Jamz3k 0 Report post Posted November 9, 2011 I noticed a few weeks ago that when i switch off the aircon in my 147 the idle becomes lumpy although the revs don't seem to rise or fall at all during the lumpiness? Any ideas? Quote Share this post Link to post Share on other sites
Smaky 73 Report post Posted November 10, 2011 I would think that you have a sticky breather valve and the extra strain on the engine during A/C operation is preventing it from hunting. Replacing the valve may solve this and there is a guide with part numbers in the Engine section. Quote Share this post Link to post Share on other sites
Jamz3k 0 Report post Posted November 10, 2011 cheers smaky, does this have any adverse affect on driving the car until I fix it? Quote Share this post Link to post Share on other sites
Smaky 73 Report post Posted November 10, 2011 If you run with A/C on then it'll use more fuel. Quote Share this post Link to post Share on other sites