Suzuki Spacia Intake Leak Symptoms and Solutions

I dealt with very similar symptoms on my 2015 Suzuki Swift last year. As someone with some experience working on cars, I initially thought I could diagnose it myself, but the check engine light convinced me to seek professional help. The symptoms matched yours exactly, increased fuel consumption, hissing noise, and performance issues. The workshop performed a vacuum leak test and discovered a cracked air intake hose near the throttle body. These rubber hoses can deteriorate over time, especially if exposed to high engine temperatures. The complete diagnostic and repair process included: Full system leak detection test, Inspection of all vacuum hoses, Air filter check, Replacement of the damaged intake hose, Computer reset to clear the check engine light Total cost was 100€ and the car has been running perfectly since. The repair took about 2 hours. Before suggesting more specific advice, could you share: Current mileage on your Spacia, When was the last full service done, Any modifications to the intake system, Whether the hissing sound changes with engine RPM This would help determine if your issue is identical to what I experienced or if there might be other factors to consider.

Latest service was 2 weeks ago at 64000km where they performed the regular maintenance items. The vacuum leak test they did showed no issues at that time. The hissing sound and check engine light started appearing just 3 days ago. Have not modified any engine components. The engine misfire symptoms seem worse in the morning when the engine is cold. The hissing noise definitely increases with RPM and is most noticeable during acceleration. Based on your experience, I will ask them to specifically check the air intake connections near the throttle body area since the symptoms match so closely with what you described.

Thanks for the additional details. Your symptoms being worse during cold starts, combined with the RPM-dependent hissing, strongly suggest a vacuum leak that has developed very recently, possibly after that last service. In my case with the Swift, I learned that sometimes vacuum leaks can develop suddenly, even right after a service. The technician might have inadvertently stressed a weak hose while working on something else. On my car, they actually found that a vacuum hose near the intake manifold had been slightly pinched during the previous service, which eventually led to a small tear. The cold start issues you mention are particularly telling, my car showed the same pattern. The ECU struggles more to compensate for air leaks when the engine is cold, which explains the more noticeable symptoms during morning starts. Since your turbocharger was serviced 6 months ago, also have them check all the connections and clamps around the turbo housing. The high pressure in turbocharged systems can make small leaks more problematic and cause that characteristic hissing sound youre hearing. Quick tip: Ask them to do a smoke test rather than just a standard vacuum test. This helped spot the tiny leak in my case that the regular vacuum test missed.

Based on the conversation flow, here is an appropriate final response from the initial poster's perspective: Thanks for the detailed feedback. You might be onto something about the recent service potentially affecting the vacuum system. I just called the workshop and scheduled an appointment for tomorrow morning. I specifically requested a smoke test for the vacuum system and made sure to mention checking the connections around both the throttle body and turbo housing. The air intake symptoms you described with your Swift match mine exactly, especially the cold start issues and RPM-dependent hissing. Having this information will help ensure the technicians focus on the right areas first. I will ask them to pay special attention to any hoses that might have been disturbed during the recent service. Will update once they diagnose the exact cause, but feeling more confident now about the potential source of the engine misfire. Really hoping its just a simple vacuum hose issue like in your case rather than something more serious with the turbocharger system itself.