Can A Bad Battery Connection Cause Rough Idle. Discussion Starter 1 Oct 3 2013. Your battery will not cause the vehicle to run rough.
The bad earth faultcode points me in the direction of the battery because its a bad one. Joined Feb 18 2006. But not a miss fire rough idle.
This condition can further lead to lean fuel.
But once you give it some gas it. Rough idle is usually cause by fuel system problems. The bad earth faultcode points me in the direction of the battery because its a bad one. One more thing I forgot to mention that can cause a rough idle with a 40L that has the newer DIS distributorless igntion system is if someone installed single-tipped platinum plugs.
