AlBeckRacer

Lexus LX Cylinder Pressure

I'm having an issue with my 2008 Lexus LX diesel. I've noticed cylinder pressure fluctuation, increased fuel consumption, reduced engine power, and the check engine light is on. The car has 120732 km. I suspected piston rings or the turbocharger. Could a faulty fuel injector cause this? Could it be engine knocking or a misfire, even though it's a diesel? Is it possible this is a consequential error?

The conversation revolves around a 2008 Lexus LX experiencing cylinder pressure fluctuation, increased fuel consumption, reduced engine power, and an illuminated check engine light. Initial suspicions included issues with piston rings, the turbocharger, or a faulty fuel injector. After using an OBD-II scanner, the error codes pointed to a generic cylinder pressure imbalance. A professional diagnostic revealed the problem was due to a faulty sensor in the intake manifold, which was replaced, resolving the issue under warranty.

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4 comment(s)

I own a Lexus LX as well and experienced something similar. Cylinder pressure fluctuation is tricky. Did you notice any unusual sounds, like hissing or whistling, that might point to a vacuum leak? Have you scanned the engine for error codes using an OBD-II scanner? Knowing the code will help narrow down the causes. It could be a sensor issue causing the fluctuation reading. Checking the air filter is a good starting point. Get those error codes read!

I used an OBD-II scanner and the error codes are generic, pointing towards a cylinder pressure imbalance. I've not noticed unusual sounds, but I will pay closer attention. Did your error codes point towards a general imbalance, or were they more specific? Could a sensor issue alone cause all the symptoms, considering the car's mileage?

In my case, the initial codes were also fairly generic, indicating a potential issue with the fuel system. Because of that, I started looking at injectors and the fuel pump. Given the generic nature of your codes and the mileage, it might be wise to have a professional conduct a thorough diagnostic examination. It sounds like it may be beyond simple fixes if multiple cylinders are showing this imbalance. It's best to catch it early rather than risk further damage.

I appreciate your help! I followed your advice and took it to the workshop. As it turned out, the pressure fluctuation was due to a faulty sensor in the intake manifold. The mechanic replaced it and reset the computer. The light is now off, the car runs perfectly, and the final repair cost was 0€ as it was still under warranty!

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