Diesel And Traditional Engine Repair Services in Nampa, ID

When something feels off with your truck or car, you want answers fast -- not a week on a waiting list.

At Ray's Diesel & Automotive Repair in Nampa, we don't require appointments for diagnostic checks.

Bring your vehicle in, and our ASE-certified technicians will run a complete digital diagnostic scan on the spot. You'll know what's wrong before you leave the parking lot, and we'll walk you through exactly what it'll take to fix it.

We work on all makes and models, but diesel is where we live. Whether you're driving a Cummins, Duramax, or Powerstroke, our team has the hands-on experience to handle everything from routine repairs to complex engine work that other shops in the Treasure Valley won't touch.

What We Repair

Our engine repair services cover the full mechanical picture. We diagnose and repair:

Drivetrain -- axles, driveshafts, CV joints, and transfer cases that take a beating on Idaho roads and job sites

Transmission -- automatic and manual transmission service, fluid checks, solenoid replacement, and full rebuilds when needed

Differentials -- front and rear differential repair, fluid service, and bearing replacement

Steering Systems -- power steering pumps, rack and pinion, tie rods, and alignment-related mechanical issues

Electrical Components -- wiring, sensors, alternators, starters, and charging system diagnostics

Computer Systems -- ECM/PCM diagnostics, software-related fault codes, and module repairs

No matter which system is causing the problem, our diagnostic process starts with data, not guesswork.

We Do Diesel Particulate Filter (DPF) Cleaning And Replacement

Here's something most shops in Nampa can't say: we clean and replace diesel particulate filters in-house. If you drive a newer diesel truck, your DPF is doing a critical job -- trapping soot and particulate matter from your exhaust to keep your emissions system compliant. Over time it clogs, and a clogged DPF means reduced power, rough idle, increased fuel consumption, and eventually a check engine light that won't quit.

Forced regeneration, manual cleaning, and full filter replacement are all services we perform regularly. We'll tell you honestly whether your filter can be cleaned or whether it needs to go, and we'll back the repair with the same NAPA warranty that covers everything else we do here.

If you've been told by another shop that DPF service isn't available locally, give us a call.

How It Works

Bringing your vehicle to Ray's Diesel is straightforward. No appointment is needed for a diagnostic scan. Pull in, let us know what you've been experiencing, and we'll get the scan going. If you'd rather start with an estimate before you come in, we can work with your VIN or license plate number over the phone.

Once we've diagnosed the issue, we'll give you a clear breakdown of what's needed, what it'll cost, and how long it'll take. And if your repair qualifies, you can take advantage of our 12-month, no-interest financing through Synchrony -- helpful when you're dealing with a bigger job.

All engine repairs are backed by a three-year, 36,000-mile NAPA warranty. AAA members receive 10% off.

Serving Nampa and the Treasure Valley

We're located at 2002 West Karcher Rd in Nampa, and we regularly serve customers from Caldwell, Meridian, Boise, Kuna, and throughout Canyon and Ada counties. If your vehicle needs to be brought in, our Towing Service is available 24/7.

For performance upgrades alongside your engine repair, ask us about our Turbo Rebuilds and Stage 2 or Stage 3 upgrade options. And for keeping everything running between major repairs, our Regular Maintenance team handles oil changes, brake checks, AC service, and more.

Stop by anytime or call us at (208) 391-6067 to get started.