Engine Diagnostics, Repair & Rebuilding
31 specialized services. ASE-certified technicians. Diagnostic-first approach.
Engine Replacement — Remanufactured
Expert remanufactured engine installation. We only source from three ISO 9001 certified partners offering true no-fault warranties. Avoid bad warranties that require engine shipping at your expense and long delays. By appointment only. 3 Year Unlimited Mileage No Fault Warranty. Send us your VIN #.
Engine Replacement — Salvage or Used
Expert used and salvage engine replacement and installation when remanufactured options are unavailable. We source from high-volume, reputable yards to ensure replacement stock for any future warranty claims. By appointment only for dedicated expert attention. Call now to schedule.
Transverse Engine Replacement
Expert transverse engine and transmission replacement. We specialize in complex cradle-drop and top-removal sourcing and installations for all makes. By appointment only to ensure our team is 100% dedicated to your vehicle upon arrival. Call now to schedule.
Engine Rebuilding — Stock Specifications
Expert engine rebuilds powered by Gene's Engine Service. Gene restores engines to like-new specifications with precision and care. By appointment only to ensure our specialists provide your rebuild our undivided expert attention. Call now to schedule your service.
Engine Rebuilding — Custom Performance
Expert performance rebuilding powered by Gene's Engine Service. We offer porting, 3/5-angle valve jobs, balancing, and boring for high-horsepower builds using reman short/long blocks or head rebuilds. By appointment only for undivided expert attention. Call now to schedule.
Performance Camshaft Installation
Unlock more power and torque with a performance camshaft installation. We provide expert swaps and tuning to optimize your engine's breathing and high-RPM performance. By appointment only to ensure our specialists provide your build undivided expert attention. Call.
GM AFM/DOD Service — Path 1 (OEM Compliant)
Restore your GM engine using Genuine OE parts and ACDelco factory programming. We fix failed lifters and camshafts to latest factory specs, protecting your existing powertrain warranty. By appointment only. LS/LT 5.3L, 6.0L, 6.2L.
GM AFM/DOD Service — Path 2 (Performance Delete)
A permanent fix for out-of-warranty GM engines. We perform full mechanical AFM/DOD deletes using high-quality BTR, TSP and Summit Racing performance components. Note: This path prioritizes performance over factory warranty. By appointment only. Tuning by Black Bear Performance. Call to book.
Head Gasket Replacement
Fix overheating and coolant leaks with a professional head gasket replacement. We ensure cylinder heads are flat and sealed perfectly to restore engine compression and cooling. By appointment only to provide your major engine repair our full expert attention. Call to schedule.
Timing Chain Replacement
Resolve timing rattles and stretch issues with expert timing chain replacement. We use high-quality kits to restore precise valve timing and engine longevity. By appointment only to provide your complex engine repair our undivided expert attention. Call now to book today.
Timing Belt Replacement
Prevent catastrophic engine failure with timely timing belt replacement. We replace belts, tensioners, and pulleys to manufacturer specs to keep your engine's internal components perfectly synced. By appointment only to ensure our team is ready for your vehicle upon arrival.
Engine Mount Replacement
Eliminate excessive engine vibration and drivetrain clunks with new engine mounts. We replace worn or broken mounts to restore smoothness and protect your transmission and exhaust from stress. By appointment only for dedicated expert attention. Call now to schedule.
Rear Main Seal Replacement
Expert rear main seal replacement to resolve serious oil leaks between your engine and transmission. We provide precision installation to protect your driveway and engine health. By appointment only for dedicated expert attention to your vehicle. Call now to schedule your service.
Intake Manifold Replacement & Reseal
Vacuum leaks from bad seals trigger lean codes P0171/P0174 & idle codes P0506/P0507. We clean mating surfaces, install quality gaskets, verify codes clear. Expert repair. Call Dave Jr.
Exhaust Manifold Replacement
Cracked manifolds cause exhaust leaks, triggering O2 sensor codes P0131/P0151 & lean codes P0171/P0174. Expert replacement restores oxygen sensor accuracy. By appointment. Call Dave Jr.
Exhaust Stud Extraction
Broken exhaust studs cause exhaust air leaks ahead of oxygen sensors, leading to faulty readings and lean codes. Your personal mechanic, David Jr., provides expert stud extraction and manifold repair to restore sensor accuracy for guaranteed emissions compliance. By appointment for dedicated care.
