Car Problem Reports
Mercury Mountaineer Rough idle when cold due to upper intake manifold gasket leak
Mercury Mountaineer Problem
Engines Affected: 4.0L V6, 4.0L V6 SOHC, 5.0L V8
Average Mileage: 182,300 mi (158,000 mi - 206,600 mi)
Visitor, 1999 Mercury Mountaineer, 5.0L V8, 206,600 mi
High idle (approx. 1700 rpms)and check engine light came on.
Had it diagnosed, shop said it was due to leak at manifold gasket. Idle increased to compensate for the leak. Repair estimate - $400
I was told in my case it is not a bad leak and can be delayed until it gets worse.
I will wait.