1. Fuel Delivery and Combustion Issues:
* Fuel Injectors: Even though they are brand new, a faulty injector can cause smoking and pinging.
* Check for leaks: Ensure all injectors are properly seated and free of leaks.
* Verify injector operation: A mechanic with a scan tool can monitor injector operation and confirm proper injection timing and fuel delivery.
* Fuel Pressure Regulator: A faulty fuel pressure regulator can cause inconsistent fuel pressure, leading to poor combustion and smoke.
* Check for leaks: Inspect the regulator for leaks.
* Check fuel pressure: A mechanic can measure fuel pressure to see if it's within spec.
* Fuel Pump: A failing fuel pump can't deliver enough fuel, creating the same issues as a faulty regulator.
* Listen for noise: A failing pump may make unusual noises.
* Measure fuel pressure: As with the regulator, a mechanic can measure fuel pressure.
* Spark Plugs & Wires: While you didn't mention these, worn spark plugs or faulty wires can lead to misfires, causing pinging and smoke.
* Timing: Incorrect ignition timing can also contribute to combustion problems.
2. Oil Consumption:
* Valve Stem Seals: Worn valve stem seals allow oil to leak into the combustion chamber, leading to blue smoke.
* Pistons & Rings: Damaged piston rings or worn cylinder walls can result in oil consumption and blue smoke.
* Oil Pan Gasket: If you're seeing oil leaks around the pan, it's possible oil is getting onto the exhaust manifold, creating smoke.
3. Exhaust System:
* Exhaust Manifold: A leaking exhaust manifold can let oil fumes into the exhaust, causing smoke.
* Catalytic Converter: A clogged or damaged catalytic converter can create back pressure and cause smoke.
* Exhaust Gas Recirculation (EGR) Valve: While you replaced the valve, make sure the EGR system is functioning properly.
4. Other Considerations:
* Engine Temperature: Is the engine running at the correct operating temperature? A cold engine can cause smoke during startup.
* Driving Conditions: If the smoking only occurs during specific driving conditions (like hills or acceleration), it points towards a specific problem.
Troubleshooting Steps:
1. Start with the Basics: Perform a thorough inspection of the engine bay for leaks, loose connections, or visible signs of damage.
2. Check the Engine Codes: Scan the engine for trouble codes using a scan tool.
3. Consult a Mechanic: If you can't pinpoint the issue, consult a qualified mechanic. They can use specialized tools and knowledge to diagnose the problem.
Remember:
* Document everything: Take notes on when the smoke appears, the color of the smoke, and any other symptoms. This will help the mechanic narrow down the possibilities.
* Be Safe: If you smell gas or see oil leaks, do not start or drive the vehicle until it's inspected.
I hope this information helps you get to the bottom of the smoking and pinging!
