VW Transporter Timing Issue Spikes Fuel Usage

Had the same issue with a VW Golf GTI 2008 last season. The check engine light came on along with rough idling and increased fuel consumption. After diagnostic testing, it turned out to be a failing inlet camshaft solenoid valve affecting the variable timing system. The repair involved replacing both the solenoid valve and its wiring harness since corrosion had damaged the electrical connections. This is a known issue that can cause low power output and timing chain problems if left unaddressed. The variable timing system is crucial for proper engine performance and fuel efficiency. The job requires specific diagnostic equipment to properly test the solenoid resistance values and timing adjustments. A generic OBD reader wont give enough detail to confirm the exact fault. Its important to have this fixed soon as continued operation can lead to more serious engine damage. The repair took about 4 hours in total, mostly due to the tight access to the solenoid components. This isnt a typical DIY job due to the specialized tools and calibration needed after replacement.

Thanks for sharing your experience with the VANOS solenoid repair. I actually had similar symptoms on my Transporter T5 earlier this year, poor fuel economy and the dreaded check engine warning. Your description of the inlet camshaft issues matches what my mechanic found. Do you remember roughly how much the repair cost in your case? Would be helpful to know what to expect. Also curious if youve had any related problems since the fix? My previous repairs on the variable timing system werent great, so Im a bit cautious about where to take it this time.

The complete repair at my trusted workshop came to 250€, covering both parts and labor to fix the faulty VANOS solenoid. Since getting the inlet camshaft solenoid valve replaced, my variable timing system has worked flawlessly. The fuel consumption returned to normal and the check engine light hasnt appeared again. The mechanic found corrosion in the power supply wiring which was causing intermittent VANOS failure. They did a thorough job cleaning the connections and replacing damaged components. This common issue often gets missed during basic servicing but can lead to oil sludge buildup if not addressed properly. Its been running perfectly for 8 months now with no timing issues or warning lights. The investment was worth it to prevent more expensive engine damage down the line. Just make sure your mechanic has the right diagnostic equipment to properly test the VANOS system after repair.

I took my Transporter to ABC Auto last week after reading your helpful insights. Really glad I did, they found exactly what you described with the inlet camshaft system. The mechanic showed me how the old solenoid had corroded contacts and explained why this was causing my variable timing problems. The repair cost was slightly higher at 320€ but included a full system diagnostic and timing calibration. They had the right equipment to properly test the VANOS operation and even showed me the before/after fuel consumption readings. Been driving for a few days now and the difference is clear, no more check engine light, engine runs smoother, and fuel economy is back to normal. The low power issues are completely gone. Definitely worth fixing rather than risking more serious engine damage. Thanks again for pointing me in the right direction with this. Wouldnt have known what to look for without your detailed explanation of the variable timing problems.