Diesel Injector Testing and Replacement
Diesel Engine Repair — Cheyenne, WY
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. But injector sets are one of the priciest jobs on a diesel — so Trevor tests before replacing: balance rates, return flow, and contribution testing identify which injectors are actually failing and why.
The 'why' matters. Injectors rarely die of old age alone; contaminated fuel, a failing pump, or a neglected filter kills them. TDC replaces injectors with quality parts and addresses the root cause so the new set doesn't follow the old one into the scrap bin.
What's Included
- Injector balance and return-flow testing
- Smoke, haze, knock and rough idle diagnosis
- Quality replacement injectors — stock or performance
- Root-cause inspection of the fuel supply
- Cummins, Powerstroke and Duramax experience
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.
Related Diesel Repair Services
Frequently Asked Questions
How much does diesel injector service cost at TDC Automotive?
Labor is billed hourly at $135/hr, and you'll get findings and an estimate before repair work begins. Call (307) 996-0980 with your year, make and model and Trevor can give you a realistic idea of what's involved.
Do I need an appointment for diesel injector service?
Call ahead at (307) 996-0980 — as an owner-operated shop, TDC schedules work so your vehicle gets Trevor's full attention rather than sitting in a lot for a week.
Where is the shop, and what area do you serve?
The shop is at 8407 Aztec Drive in Cheyenne, Wyoming, and serves all of southeast Wyoming plus the Nebraska panhandle and Northern Colorado — customers regularly drive in from Laramie, Wheatland, Torrington, Pine Bluffs, Wellington, Fort Collins and Greeley.