Engine Repairs

Engine Repair & Diagnostics — Keep Your Vehicle Running Strong

Your engine is the heart of your vehicle. When something goes wrong — whether it’s a misfire, rough idle, overheating, or a strange noise — it needs proper diagnosis and repair. At Johnny’s Auto Repair & Services, we provide reliable and honest mobile engine diagnostics and repairs for both American and European vehicles, giving you dealership-level service right at your location.

What Engine Repairs We Handle

We diagnose and repair most common engine issues, including:

Misfires & Rough Idle

Issues with spark, fuel, or air can cause your engine to run unevenly.

We repair:

• Spark plugs

• Ignition coils

• Plug wires (if equipped)

• Fuel injectors

• Vacuum leaks

• Air intake issues

• Mass airflow (MAF) & MAP sensor problems

Check Engine Light / Engine Warning Lights

We use professional diagnostic tools to find the exact cause — no guessing.

Common causes we fix:

• Sensor failures (O2, MAF, MAP, cam/crank)

• EVAP system leaks

• Catalytic converter efficiency issues

• Fuel trim problems

• Engine running rich/lean

• Idle control issues

Cooling System Problems

Overheating can cause major engine damage if not addressed.

We service:

• Thermostats

• Radiators

• Coolant leaks

• Water pumps (location permitting)

• Hoses & clamps

• Coolant temperature sensors

(A/C cooling is not included — only engine cooling.)

Fuel System Issues

Your engine needs the right amount of fuel at the right pressure.

We diagnose & repair:

• Fuel pumps (depending on location)

• Fuel filters

• Injectors

• Fuel pressure issues

• Fuel rail leaks

• Dirty throttle bodies

Air & Intake System Repairs

Airflow problems can cause misfires, stalling, and poor performance.

We fix:

• Intake leaks

• PCV system failures

• Air ducts & boots

• Throttle body issues

• Idle sensors

Belts, Pulleys & Noises

Strange noises often come from worn components.

We repair:

• Serpentine belts

• Idler pulleys

• Tensioners

• Alternator pulleys

• Power steering pulleys

Catching these early prevents breakdowns.

Gasket & Seal Repairs (Light to Moderate)

We handle:

• Valve cover gaskets

• Oil filter housing gaskets

• Oil pan gaskets (if accessible)

• Intake manifold gaskets

We help prevent leaks before they become major issues.

Engine Repairs We Do NOT Perform On-Site

To stay transparent with customers:

We DO NOT offer:

• Full engine replacements

• Timing chain/belt replacements on difficult-access engines

• Internal engine repairs (pistons, crankshaft, camshaft)

• Head gasket replacements that require engine teardown

• Major top-end or bottom-end rebuilds

Mobile engine repair has limits — but we can diagnose if these major repairs are needed.

American/Japanese vs. European Engine Systems

American/Japanese Vehicles

• Easier engine bay access

• More straightforward repairs

• Affordable parts

• Predictable diagnostic patterns

European Vehicles

• More sensors and electronic control

• Tighter engine layouts

• More complex cooling systems

• Require exact-spec oils, coils, and sensors

• Sensitive to poor-quality replacement parts

We are equipped to handle both correctly.

Our Engine Diagnostic Process

We follow a thorough and accurate diagnostic workflow:

1) Full-system scan

Read codes from engine, transmission, and related modules.

2) Live data analysis

Monitor fuel trims, air intake, temperature readings, and sensor behavior.

3) Component testing

Check spark, fuel pressure, vacuum leaks, and electrical integrity.

4) Mechanical inspection

Inspect hoses, belts, gaskets, coolant condition, and visible engine components.

5) Confirm root cause

We verify the exact failure — no guessing or unnecessary parts.

6) Explain clearly

You get:

• What’s wrong

• Why it failed

• How to fix it

• Exact pricing before any work is done

Common Engine Symptoms We Fix

• Check engine light on

• Misfires / shaking

• Loss of power

• Poor fuel economy

• Stalling or hard starts

• Overheating

• Knocking or rattling noises

• Oil leaks

• Smoke from exhaust

• Rough idle

• High engine temperature

• Strange smells (burning, fuel, coolant)

If your engine is acting up — we can diagnose and repair the issue quickly and professionally.

Mobile Engine Repair — Done At Your Home or Workplace

With Johnny’s Auto Repair & Services, you get:

• No towing required

• Quick and accurate diagnosis

• Honest pricing

• High-quality OEM-grade parts

• Repairs done at your location

• Clear communication and photos

• Warranty on most repairs

• Service for American/Japanese & European vehicles

Your engine is the most important part of your vehicle — we keep it healthy, reliable, and running right.