Audi shakes at idle, hydraulic tappet rattles on the throttle. What exactly is the fault?
Troubleshooting process
Failure code analysis: total speed jitter, fuel door hydraulic tappet noise, VAS5052A query fault memory, engine control unit 1-4 cylinders have misfire records, while there is a non-illuminable static fault code 00022 (camshaft position sensor G40/engine speed sensor incorrectly assigned);
According to the fault phenomenon and its fault code analysis, the preliminary judgment:
(1) Tensile failure, misalignment of the timing chain;
(2) The intake camshaft adjustment solenoid valve affects the ignition advance angle.
Disassembly of the intake camshaft adjustment solenoid valve revealed that the plunger had failed, resulting in a misalignment of the intake valve adjustment and causing the above malfunction.
Failure cause analysis
This car’s oil consumption is large, every 5000 kilometers or so the need to add oil, this time driving nearly 7000 kilometers did not refill the oil, pull out the oil ruler to check the oil level oil ruler has long been unable to reach the oil level. Determine the reason for the failure may be the amount of oil is low, in the engine startup, the oil pressure can not reach the normal working pressure in time, caused by the intake camshaft adjustment solenoid valve plunger failure, resulting in the intake valve adjustment mismatch, the engine total speed shaking.
Troubleshooting
Replace the intake camshaft adjustment solenoid.
Case Review and Recommendations
Timing mechanism using chain drive, transmission efficiency is higher than the timing belt, if the timing chain is misaligned, it will cause valve interference, resulting in bending deformation, and the vehicle can not be started.
In the case of the vehicle starting normally, the timing sensor fault code, this kind of failure is a preliminary judgment for the intake camshaft valve adjustment failure or tightener failure.
shanhedongli provides one-stop engine solutions, our advantages are:
- Factory inspection service: To certify the quality of the product, instead of factory inspection or reception factory inspection, the major brands of factories can do a long-term job.
- Become your engine industry contacts in China to save your time, material, and human resources and fast and long-term links to major well-known automotive brand factories.
- OEM has a factory that can help your engine mass production, modification, restructuring, or customization.
- Finding difficult parts.
- Mass production and stable supply. Sincerely looking for overseas distributors, if you need them, please contact us!
