr, the two on the sides are for coolant. The heat from the egr tube causes the sidewalls to deteriorate over time and eventually, coolant will seep, and eventually pour, if not found right away, into the intake causing it to vapor lock the cylinders. They're great motors, I have a PA but same 3800 it has 278,000 still sounds great. It's always something with plastic and GM that causes problems. In the pre series II 3800s some of the timing chain gears had a poly-something or other coating over the teeth of the gears, Eventually the plastic wears away, you have to replace oil pump & screen, and the gears and chain, almost makes you think they design it in such away that it can run great for so long, and then boom catastrophic failure, and only because of 1 plastic piece.I'm not sure what is the cause of these intake plenum leaks