GDI Engine High-Pressure Fuel & Air Intake Service
Engine Repair · Downtown Dubai, Dubai
Heavy carbon deposits accumulated on intake valve stems due to direct injection characteristics and dusty city driving..
Case 16 · Downtown Dubai
2020 Kia Optima GDI
- Response
- 25 min
- Completed in
- 3.0 Hours
- Location
- Downtown Dubai
The vehicle & the brief.
2020 Kia Optima GDI
Rough engine idling, decreased fuel efficiency, sluggish throttle
25 minutes
3.0 Hours
How this case was solved.
A step-by-step breakdown of what we found, what we tested, what we replaced, and what we measured at the end.
- 01
Problem
Heavy carbon deposits accumulated on intake valve stems due to direct injection characteristics and dusty city driving.
- 02
Diagnosis
- 01Borescope camera inspection of intake valves
- 02High-pressure fuel rail pressure test
- 03Live OBD-II fuel trim telemetry log
- 03
Solution
Performed walnut shell blasting carbon clean on intake valves, replaced air filter, and tuned fuel injection parameters.
- 04
Result
Throttle response sharpened, idle speed stabilized at 750 RPM, and fuel economy returned to factory specs.
What we replaced.
Only OEM or dealership-equivalent parts are used. Every part below was installed onsite and is covered by our 12–24 month warranty.
Total parts
02
- 01Engine Air Filter
- 02Fuel System Additive Treatment
Frequently asked questions.
01Why do GDI engines get carbon buildup?
Because fuel is injected directly into the combustion chamber, detergent gasoline never washes over the intake valves, leading to carbon deposits.
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