I have a 1999 Bonneville with the infamous 3.8 L with 147,000 miles
(has never been apart), but I think my luck just ran out.... After a
100 mile drive and being parked for two days, I started it this
morning (garage was 40 degerees F inside) and it cranked funny / slow
for the first rev or two, when it started it makes a ticking sound
(collapsed lifter??) Kind of loud, and the exhaust has a definite
poof, poof, poof (dead cylinder sound). I know about the coolant
leaking upper intake manifold into the crank case thing, but the oil
looks good. But low and behold I see coolant around the outside at
the throttle body end of the manifold and on the block..... leaking at
the throttle body /
manifold junction I suspect.
My questions: 1) how likely is it that the funny sound / slow crank
was that coolant had leaked into the intake and into a
cylinder(probably somewhat likley), and 2) what damage could I expect
to find (bent connecting rod?? If it was coolant in a cylinder, I am
hoping it forced an exhaust valve closed causing a bent push rod or
the lifter to collapse).
My plan of attack is to pull the valve covers and check for a loose
push rod as a starting point..... then remove the throttle body and
check for signs of coolant on the inside of the manifold... hoping for
a collapsed lifter or bent push rod and no "major" damage (bent
connecting rod, piston damaged, bent valve stem etc.).
Anyone with past experience and would like to share, it would be
greatly appreciated. Thank you ......