VW Fox Diesel Intake Issues Causing Power Loss & Jerking

Had similar symptoms on my VW Polo 1.6 TDI from 2009. The engine light came on during acceleration, accompanied by significant power loss and the characteristic hissing from the air intake system. The diagnosis confirmed a faulty intake manifold with stuck flap control actuators. The airflow control system was not distributing air properly through the manifold runners, causing uneven fuel mixture and poor combustion. This requires replacing the complete intake manifold assembly since the flap control mechanism is integrated. The repair involves: Removing the old intake manifold, Installing new manifold with actuators, Resetting engine management system, Testing airflow control operation This is considered a serious repair as it affects engine performance, fuel efficiency and emissions. The symptoms will worsen if left unaddressed, potentially leading to more extensive engine damage. The repair took about 4 hours at the shop. After replacement, the engine ran smoothly with normal power delivery and fuel consumption returned to standard levels. Would recommend getting it diagnosed soon since these issues tend to deteriorate quickly.

Experienced the exact same issue with my VW last year. The intake manifold failure symptoms matched perfectly, jerky acceleration, weird hissing, high fuel usage. The flap control system was completely stuck, killing engine performance. Got it fixed and running great now with no other problems showing up. My engine light never came back on and power delivery is perfect. Would you mind sharing what the repair cost at your shop? Mine was around 850€ for parts and labor but prices can vary significantly. Did you notice any other issues develop after the intake system repair?

After getting the intake manifold flap control issue fixed at my shop, the total came to 465€ which seems quite reasonable compared to your repair cost. The airflow control system has been working flawlessly since the repair, no engine light, no hissing noise, and power delivery is back to normal. The mechanic actually showed me the faulty intake manifold after removal. The flap control mechanism was completely seized, which explained the poor airflow distribution causing our similar symptoms. Since the repair 6 months ago, fuel consumption returned to normal and the engine runs smoothly across all RPM ranges. No additional issues have developed after fixing the manifold flap system. The shop did a thorough job testing the entire air intake setup to ensure proper operation. Getting this fixed early likely prevented damage to other engine components that could have occurred from the improper air-fuel mixture.

I finally had it repaired last week after dealing with those frustrating intake manifold symptoms. Called around and found a highly-rated diesel specialist shop with good reviews. The mechanic spent time explaining the airflow control system issues and showed me the damaged parts. Repair took about 5 hours total. They replaced the full intake manifold assembly and reset the engine control unit. Bill came to 620€ which included parts and labor. Much better than I expected given the complex nature of the engine misfire issues. One week later and the difference is remarkable. No more hissing noise, smooth acceleration, and fuel consumption back to normal levels. Engine performance is solid across all speeds. Definitely worth fixing it properly rather than trying quick fixes or leaving it to get worse. Really appreciate all the helpful responses here. Having others confirm similar experiences made me more confident about getting the proper repair done.