Spacefox VANOS Issue Causing Fuel Waste and Power Loss

I experienced nearly identical symptoms with my 2009 1.6L Spacefox CrossFox. The check engine light appeared along with sluggish acceleration and increased fuel consumption. After proper diagnosis, it turned out to be a faulty VANOS solenoid valve on the intake side. The issue was causing improper valve timing, leading to an engine misfire at lower RPMs. When the VANOS system fails, it cant properly adjust valve timing, seriously impacting engine performance and efficiency. In my case, the solenoid was clogged with oil sludge, a common problem if oil changes arent done regularly. This required removing the valve cover to access and replace the VANOS solenoid. The timing chain area was also inspected during the repair since these components work together. Its not a quick roadside fix, but its also not among the most serious engine repairs. The symptoms you describe match the typical VANOS failure pattern. Getting it fixed sooner prevents additional engine stress and continued poor fuel economy. Make sure the shop has experience with variable valve timing systems, as proper diagnosis and repair requires specific knowledge.

Thanks for sharing your experience. My car got fixed about 3 months ago and runs smoothly now. Had the same low power issues and engine misfire problems you described. The mechanic found oil sludge buildup in the VANOS unit, which explained the check engine light and poor performance. Just wondering, do you remember roughly what you paid for the full repair? Mine came to around 650€ including parts and labor. Also curious if youve had any related issues pop up since getting it fixed? Sometimes these timing system problems can affect other components.

Had my repair done last month and it cost 250€ total. The mechanic found a defective camshaft solenoid valve in the inlet VANOS system that needed replacement. The variable timing unit itself was thankfully not damaged, just the solenoid component was faulty. No issues since the fix, engine runs perfectly now with proper power delivery at all RPMs. The check engine light has stayed off and fuel consumption is back to normal. Having a mechanic experienced with VANOS failure diagnosis made a big difference in getting it fixed right the first time. Your repair cost sounds higher likely because more components needed attention. These systems can develop oil sludge buildup over time which sometimes requires more extensive cleaning or parts replacement beyond just the solenoid valve. Regular oil changes with the correct grade oil help prevent these issues from recurring.

I finally got it sorted after doing some research based on the helpful replies here. Took it to a specialized shop that actually knew what they were doing with variable timing systems. Total bill came to 650€ but it was worth every cent. The mechanic showed me the old parts, the VANOS solenoid was completely gunked up with oil sludge. No wonder the check engine light came on and the engine felt so weak. They cleaned out the whole VANOS assembly, replaced the solenoid, and checked the timing chain while they were in there. Three months later and the car runs like new. No more low power issues, fuel economy is back to normal, and the check engine light has stayed off. Really glad I got it fixed when I did instead of driving around with poor performance. Going forward, Im sticking to strict oil change intervals with the recommended oil to avoid another buildup problem. The mechanic mentioned this is pretty common on these engines if maintenance gets delayed.