Engine Diagnostic

Find the Root Cause with Accurate Engine Diagnostics

If your truck, mower, or small engine is sputtering, refusing to start, or displaying warning signs, don’t guess — get an expert engine diagnostic from National Restorations, LLC in Queenstown, MD. We identify the actual cause of engine problems using precise diagnostic procedures.



We service everything from light-duty pickup trucks to handheld lawn tools. Whether your equipment is gas-powered or diesel, our diagnostics go beyond generic error codes to give you real insight. We believe in fixing what’s necessary — no guesswork, no waste.

What Our Engine Diagnostic Service Includes

Our diagnostic process is designed to eliminate uncertainty. Depending on the engine type, we include:



  • Computerized fault code scanning (if applicable)
  • Engine compression testing
  • Spark plug analysis and coil testing
  • Carburetor function testing (small engines)
  • Fuel pump and line inspection
  • Battery and alternator performance check
  • Ignition system and electrical troubleshooting
  • Sensor testing (MAF, TPS, O2, coolant)
  • Fuel pressure regulation
  • Air intake and exhaust flow evaluation
  • Choke and throttle response
  • Vacuum line and gasket leak check


By analyzing both mechanical and electronic components, we find the actual cause — not just the symptom.

When Do You Need an Engine Diagnostic?

You should schedule a diagnostic if your vehicle or equipment shows any of these signs:



  • Check engine light or other warning lights
  • Rough idling or unusual engine noises
  • Loss of power or acceleration
  • Hard starting or frequent stalling
  • Fuel efficiency drop
  • Strong gas or exhaust odor
  • Excessive smoke from exhaust
  • Frequent shutdowns or surges
  • Unexplained vibrations
  • Failed emissions test


Catching these issues early with proper diagnostics can save you hundreds in repair costs and extend the life of your engine.

Engine Diagnostics for Small Engines

In addition to trucks, we perform diagnostics on a wide range of small engines, including:



  • Lawn mowers
  • Weedwackers
  • Leaf blowers
  • Chainsaws
  • Log splitters
  • Snow blowers
  • Portable generators


For small engines, we run full mechanical inspections and tune-related testing — especially for hard-to-start equipment or those with intermittent power loss. We know the telltale signs of carburetor blockage, spark failure, and poor compression — and how to fix them quickly.

What Happens After the Diagnostic?

Once your diagnostic is complete, we will:



  • Explain the results clearly
  • Provide a written repair estimate
  • Let you know which issues are urgent vs. minor
  • Give honest recommendations
  • Advise if a machine isn’t worth repairing


We won’t move forward with repairs unless you approve them — and we never pressure you into unnecessary work.

Why Choose National Restorations for Engine Diagnostics?

We’ve built a reputation in Queenstown for accurate diagnostics, clear answers, and ethical service. Our customers trust us because:


  • We’re experienced with both small engines and trucks
  • We offer fair pricing and fast turnaround
  • We use proper diagnostic tools, not guesswork
  • We treat every customer with honesty and respect
  • We serve both homeowners and professionals

Diagnostics for Pickup Trucks and Light-Duty Vehicles

We offer full engine diagnostics for pickup trucks and other gas-powered vehicles. Using advanced scan tools and hands-on evaluation, we check:



  • Engine codes and sensor faults
  • Fuel injector performance
  • Cylinder compression and valve timing
  • Spark plug and coil function
  • Battery health and electrical integrity
  • Throttle body and idle air control operation


These diagnostics help us determine whether a minor fix or major service is needed — and we explain every result in simple, honest language.

Book Your Diagnostic Service Today

If your engine’s acting up, don’t delay. Let National Restorations, LLC diagnose the problem the right way — and help you get back to work fast.