A faulty camshaft position sensor can send incorrect readings to the engine computer, triggering 'implausible' codes and causing a rough idle.
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Even without noticeable rattling noises, a stretched timing chain or worn guides can cause the camshafts to fall out of sync with the crankshaft, leading to constant rough idling and timing codes.
Since the VANOS solenoids were already replaced, the mechanical camshaft adjusters (phasers) or their central valves may be failing or stuck, preventing proper timing adjustments.
Damaged wiring or poor connections at the camshaft position sensors or VANOS solenoids can disrupt the signal, causing the computer to read the timing as implausible.
Recent WrenchConnect diagnoses
Rough idle, codes for camshaft implausible shaft implausible
- Possible causes: Camshaft Position Sensor Failure, VANOS Central Valve or Adjuster Failure, Timing Chain Stretch or Jumped Timing, Wiring or Connector Issue
- Recommended specialties: Diagnostics, Engine
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