When lower fan speeds die and only high works, the blower resistor has failed. Here’s why high still works, how to check the melted connector everyone misses, and the amp-draw test that stops the resistor from failing again.
Silverado Blower Motor Only Works on High: Resistor Diagnosis and Fix Read Post »
If your 2003–2006 GM truck’s speedometer is pegged at 120 or the fuel gauge is lying, the cluster’s stepper motors have failed. Here’s how to confirm it and the three ways to fix it, from a $30 solder job to a full cluster.
Silverado Gauges Not Working? GMT800 Cluster Stepper Motor Fix (2003–2006) Read Post »
Chevy 5.3 burning oil? AFM-equipped 5.3s are the known oil consumers. Here are the real causes ranked, how to confirm them, and the fixes that actually work.
5.3 Oil Consumption: Why Your Chevy 5.3 Burns Oil and How to Fix It Read Post »
Chevy/GMC 4WD not engaging with a Service 4WD light? The two usual culprits are the transfer case encoder motor and the TCCM. Diagnose it in the right order before you throw parts.
Chevy 4WD Not Engaging: Service 4WD Light, Encoder Motor and TCCM Diagnosis Read Post »
There is no single universal 8.1L L18 drive-by-wire pinout. This reference separates the 2001–2002 pre-MCE light-duty system from the 2003–2006 MCE system — P01 vs. P59 PCMs, split vs. integrated throttle hardware, the year-specific cam/crank cavity difference, and what actually has to match before you build a standalone L18 harness.
GM 8.1L Vortec L18 Drive-by-Wire Wiring: 2001–2002 vs. 2003–2006 Light-Duty Pinouts Read Post »
OBS door rod clip part numbers explained, including GM 15053341. What door handle rod clips are, why they break, and how to verify fitment before you buy.
OBS Door Rod Clip Part Numbers: OEM Door Handle Rod Clips for Chevy & GMC Trucks Read Post »
A practical, owner-level rebuild guide for the 1999–2006 GMT800 tailgate — how to diagnose and fix the latches, cables, hinge, and handle before the gate sags, sticks, or drops.
GMT800 Tailgate Rebuild Guide: Latch, Cable, Hinge & Handle (1999–2006 Silverado/Sierra) Read Post »
Running ACDelco 41-983 plugs gapped at .045″ on the 8.1L Vortec — a noticeable improvement over .060″. Broke my wires mid-job on a Friday afternoon and discovered LS wires fit in a pinch. Here’s the full breakdown including wire brands, the PCV plug-eating issue, and what to do when you’re stuck.
My 2002 Avalanche 2500 8.1L Vortec had startup valvetrain chatter every cold start on 5W-30 synthetic. Switched to Shell Rotella T4 15W-40 — noise gone. Here’s what happened, why it worked, and what to check before you change anything.
8.1L Vortec Startup Chatter Fixed: Why I Switched from 5W-30 to Rotella T4 15W-40 Read Post »
Low oil pressure at hot idle on a 4.8, 5.3 or 6.0 GMT800? Confirm it with a mechanical gauge before spending money — a full diagnosis covering the sender, sensor screen, pickup tube O-ring, oil pump and when to stop driving.
GMT800 Hot-Idle Low Oil Pressure: 5.3L and 6.0L Diagnosis and Pickup Tube O-Ring Guide Read Post »
