ClaraBraunFan

Trajet air intake leak

Experiencing higher fuel consumption and a check engine light on my 2004 Hyundai Trajet, gasoline engine. There's also a loud hissing sound when I accelerate. My code reader indicates an air intake system leak, but I can't pinpoint the location. Has anyone else encountered something similar with their Trajet?

The conversation revolves around a 2004 Hyundai Trajet experiencing higher fuel consumption, a check engine light, and a loud hissing sound, indicating an air intake system leak. The problem was identified as a cracked intake hose, causing unmetered air to disrupt the fuel-air mixture. The suggested solution was to inspect the intake manifold and eventually take the car to a workshop for a smoke test. The issue was resolved by replacing the intake hose, restoring normal fuel economy and eliminating the warning lights.

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4 comment(s)

I had a similar issue with my old Volvo V70. Increased fuel consumption, check engine light, and hissing were almost identical symptoms. For me, it turned out to be a cracked intake hose. The hissing was the sound of unmetered air rushing in, messing with the fuel-air mixture and triggering the engine light. Have you checked the intake manifold as well?

Thanks for sharing that. I focused my inspection on the visible hoses. Where exactly on the intake manifold should I be looking for potential leaks? I want to be sure before I bring it into a workshop.

On my Volvo, the crack was on the underside of the intake hose where it connects to the manifold, making it difficult to see without removing it. Given your symptoms and the age of your Trajet, it wouldn't surprise me if you had the same problem. At this point, I advise you to take your car to the workshop. They will perform a smoke test and pinpoint the leak with professional tools.

Appreciate the insights; very helpful. Following your experience and advice, I took my Trajet to a trusted workshop. As you correctly suspected, the intake hose had a significant leak. Replacing the hose cost me around 100€, and the car is now running smoothly again. Fuel economy is back to normal, and no more warning lights!

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HYUNDAI

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TRAJET