black smoke tailpipe emission either during start or idling and continuous after driving. stop sometimes during driving acceleration i feel like some relay in auto shifting and as the engine is under load until black smoke puff exits forcefully from tailpipe at that time. i feel the auto shifting change smoothly and the engine free from distress. what causes of this black smoke black smoke puffing from tail pipe? Why auto shifting delay happens?
Oct 28, 2017 at 12:25 PM
