VW Atlas Power Loss & High Fuel Use, Cylinder Issues

Having experienced similar symptoms with my 2016 VW Touareg TDI, I can relate to this issue. The symptoms you describe match what turned out to be a failing turbocharger in my case, which was causing inconsistent pressure and affecting engine performance. The root cause was actually linked to a cracked intake manifold that went undetected initially. This allowed unmetered air into the system, throwing off the fuel-air mixture and causing the turbocharger to work inefficiently. The check engine light came on due to the pressure variations in the system. While the fuel injectors might be fine, the head gasket should be inspected as these symptoms can also indicate early stages of head gasket failure. In my case, catching the issue early prevented more serious engine damage. This is a serious repair that requires proper diagnosis. Simply clearing codes or quick fixes wont resolve the underlying problem. A compression test should be performed to properly diagnose the cylinder pressure issues, particularly focusing on the turbocharger system and intake components. The concern about inconsistent cylinder pressure suggests its best to address this promptly before it leads to more significant engine damage.

Thanks for sharing your experience with the Touareg. I totally agree this sounds like a turbo-related issue. When my timing belt started giving similar problems last year, I also noticed the power loss and increased fuel consumption. The camshaft readings were off too, which caused inconsistent pressure in the system. After getting it fixed, the engine performance returned to normal. Just wondering, how much did the repair end up costing for your cracked intake manifold and turbo issues? Also, have you had any other problems pop up since the repair was done?

Like I mentioned, my 2016 Touareg had similar symptoms. After properly diagnosing the issue, my mechanic determined the cracked intake manifold had actually caused the turbocharger problems. The repair turned out to be covered under warranty since it was a manufacturing defect, so it cost 0€. The cylinder pressure fluctuation completely resolved after the repair, and engine performance returned to normal. I have had zero issues with the turbocharger or intake system since then. The timing belt and all other components are working perfectly now, with normal fuel consumption and proper power delivery. What really helped was finding a mechanic who took the time to properly diagnose the root cause rather than just treating symptoms. Getting that cracked manifold identified and fixed prevented what could have been serious damage to the head gasket and other engine components. The car runs great now, no check engine lights or performance issues for the past 18 months since the repair was completed.

After all your helpful insights, I finally took my Atlas to a different mechanic last week. The diagnostic showed my turbocharger was indeed failing, causing the power loss and fuel consumption issues. The timing chain tensioner was also worn, affecting the camshaft timing and creating those cylinder pressure problems. The total repair came to 2800€ including parts and labor. While not cheap, it was worth getting it properly diagnosed and fixed. The mechanic also performed a full compression test to ensure there wasnt any damage to other engine components. The car is running perfectly now, fuel consumption is back to normal and the power delivery is smooth again. No more check engine light either. Lesson learned about finding a competent mechanic who actually takes time to diagnose issues properly instead of quick fixes that waste money. Should have done this months ago instead of letting the problem get worse. At least now I know a reliable mechanic for future issues.