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larakaiser7

SantaFe diesel engine power loss

Hi, I'm experiencing some issues with my 2004 Hyundai SantaFe diesel. It's got about 97545 km on the clock. Recently, I've noticed a significant reduction in engine power, and the check engine light keeps popping up. The engine runs rough, and there's a noticeable jerking when I try to accelerate. From what I've read, these symptoms might indicate that the engine is running too lean, meaning it's not getting enough fuel. I've checked the throttle body for any obvious obstructions, but it seems clean. Could this be related to a defective injection valve or injector? I haven't touched the spark plugs or the mass air flow sensor yet.

Summary of the thread

A 2004 Hyundai SantaFe diesel is experiencing significant engine power loss, rough running, and jerky acceleration, with the check engine light on. These symptoms suggest the engine might be running too lean, potentially due to a defective injection valve or injector. Possible causes include faulty or dirty fuel injectors and issues with the mass air flow (MAF) sensor. Solutions include checking and possibly replacing the MAF sensor and using a fuel injector cleaner additive, with professional inspection recommended if problems persist. Ultimately, a defective fuel injector was identified and replaced, resolving the issue.

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4 comment(s)

david_smith1

Hey there! Your problem sounds familiar. I had similar issues with my old Opel Astra, although it was a petrol engine. Reduced power, the dreaded check engine light, and jerky acceleration – the whole shebang! It could definitely be a fuel issue. A lean condition basically means your engine isn't getting the right air-fuel mixture. The engine control unit (ECU) uses readings from various sensors to calculate the amount of fuel to inject. A faulty injector, or dirty fuel injectors, could be the culprit, like you said. Also check the mass air flow (MAF) sensor, as it is responsible for measuring the amount of air entering the engine. A faulty MAF can cause the ECU to miscalculate the required fuel.

larakaiser7 (community.author)

Thanks for the insight! I'm not too familiar with the MAF sensor. Where is it located, and is there a simple way to test it before I start replacing parts? Also, you mentioned dirty fuel injectors. Is there a way to clean them without taking everything apart? I'm trying to avoid a costly repair if possible.

david_smith1

Alright, so the MAF sensor is usually located in the air intake, between the air filter box and the throttle body. It's pretty easy to spot – just look for a sensor with a wire connector plugged into the intake piping. As for testing, there are some DIY methods using a multimeter to check the sensor's voltage output, but honestly, unless you're comfortable with electrical testing, it might be best to leave that to a professional. Regarding the fuel injectors, you can try using a fuel injector cleaner additive that you pour into your fuel tank. Some people have had success with those. However, if the problem persists, it's probably best to take it to a workshop. It does sound like you have an injector issue.

larakaiser7 (community.author)

Thanks a lot for your help and advice! I took it to a local workshop, and they confirmed that one of the fuel injectors was indeed defective. They replaced it, and the engine now runs smoothly. The total repair cost was around 515€. I really appreciate your input!

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HYUNDAI

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SANTAFE