More than the customer would desire Smoke (Black)
WARNING: This page is about a different car, the 2019 GMC Savana 3500, 2019 GMC Savana 2500, 2019 Chevrolet Express 3500, and 2019 Chevrolet Express 2500. However, it is still accessible from the selected car via links, so may be relevant.
Normal Operation
- During light to moderate acceleration there should be no black smoke.
- During the 2 - 3 hard accelerations after normal light load driving there may be some black smoke momentarily but should not last for greater than 5 s.
- During hard acceleration there may always be a very faint puff of black smoke.
Abnormal Operation
- Black smoke during light to moderate acceleration
- Heavy black smoke during hard acceleration that lasts for greater than 5 s
- Heavy black smoke during every hard acceleration and/or during transmission shift transitions
- Inspect for an air leak in the charge air cooler or the air ducts between the turbocharger and the intake manifold.
- Inspect for a restriction in the turbocharger charge air cooler.
- Inspect for a restriction in the intake manifold.
- Inspect that the EGR valve is fully closing. Remove the EGR valve and visually inspect that there is no light seen between the valves and the valve seats.
- Ensure that the EGR valve does not bind when manually moving the valve.
- Inspect for more than the customer would desire oil entering the combustion chamber.