Pontiac Bonneville Problem Report
Pontiac Bonneville Intake Manifold Gaskets Can Develop Engine Oil Leaks
The intake manifold gaskets can develop external engine oil or coolant leaks. The intake manifold will need to be removed and the gaskets replaced to correct this issue. In some cases the plastic intake manifold my be damaged requiring replacement.
Intake manifold leaking oil. - Visitor
Loosing antifreeze from reservoir - Visitor
Service engine light came on at 137500 miles. Car was diagnosed,will be fixed next week. - Visitor
Slight loss of coolant (but no visible external signs). Recent issues with engine "bucking" when warmed up. Diagnosed at shop, will have gasket (s) replaced. - Visitor
Noticed antifreeze level kept dropping. Would only see tiny amount on driveway not enough to explain amount being lost. Checked hoses, radiator, antifreeze holding tank no obvious leaks. noticed moisture on inside of oil fill cap. Went for annual inspection, mechanic found where antifreeze was leaking at top of engine and running onto exhaust burning most of it up before hitting the ground. Found upper and lower intake gaskets leaking. Replaced both - Visitor
Coolant was leaking, had the upper intake manifold replaced - dw26
Oil leak on top of engine from vale covers. - Visitor
I have had a slight oil leak for quite a while, and it seems to correlate with this common problem. - Visitor
Changed the plastic cover and the seal working good - Visitor
Noticed sweet smell at first, then burnt oil on engine block. Rough idle, white smoke out of exhaust. No milky oil though yet. Hoping to get it fixed next week. - Visitor
Intake Manifold gasket leaks. - Visitor
Lowqer intake manifold gaskets failed. Replaced with FelPro MS 98014 T. Upper intake manifold (Plenum) failed EGR tube. Replaced with Dorman 615-180. - Visitor
Leaking fluids. Took vehicle to Skinner and they diagnosed plastic manifold gaskets leaking. - Visitor
not fixed yet - Visitor
Non-metallic manifold needed replacing. Mechanic said something similar about engine freezing due to leak. Cost is quoted around $500 parts & labor. - Visitor
coolant leak, intake manifold - Visitor
replaced upper and lower gaskets plemum elbows flushed cooling system changed oil and filter 3 times about $800.00 - Visitor
By the time I learned of the problem with the intake manifold gasket it was too late and had already caused damage. I ended up haveing to replace the crank and bearings. ugh! - Visitor
Intake manifold gasket failed. So much water entered 3 cylinders it developed hydro-lock conditions as if the engine was seized. Complete gasket replacement for upper and lower intake manifolds was necessary. - Visitor
The Dextron cooling liquid GM used on all engines was the cause of gasket leaks. GM lost a class action suit on this issue. They would not acknowledge their fault in my case and I had to pay and repair it on my own. - Visitor
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smell antifreeze when the car runs and slowly losing antifreeze. nothing in the oil.