More than the customer would desire Smoke (Black)

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.