Porsche Cayenne Misfire Counts: When the Engine Wasn’t Misfiring
An NVH-led Cayenne Hybrid diagnosis where a failed clutch-plate damper created crankshaft speed variation that the ECU counted as combustion misfire.
Neo
VW Polo P0106 and P0172: The Timing-Chain Fault the Scan Tool Didn’t Name
A three-cylinder Polo case where MAP contamination was real but dynamic cam/crank phase movement proved the remaining timing-chain fault.
Toyota Celica P0172: How One MAF Read Rich at Idle and Lean Under Load
A 2ZZ Celica fuel-trim case where the same contaminated MAF overreported idle air yet responded too slowly and too little at wide-open throttle.
MK7 GTI Water Pump Leak: Plan the Intake-Off Repair and Cooling-System Refill
A 2015 GTI water-pump and thermostat-housing workflow covering access, the reverse-thread drive bolt, low-torque assembly and actuator adaptation.
Volvo C30 PCV Failure: Replace the Oil Filter Housing Without Losing the Reassembly Map
A Volvo P1 PCV and oil-filter-housing replacement organized around access, hose routing, ECM protection, oil-pressure confirmation and leak checks.
VW TSI Cold-Start Misfires: When Carbon Cleaning Must Be Measured, Not Hoped For
A controlled intake-carbon comparison showing why one clean reference port is more useful than an unverified chemical-treatment promise.
How to Use the AUTOOL LM70 Digital Manifold Gauge
A detailed AUTOOL LM70 guide to refrigerant selection, atmospheric zeroing, safe hose setup, dual-side pressure and pipe-temperature readings, timed tests, evacuation limits, and shutdown.
Subaru Legacy P0304 After an Engine Swap: Prove the Leak Before Swapping Parts
A cylinder-four misfire diagnosis that moves from ineffective ignition and fuel swaps to leak-down evidence and a subtly bent exhaust valve.
Land Rover Discovery No-Crank: Proving an Offline TCU Before Programming
A three-stage intermittent no-crank case that separates two convincing false fixes from an offline telematics module with good power, ground and CAN.
Mercedes GL500 Battery Drain: Find the 0.8-A Load Without Pulling Fuses
A sleep-current diagnosis that uses fuse voltage drop and thermal confirmation to locate a rear blower controller draining the battery overnight.