Jelio
Audi RS6 engine problems - instability and power loss
(Translated from Bulgarian)
Summary of the thread
A 2017 Audi RS6 with 170,000 km is experiencing engine misfires and power loss when warm, with the check engine light flashing and the TCE indicator lighting up. Initial suggestions include checking the fuel injectors, coolant temperature sensor, and crankshaft position sensor, as these components can cause misfires when faulty. The Mass Air Flow (MAF) sensor is also recommended for inspection and cleaning, as it can affect the air-fuel mixture and lead to similar issues.
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11 comment(s)
Jelio (community.author)
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Start by checking the fuel injectors for any clogs or issues, as they can cause misfires when the engine is warm. You can try using a fuel injector cleaner to see if it improves the situation. If the problem persists, it might be worth having a professional inspect the fuel system. Let me know how it goes or if you have any further questions!
Thank you for the answer, I will check this too. It does this when it's warm, then it might clear with diagnostics, and it appears the next day or it depends how much I've driven.
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CarlyMechanic
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Thank you for the answer, I will check this too. It does this when it's warm, then it might clear with diagnostics, and it appears the next day or it depends how much I've driven.
Consider checking the engine's coolant temperature sensor as well. A faulty sensor can send incorrect signals to the engine control unit, affecting fuel mixture and causing misfires when the engine is warm. If you have any further questions or need more assistance, feel free to ask!
Jelio (community.author)
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Consider checking the engine's coolant temperature sensor as well. A faulty sensor can send incorrect signals to the engine control unit, affecting fuel mixture and causing misfires when the engine is warm. If you have any further questions or need more assistance, feel free to ask!
She said that after the check engine light comes on, it runs unevenly, as if it's on fewer cylinders. I'll check that sensor. Thanks. After we clear the error, it starts and runs normally, and after a few hours it does it again when starting a warm engine.
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Jelio (community.author)
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She said that after the check engine light comes on, it runs unevenly, as if it's on fewer cylinders. I'll check that sensor. Thanks. After we clear the error, it starts and runs normally, and after a few hours it does it again when starting a warm engine.
And the diagnostics record cylinders
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CarlyMechanic
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She said that after the check engine light comes on, it runs unevenly, as if it's on fewer cylinders. I'll check that sensor. Thanks. After we clear the error, it starts and runs normally, and after a few hours it does it again when starting a warm engine.
Check the condition of the crankshaft position sensor. A failing sensor can cause intermittent misfires and uneven running, especially when the engine is warm. If the sensor is faulty, it may not provide accurate readings to the engine control unit, leading to the issues you're experiencing. Let me know if this helps or if you have any other questions!
CarlyMechanic
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And the diagnostics record cylinders
Check the condition of the crankshaft position sensor. A failing sensor can cause intermittent misfires and uneven running, especially when the engine is warm. If the sensor is faulty, it may not provide accurate readings to the engine control unit, leading to the issues you're experiencing. Let me know if this helps or if you have any other questions!
Jelio (community.author)
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Check the condition of the crankshaft position sensor. A failing sensor can cause intermittent misfires and uneven running, especially when the engine is warm. If the sensor is faulty, it may not provide accurate readings to the engine control unit, leading to the issues you're experiencing. Let me know if this helps or if you have any other questions!
We replaced the high and low pressure fuel pumps. The car had no problems all day. I left it for an hour, and the check engine light came on again. It's not changing RPMs or stalling, but it's running on fewer cylinders, and it clears up when we give it gas.
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Jelio (community.author)
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We replaced the high and low pressure fuel pumps. The car had no problems all day. I left it for an hour, and the check engine light came on again. It's not changing RPMs or stalling, but it's running on fewer cylinders, and it clears up when we give it gas.
My mechanic says he suspects the oil pump. What do you think about that?
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CarlyMechanic
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We replaced the high and low pressure fuel pumps. The car had no problems all day. I left it for an hour, and the check engine light came on again. It's not changing RPMs or stalling, but it's running on fewer cylinders, and it clears up when we give it gas.
Before considering the oil pump, check the Mass Air Flow (MAF) sensor. A dirty or faulty MAF sensor can cause incorrect air-fuel mixture readings, leading to misfires and rough running. Try cleaning the MAF sensor with a specialized cleaner and see if it improves the situation. If the issue persists, it might be worth further investigation. Let me know how it goes or if you have more questions!
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RS6
CarlyMechanic
Start by checking the fuel injectors for any clogs or issues, as they can cause misfires when the engine is warm. You can try using a fuel injector cleaner to see if it improves the situation. If the problem persists, it might be worth having a professional inspect the fuel system. Let me know how it goes or if you have any further questions!