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BMW 740iL Rough Idle

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

What are common reasons my BMW 740iL has a rough idle?

While there are a variety of reasons your BMW 740iL 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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See what others are asking about their BMW 740iL. Get answers from RepairPal's community of auto experts and enthusiasts.
1998 bmw 740il rough idle when cold, car runs fine when warm removed dip stick and heard gurgling sound.
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Related BMW 740iL Problems

Find the most common driver-reported problems that are to blame when a BMW 740iL has a rough idle.
Engine oil leaks commonly develop from both valve cover gaskets, intake manifold, and pcv plate after about 60,000 mi...

BMW 740iL Rough Idle Repair Symptoms

A failing ignition coil will create misfires in the engine, and lead to hesitation, extreme power loss, engine stalling, poor fuel mileage, and illumination of the check engine ...Read More
As we discussed, spark plugs are necessary for any gasoline engine to run. When they fail, the engine is in a constant state of attempting to ignite air and fuel, but cannot. Th...Read More