Diesel diagnostics & repair

Diesel Engine Repair in Johnson City, TN

Hard starting, smoking, or losing power?

Diesel engines run differently than gas engines, and they deserve technicians who know the difference. Our ASE certified team diagnoses and repairs diesel trucks, vans, and SUVs of all makes.

Call (423) 913-3111 Schedule Service

Diesel Trouble Doesn't Wait

A diesel engine that's hard to start, smoking more than usual, or losing power is telling you something. Diesel fuel systems run at much higher pressure than gasoline engines, and problems in the injectors, glow plugs, or fuel system can get expensive fast if they're ignored. Our ASE certified technicians have the training and diagnostic equipment to find the real cause and fix it right.

Common diesel complaints

Signs Your Diesel Needs Attention

Hard Starting

Slow cranking or trouble starting, especially in cold weather, often points to glow plugs, the battery, or a fuel delivery issue.

Excess Smoke

Black, white, or blue smoke each point to different problems, from a rich fuel mixture to oil burning in the combustion chamber.

Loss of Power

A diesel that feels sluggish or can't maintain power under load may have a clogged fuel filter, injector issues, or a failing turbo.

Rough Idle or Knocking

Unusual noises at idle or under load are worth having diagnosed before they turn into a bigger repair.

What We Service on Diesel Engines

Full diesel diagnostic scanning to pinpoint the real issue
Fuel system service and repair, including injectors and fuel filters
Diesel oil changes with manufacturer-approved oil and filters. See our oil change service
Glow plug and cold-start system repair
Turbocharger inspection and repair
General maintenance to keep a diesel running reliably for the long haul

We've also worked directly with extended service contracts like MaxCare to help customers get their diesel repairs covered and their claims filed without the runaround. We service diesel trucks, vans, and SUVs, including Ford Power Stroke, Ram Cummins, Chevy Duramax, and Mercedes-Benz Sprinter and diesel car engines. We diagnose before we quote, and we never sell a repair you don't need. Every qualified diesel repair we perform is backed by our 36 month, 36,000 mile nationwide warranty on parts and labor.

How Much Does Diesel Engine Repair Cost?

It depends entirely on what's actually wrong. A glow plug or a fuel filter is a small repair. Injector work, turbocharger repair, or a fuel system overhaul costs more. We run a full diagnostic first and give you a real, itemized price for your specific engine, not a phone guess.

Customer reviews

What Our Customers Say

"American & Import Auto Repair on Hopper Road have been there for me twice in the last month and both times have done an excellent job diagnosing and repairing my diesel. They worked with my MaxCare service contract with great success filing my claims."

Joe M.

"All I can say is you earned your 5 stars. Everything they said they would fix, they fixed, and they did it with skill. Very happy to have found American and Import Auto Repair."

Vickie B.

"This place is always busy for a reason. Top of the line mechanics, and super friendly office people. They are honest, which is so very important when it comes to your vehicle."

Kimberly S.

"First time service. Staff was friendly, supportive, kept me up to date on progress, and I didn't feel like a number. Waiting room was pleasant with nice amenities. I will be back."

Dee O.

Read more reviews on Google: Market Street (700+) · Hopper Road (90+)

Two shops in Johnson City

Bring Your Diesel to Either Location

Location One

West Market Street

3832 W Market Street
Johnson City, TN 37604

(423) 913-3111

Call Shop Directions

Location Two

Hopper Road

216 Hopper Road
Johnson City, TN 37604

(423) 328-7036

Call Shop Directions

Common questions

Diesel Engine Repair FAQ

Do you work on diesel trucks?

Yes. We diagnose and repair diesel engines in trucks, vans, and SUVs, including fuel system work, oil changes, and general maintenance.

What are common signs of diesel engine trouble?

Hard starting, excessive smoke, a loss of power, rough idling, unusual knocking, or a check engine light. Diesel systems run at higher pressures than gas engines, so problems are worth catching early.

How often should a diesel get an oil change?

It depends on the vehicle, how it's driven, and the oil used, but diesel oil changes are generally needed more often under heavy use or towing. We can recommend the right interval for your truck.

Do you work with extended warranty or service contracts?

Yes. We've worked with service contracts like MaxCare and can help file your claim as part of the repair.

How much does diesel engine repair cost?

It depends entirely on what's actually wrong. A glow plug or fuel filter is a small repair. Injector work, turbocharger repair, or a fuel system overhaul costs more. We diagnose first and give you a real, itemized price.

Is diesel repair work covered by a warranty?

Yes. Qualified diesel repairs are backed by our 36 month, 36,000 mile nationwide warranty on parts and labor.

Serving Johnson City and the Tri-Cities

We service diesel engines for drivers across Johnson City, Jonesborough, Gray, Telford, Chuckey, Elizabethton, Erwin, Fall Branch, Kingsport, Limestone, Piney Flats, and throughout Washington, Carter, and Unicoi counties. See our full list of services, learn what sets our shop apart, or head back to our home page.

Keep your diesel running strong

Let's get your diesel sorted out

Hard starting, smoke, or a loss of power, our ASE certified team will find the cause and fix it right.

Schedule Service Call W Market St Call Hopper Rd

W Market St · (423) 913-3111 Hopper Rd · (423) 328-7036