Engine Diagnostics & Repair
Computer-controlled diagnostics, injector testing, compression checks, and complete engine overhauls using dealer-level scan tools and proper procedures.
West Haven, Connecticut
Your diesel engine deserves a specialist — not a generalist
We diagnose, repair, and maintain heavy-duty diesel powertrains the way they were meant to be: with focused expertise, proper equipment, and honest timelines.
Locally owned
Cummins · Duramax · Power Stroke
Diagnostic equipment
What We Do
Specialized diesel service, not a general shop with a diesel bay
DPF & Emissions Systems
Active and passive DPF cleaning, regeneration procedures, EGR servicing, and DEF system troubleshooting — keeping your truck road-legal and efficient.
Fuel System Service
High-pressure fuel pump diagnosis, injector replacement and programming, fuel system cleaning, and lift pump maintenance for Cummins, Duramax, and Power Stroke.
Transmission & Drivetrain
Automatic and manual transmission repair, clutch replacement, transfer case service, and differential work built to handle diesel torque.
Performance Tuning
Professional engine calibration, flash tuning, and bolt-on support from reputable tuners — torque, MPG, towing capacity, or daily driveability.
Pre-Purchase Inspections
Thorough diesel-specific inspection before you buy — compression testing, smoke analysis, scan tool readout, and a written report so you know what you're getting.
About Us
Built around diesel. Not beside it.
Clean Diesel Specialist of CT was founded on a simple premise: diesel trucks and commercial vehicles need a different approach than gasoline engines. The fuel systems are higher pressure, the electronics are more complex, and the consequences of a wrong part or improper procedure are far more costly.
We built our shop from the ground up for diesel — proper diagnostic tools, genuine parts sourcing, and the kind of institutional knowledge that comes from working on these engines every day. Whether it's a daily driver Duramax or a work truck that runs 200,000 miles a year, we treat it with the same standard.
CT
Locally owned and operated
3
Major diesel brands serviced
100%
Diagnostic-focused approach
Why Choose Us
The difference is in the details
Honest timelines
We don't guess. We diagnose first, then tell you exactly what's needed and how long it will take — no surprises at pickup.
Proper parts, not shortcuts
OEM and quality aftermarket parts only. We source correctly the first time instead of cutting corners that cost more later.
All three major brands
Cummins, Duramax, and Power Stroke — we don't specialize in one and send the others away. Your truck gets the full treatment.
Clear communication
We explain what we find, why it matters, and what your options are — in plain language, not technician jargon.
Contact
Get in touch
Have a question or need to schedule service? Reach out by phone, email, or stop by the shop — we're here to help.
