Light Duty Diesel Repair in Cheyenne, Wyoming
Honesty & Quality
Diesel pickups are what TDC Automotive & Light Duty Diesel is built around — it's in the name. From routine fuel filters and oil changes to injectors, turbos, head gaskets and complete engine replacement, Trevor works on the diesel platforms that do the actual work around here: Cummins-powered Rams, Powerstroke Fords, and Duramax GM trucks.
Diesel work is billed at an honest $135/hr, and every job starts with a real diagnosis — compression tests, fuel system testing, and turbo checks — so you're paying to fix the confirmed problem, not to guess at it. If your truck earns its keep hauling, plowing, or working a ranch, you need it diagnosed right the first time.
Diesel Repair Services
Cylinder Compression Testing
Compression is the foundation of how a diesel runs — these engines rely on cylinder pressure to ignite fuel, so low compression shows up as hard starting, white smoke, rough idle, blow-by, and lost power.
Learn more →Turbo Diagnostics & Repair
Turbo problems show up as low power, black smoke, excessive whistle or whine, surging, or oil consumption — but so do boost leaks, sticking VGT vanes, and exhaust restrictions that have nothing to do with the turbocharger itself.
Learn more →Fuel System Diagnostics
Modern common-rail diesel fuel systems run at extreme pressures with tight tolerances, and when something's wrong — hard starts, long cranks, low power, derates, or fuel dilution in the oil — the parts involved are expensive enough that guessing is not an option.
Learn more →Overheating Diagnostics
A diesel that runs hot under load — towing, climbing a grade, or bucking a Wyoming headwind — has a real problem that will only get more expensive.
Learn more →Air Filter Replacement
A turbo diesel moves a huge volume of air, and on the gravel and dirt roads around Laramie County that air is full of dust.
Learn more →DCR Injection Pump Conversion
The CP4 injection pump fitted to many late-model diesels has a well-earned reputation: when it fails, it can send metal debris through the entire fuel system — injectors, rails, lines — turning one failed pump into a repair bill north of $10,000.
Learn more →CP3 Injection Pump Conversion
The CP3 injection pump earned its reputation on the 2003–2018 Cummins: a simple, durable design that routinely outlives the truck around it.
Learn more →Disaster Prevention Kits
A disaster prevention kit is the budget-smart middle ground for CP4-equipped diesels: instead of replacing the pump, it re-routes the pump's lubrication/return path so that if the CP4 ever starts shedding metal, the debris is contained and filtered instead of being pumped through your injectors, rails and lines.
Learn more →Diesel Injector Service
Failing injectors show up as white or black smoke, rough idle, fuel knock, hazy cold starts, fuel in the oil, or a dead miss on one cylinder.
Learn more →Head Gasket Replacement
Head gasket failure on a diesel usually announces itself as unexplained coolant loss, overheating under load, or pressure building in the coolant overflow.
Learn more →Diesel Engine Replacement
Sometimes the honest answer is that the engine is done — spun bearings, a dropped valve, a cracked block, or wear that makes a rebuild cost more than it's worth.
Learn more →Piston Replacement
A melted or cracked piston — usually the result of an injector washing a cylinder, extreme heat from hard tuning, or a foreign object — takes one cylinder down and puts metal where it shouldn't be.
Learn more →Camshaft Replacement
Camshaft problems — worn lobes, flattened lifters, or a broken cam — show up as ticking, misfires, low power and metal in the oil.
Learn more →Diesel Diagnosis Done Right
- Verify and inspect
Every diesel complaint starts with reproducing the symptom and a physical inspection — leaks, soot trails, boots, clamps and wiring.
- Test the systems
Compression tests, fuel system diagnostics and turbo checks isolate whether the problem is mechanical, fuel, or air.
- Confirm before replacing
Injectors, pumps and turbos are expensive. Nothing gets replaced until testing confirms it failed.
- Fix it for the long haul
Where a known weak point exists — like CP4 injection pumps or grid heater bolts — Trevor will tell you about the proven prevention options.
Frequently Asked Questions
What does diesel engine repair cost at TDC?
Labor is billed at an honest hourly rate: $125/hr for gas vehicles and $135/hr for diesel. You get the diagnosis and an estimate before any repair work starts — call (307) 996-0980 and Trevor will give you a straight answer about your vehicle.
Do you handle all diesel repair work in-house?
Yes — everything listed on this page is done in the shop by Trevor at 8407 Aztec Drive in Cheyenne. One mechanic, one standard of work, no hand-offs.
How do I get started?
Call (307) 996-0980 and describe the symptom or the work you want done. You'll talk directly to the mechanic — not a service writer — and get a straight answer about diagnosis, scheduling and cost.