2001 Mercury Grand Marquis Q&A
2001 Mercury Grand Marquis Question: Intake manifold replace, crank attempted, loud clunk now car won't crank.
Pull spark plugs and see if it will turn over by hand. - ziptie12
Agree with #1, object or coolant in cylinder(s) and possible connecting rod damage NOW. Try to turn engine in both directions with plugs removed. Did this happen immediately when first cranking engine after the work? - pushrod