Advanced Diagnostics & Performance Health Checks
Specialist Vehicle Diagnostics | Fault Investigation | Performance Assessment
At STealthwerx Performance, we take a methodical, data-driven approach to vehicle diagnostics and performance assessment.
Modern vehicles rely on increasingly complex electronic management systems, and not every mechanical or performance-related issue will trigger a warning light or store a diagnostic trouble code.
Our approach goes beyond conventional fault-code scanning. By combining specialist diagnostic equipment, real-time data analysis, controlled road testing and mechanical inspection, we aim to identify underlying problems rather than simply treating their symptoms.
Whether your vehicle is standard, modified, experiencing an unexplained running issue or being considered for performance tuning, our diagnostic and health check services provide a structured assessment of its operating condition.
STealthwerx Performance Health Check
From £100 + VAT | Initial assessment
Our Performance Health Check is designed to provide a detailed overview of your vehicle's mechanical and electronic operating condition.
It is particularly suitable for owners of performance vehicles, modified cars, recently purchased vehicles or those considering ECU calibration and performance upgrades.
What's included?
Our initial assessment typically includes:
Electronic diagnostics: A diagnostic scan of relevant vehicle control systems, including stored, pending and historic fault codes where supported.
Live engine data analysis: Assessment of key operating parameters, including fuel trims, lambda control, boost pressure, airflow, fuelling and ignition behaviour, where applicable.
Controlled datalogging: Recording and analysis of engine operating data under appropriate conditions to identify irregularities and assess performance.
Mechanical condition checks: A targeted visual inspection of accessible engine components and relevant mechanical systems.
Compression and borescope assessment: Available where technically appropriate and practical within the agreed assessment scope. Additional work may be required depending on vehicle access and complexity.
Written findings report: A summary of observations, identified concerns and recommendations for any further investigation, maintenance or corrective work.
The assessment is tailored to the vehicle, its specification and any reported symptoms. Not every test will be necessary or applicable to every vehicle.
Advanced Vehicle Diagnostics & Fault Investigation
Initial diagnostic assessment from £100 + VAT
Some vehicle faults can be particularly challenging to identify, especially when symptoms are intermittent, previous repairs have been unsuccessful or no diagnostic trouble codes are present.
At STealthwerx, we specialise in investigating complex engine management and performance-related issues through systematic testing and detailed analysis.
Our diagnostic capabilities include:
Engine misfires, hesitation and poor drivability
Fuel trim irregularities and air-fuel ratio concerns
Boost pressure and turbocharger control issues
Airflow, intake pressure and sensor correlation faults
Ignition, fuelling and engine management irregularities
Performance inconsistencies and unexplained power loss
ECU calibration and software-related operating concerns
Investigation of faults on standard and modified vehicles
Rather than replacing components based on assumptions, our objective is to establish the most likely cause through supporting diagnostic evidence.
Where a fault cannot be conclusively identified within the initial assessment, we will explain our findings and provide recommendations for further investigation.
Additional diagnostic time, dismantling, specialist testing or repair work will always be discussed and separately authorised before proceeding.
Pre-Tuning Vehicle Assessments
Before undertaking ECU calibration or performance upgrades, it is important to establish that a vehicle is operating correctly.
An existing mechanical or electronic fault can become more apparent when engine performance is increased.
Our pre-tuning assessments are designed to identify potential concerns before calibration work begins, helping to ensure that the vehicle is an appropriate candidate for the proposed modifications.
Where necessary, we may recommend maintenance, repairs or further investigation before proceeding.
Our priority is reliable, repeatable performance built upon a mechanically sound vehicle.
Why Choose STealthwerx Performance?
Experience beyond conventional diagnostics
Our background in ECU calibration, engine management systems and performance development provides an understanding of how engine operating parameters interact under real-world conditions.
We regularly work with standard and modified vehicles where interpreting live data, understanding control strategies and recognising abnormal operating behaviour are essential to effective diagnosis.
Our approach focuses on:
Evidence-led investigation rather than unnecessary component replacement.
Real-world operating data rather than relying solely on stored fault codes.
Specialist technical knowledge developed through hands-on diagnostics and calibration.
Clear communication explaining findings and recommended next steps.
Independent assessments with no obligation to proceed with additional work.
We aim to provide customers with a better understanding of their vehicle's condition and the information needed to make informed decisions about repairs, maintenance and performance upgrades.
Pricing & Appointments
Performance Health Check — From £100 + VAT
Advanced Diagnostic Assessment — From £100 + VAT
Initial appointments are subject to an agreed time allowance and assessment scope. The exact price will be confirmed before booking.
Further investigation, additional testing, dismantling or repair work is not included unless specifically agreed.
A health check is an assessment of the vehicle's condition at the time of inspection and does not constitute a guarantee against future mechanical or electronic failures.
Book Your Assessment
If your vehicle is experiencing an unexplained issue, you are considering performance modifications, or you simply want a better understanding of its mechanical and electronic condition, contact STealthwerx Performance to discuss your requirements.
STealthwerx Performance — Specialist Diagnostics, ECU Calibration & Performance Services
Norwich, Norfolk
Contact us via WhatsApp to discuss your vehicle or arrange an appointment.