Engine Diagnostics
Advanced Engine Fault Diagnosis for Modern & European Vehicles
Engine problems today are rarely simple. Misfires, knocking noises, power loss, rough idle, stalling, or vibration often stem from interacting systems, not a single failed component.
At Green’s Garage, engine diagnostics are performed as a structured engineering process, designed to identify the root cause before any repair is recommended — especially on complex vehicles such as Jeep, Mercedes-Benz, Land Rover, Volvo, and other modern European and specialty vehicles.
When Engine Diagnostics Are Necessary
Engine diagnostics are required when symptoms are:
Intermittent, inconsistent, or load-dependent
Triggering warning lights without clear explanations
Present without fault codes — or with misleading codes
Still unresolved after another shop’s repair attempt
Accompanied by abnormal noise, vibration, or drivability changes
If the cause isn’t obvious, diagnostics come before parts replacement.
Common Engine Problems We Diagnose
Rather than offering “engine repair” as a generic service, we diagnose specific engine failure patterns, each of which can have very different root causes depending on vehicle design.
Engine Misfire Diagnostics
Misfires on vehicles such as Mercedes-Benz, Land Rover, Volvo, and Jeep engines may involve ignition strategy, fuel delivery, variable valve timing, airflow modeling, or mechanical integrity — not just plugs or coils.
→ Engine Misfire Diagnostics
Engine Knock, Ticking & Abnormal Noises
Noises can indicate detonation, timing faults, valvetrain wear, oiling issues, or internal mechanical damage. Identifying where and why the noise occurs is critical before any repair.
→ Engine Knock & Noise Diagnostics
Loss of Power or Hesitation
Power loss may result from airflow restriction, boost control faults, exhaust backpressure, fuel trim errors, or incorrect engine load calculation — especially common on turbocharged and hybrid-assisted platforms.
→ Loss of Power Diagnostics
Rough Idle, Stalling & Engine Shutdown
Idle instability often involves throttle control logic, vacuum integrity, camshaft timing adaptation, or software-controlled idle strategies — particularly on European vehicles.
→ Rough Idle & Stalling Diagnostics
Engine Vibration
Vibration is not always mechanical. It can be combustion-related, cylinder-specific, or dependent on torque management strategies used by brands like Volvo, Land Rover, and Mercedes-Benz.
→ Engine Vibration Diagnostics
Brand-Specific Behavior, System-Based Diagnosis
Different manufacturers design engines with very different control strategies:
Jeep engines often integrate engine performance tightly with networked modules, torque management, and emissions logic
Mercedes-Benz engines rely heavily on calculated load models, adaptive ignition timing, and sensor plausibility
Land Rover platforms frequently combine engine performance with driveline and terrain-response strategies
Volvo engines emphasize efficiency, turbo control, and precise airflow modeling
Our diagnostic approach accounts for how each system is engineered, while remaining focused on observable data and confirmed behavior, not assumptions.
How Our Engine Diagnostic Process Works
Engine diagnostics follow a structured, evidence-based workflow that may include:
Live and recorded engine data (PIDs)
Mode 6 and misfire counter analysis
Oscilloscope testing of sensors, actuators, and ignition components
Mechanical integrity and timing verification
Thermal imaging and temperature correlation
Smoke testing and airflow analysis
Road-load testing under real driving conditions
Every step is chosen to prove or disprove a hypothesis, not to guess the next part.
Why Diagnostics Come First
On modern vehicles — especially Mercedes-Benz, Land Rover, Volvo, and Jeep platforms — replacing parts without confirmation often:
A correct diagnostic process leads to:
Schedule an Engine Diagnostic
If your vehicle has:
An unresolved engine issue
A recurring check-engine light
Abnormal noise, vibration, or power loss
A recent repair that didn’t solve the problem
The correct next step is engine diagnostics, not guesswork.
Schedule a Diagnostic Appointment