VW Suran Engine Hesitation & Check Light Fix Guide

Having similar experience with my 2018 VW Golf (also with a gasoline engine), I can share my story as someone with moderate experience in car maintenance. The symptoms you describe match exactly what I encountered, sluggish acceleration and check engine light. After basic checks of the air intake and throttle body, my mechanic found the root cause was a defective hose connection between the fuel pump and valve. The manifold pressure was affected due to this small but significant issue. The repair involved: Complete diagnostic check, Replacing the damaged hose connection, Testing the air supply system, Final check of engine performance Total cost was 175€ and completely resolved the hesitation issues. The engine response returned to normal immediately. Before suggesting this might be your exact issue, could you provide: Current mileage, Any recent maintenance work, Specific engine size, Any additional warning lights, Whether the check engine light is constant or intermittent These details would help determine if your situation matches what I experienced and ensure the solution is appropriate for your case.

Had my last service at 75870km and they cleaned the throttle body and checked all vacuum lines. After that, I noticed similar symptoms again. A diagnostic scan revealed P0171 code, suggesting a lean fuel mixture. Based on my research, this could point to a vacuum leak somewhere in the intake system. The engine hesitation is more noticeable during cold starts. Im thinking a faulty manifold pressure sensor or deteriorating vacuum lines might be causing my idle problems. Going to get it checked again but wanted to know if cleaning the air intake helped in your case before I spend more money on diagnostics.

Thanks for the additional details. Your P0171 code actually mirrors what I experienced with my Golf before discovering the full extent of the issue. While cleaning the air intake provided temporary improvement, it didnt resolve the root cause in my case. The vacuum hoses deteriorate over time, and after my initial repair, I learned that multiple vacuum lines needed attention. The manifold pressure readings were inconsistent, indicating leaks in the air supply system that werent immediately visible during the first inspection. The cold start symptoms you mention are particularly telling, this was exactly how my issue presented before the complete fix. The lean condition often worsens in cold weather because the compromised vacuum hoses become less flexible. What worked for my Golf: Full vacuum system pressure test, Replacement of three degraded vacuum hoses, New manifold pressure sensor, Recalibration of the air supply system Total additional cost: 320€ Since your mileage is close to when I had these issues (I was at 73000km), and considering the similarities in symptoms, I strongly recommend getting the vacuum system thoroughly tested rather than just cleaning the intake again. The engine stalling during cold starts cleared up completely after addressing these components. The investment in proper diagnosis saved money in the long run by preventing further air supply issues.

Thanks for the detailed breakdown. Your experience with the vacuum system matches my suspicions, especially since my symptoms mirror what you went through. The cold start issues and lean condition make more sense now, considering how vacuum hoses can deteriorate. Your mention of multiple vacuum leaks affecting manifold pressure really clicked with my situation. I called my regular shop and scheduled a complete vacuum system test for next week. Will have them check all vacuum hoses and the manifold pressure sensor while theyre at it. The 320€ repair cost seems reasonable if it fixes these idle problems for good. Its better than keep throwing money at partial fixes like cleaning the air intake system. Will update once I get the results from the pressure test. Really helpful to know what specific components to have them inspect, particularly those vacuum lines that might be causing the lean condition.