Also, the coolant temp is normal now as well. Average failure mileage is 47,900 miles. My 2012 chevy cruze has a rough idle. If the PCV is good and working (check it for vacuum) then I question if there is excessive blow by being caused in the engine due to a compression loss via rings. 1) Enter Any VIN with Free Preview 2) Full VIN Reports Are Now Free. Chevrolet Cruze owners have reported 79 problems related to check engine light on (under the engine and engine cooling category). Most of the time the culprit is going to be the ignition system, although there are a myriad of other causes. Michael T. April 10, 2020 97 Views 1 Answer Keith S. answered on April 10, 2020 if you experience a rough idle with a concurring check engine light on in your 2015 chevy cruze, you may be dealing with a serious vacuum leak, faulty spark plugs or ignition coils. The most recently reported issues are listed below. Hopefully, the check engine light is on. Anyway, it runs mostly fine, save for idle rpm occasionally drops below the standard 800rpm. Search Any Vehicle History using our Free VIN Check and Free Vehicle History. Why is my chevy cruze rough idle no check engine light on? Charles A. April 10, 2020 171 Views 1 Answer Brian M. answered on April 10, 2020 the chevy cruze rough idle no check engine light is on because of a vacuum leak or a faulty ignition coil. What causes my 2015 chevy cruze rough idle check engine light to come on? Chevy Cruze Rough Idle Causes. We’ll cover the most common causes of rough idle below. I'm at the repair shop waiting to see what they tell me - Answered by a verified Chevy Mechanic While there are a variety of reasons your Chevrolet Cruze 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. 2012 cruze. When one or more of these variables is off it can lead to a rough idling condition. Rough idle and check engine light. Okay So recently my chevrolet Cruze 2015 LT gave Check Engine Light and was having rough idle. Every now and then at a stop, the car will get a jumpy rough idle. Helpful Leave your answer Name. I got a 2011 Cruze Eco 1.4t, with 50k miles on, everything stock, save for the tires, and transmission oil change. The 2014 Chevrolet Cruze has 2 problems reported for rough idle and stalling. Check engine light is off and is running normal. Sometimes it's so bad the car will lurch like the engine has a misfire, or the transmission is trying to grip or something. So i went to the dealership and they diagnosed that the PCV Valve had a vaccum leak so i guess the replaced the whole PCV valve. I have a 2015 chevy cruze that has a chec engine light on. Going for brake pads soon as well. An erratic idle can be caused by a vacuum leak, or an idle air control valve. But again, vacuum would be drawing in and not blowing out. 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