Cylinder Misfire Diagnosis & Repair
Cylinder misfires cause rough idling and power loss, triggering P0300-P0308 codes. Your personal mechanic, David Jr., provides expert diagnostics to identify single or multiple cylinder failures. He ensures precision repairs for guaranteed emissions compliance. By appointment for dedicated care.
Engine Block Pressure Testing
Expert engine block pressure testing to detect combustion leaks and head gasket failures. We pinpoint internal engine issues with precision to prevent overheating and costly damage. By appointment only to provide your vehicle undivided expert attention. Call now to schedule.
Engine Oil Analysis
Oil testing is laboratory analysis of used engine oil to assess vehicle health, detecting metal particles, contaminants (fuel, coolant, dirt), to prevent failures and optimize oil change intervals. It acts like a blood test for the engine, identifying issues like worn bearings and gasket leaks.
Knock Sensor Replacement
Keep your engine safe from internally damaging vibrations with professional knock sensor and knock sensor harness replacement at Apex Automotive. Our experts diagnose and replace faulty sensors to eliminate P0324, P0325, P0327, P0328 and P0329 malfunction or circuit codes.
Camshaft Position Sensor Replacement
This replacement service addresses codes such as P0340 (Camshaft Position Sensor Circuit Malfunction) and P0341 (Camshaft Position Sensor Circuit Range/Performance).
Crankshaft Position Sensor Replacement
This sensor is addressed as part of the diagnostic and repair process, where specialized tools are used to resolve sensor issues so the vehicle achieves emissions compliance. Related codes include P0335 (Crankshaft Position Sensor A Circuit Malfunction) and P0336 (Crankshaft Position Sensor A Circuit Range/Performance).
Fuel Pump Replacement
Fuel pump codes P0230-P0232 hide wiring faults. Rail pressure codes P0087-P0088 signal pump vs. circuit failure. We diagnose before replacing. Expert fuel specialist. Call.
Ignition System Repair
Misfire codes P0300-P0308 & ignition codes P0350-P0358 indicate coil/plug/wiring failure. We diagnose which component actually failed before expensive replacement. Call Dave Sr. or Dave Jr.
Spark Plug Replacement
Stay on top of vehicle performance with professional spark plug replacement at Apex Automotive. Our ASE-certified team uses premium Iridium or Platinum plugs to restore fuel economy and power. Call to schedule an appointment with Dave Sr. or Dave Jr. today.
PCV Service & Replacement
Expert PCV system service to resolve oil leaks and rough idling. We test, clean, or replace valves, including those integrated into valve covers. We clear codes like P0171, P0174, and P0507. By appointment only for dedicated expert attention. Call now to schedule.
Intake Valve Cleaning Service (Walnut Blast)
Expert intake valve carbon cleaning for direct injection engines. We resolve heavy buildup common in VW, Audi, BMW, and GM GDI systems. Carbon buildup triggers lean codes P0171/P0174 & timing code P0011. Direct injection cleaning restores airflow. GDI engines. By appointment. Call Dave Jr.
Turbocharger Diagnostics & Replacement
Expert turbocharger diagnostics and replacement to restore engine power and efficiency. We pinpoint oil leaks, bearing failures, and boost issues with precision. Turbo codes P0234 (overboost) & P0299 (underboost) signal boost sensor or compressor failure. Expert diagnostics by appointment. Call.
EFI Conversions
Expert EFI conversions for Ford, GM, and Mopar. We install high-pressure pumps, injectors, rails, and custom tank mods with precision tuning. Modernize your classic with top-end manifolds and sensors. By appointment only for dedicated expert attention. Call now to schedule.
Muffler & Exhaust Repair
An exhaust leak requires a precise diagnosis. Your personal mechanic, David Jr., will thoroughly inspect the entire system to pinpoint the exact failure point. He then consults with you on the findings, recommending a targeted, effective repair strategy, not just a patch. By appointment.
Oil Pan Gasket Replacement
An oil drip on your driveway deserves more than a quick sealant job. Your personal mechanic, David Jr., puts the vehicle on the lift and inspects every possible leak point — oil pan gasket, rear main seal, valve covers, timing cover, and oil cooler lines — to confirm the actual source before quoting a repair. He then consults with you on the findings and replaces the gasket with OE-spec materials, properly torqued to factory specifications. By appointment.