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Mercury Mountaineer Rough Idle

Learn if it's a simple fix or time to seek out a trusted technician.

What are common reasons my Mercury Mountaineer has a rough idle?

While there are a variety of reasons your Mercury Mountaineer has a rough idle, the most common 3 are a vacuum leak, an issue with the spark plugs, or a problem with the ignition coil.
34%
of the time it's
Vacuum Leak
21%
of the time it's
Spark Plugs
15%
of the time it's
Ignition Coil

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Related Mercury Mountaineer Questions

See what others are asking about their Mercury Mountaineer. Get answers from RepairPal's community of auto experts and enthusiasts.
My mountaineer will not idle in cold weather and once warm it is still rough. there is not a check engine light on. ...
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Related Mercury Mountaineer Problems

Find the most common driver-reported problems that are to blame when a Mercury Mountaineer has a rough idle.
The check engine light will illuminate and the engine will idle roughly when cold. there are updated upper intake man...
The intake manifold o-ring gaskets commonly leak, causing stalling and poor idle quality; the check engine light will...
Mercury Mountaineer Repairs and Prices
All costs based on RepairPal Fair Price Estimate™ averages. Actual prices may change depending on final diagnosis.

Mercury Mountaineer Rough Idle Repair Symptoms

A failing ignition coil can create several symptoms: Check engine light comes on Engine runs poorly or stall Increased emissions Reduced fuel economy Car won’t start I...Read More
When spark plugs fail, the engine will struggle. The check engine light will come on, and it may appear either solid or flashing. The driver would likely notice one or more of t...Read More