P0327 and P0332 on an LS Vortec are almost always corroded knock sensors buried in the valley under the intake. Here’s the right way to fix it once — sensors, connectors and sealing.
GMT800 Knock Sensor Codes P0327 & P0332: The Real Fix (5.3, 6.0 Vortec) Read Post »
On 1998–2007 GM 4x4s, the transfer case oil pump slowly wears a hole through the magnesium case — fluid leaks out and the case is scrap. A pump brace kit installed during a fluid change prevents it. Here’s how to check yours and fix it before it fails.
GM Transfer Case Pump Rub: The $100 Fix That Saves a $1,500 Case (1998–2007) Read Post »
A lying fuel gauge on a GMT800 has exactly two usual suspects: a sulfur-contaminated sending unit in the tank, or the cluster itself. Guessing wrong costs a fuel pump drop or a cluster repair for nothing. Here’s the check that decides it.
Silverado Fuel Gauge Wrong or Erratic: Sending Unit vs Cluster (1999–2006) Read Post »
That clicking behind your Silverado or Tahoe dash is a blend door actuator with stripped gears. Here’s how to identify which of the several actuators failed, replace it, and — the step everyone skips — run the relearn.
Chevy Blend Door Actuator: Clicking Dash Diagnosis, Fix and Relearn Read Post »
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/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 »
4L60E vs 4L80E: torque capacity, size, weight, how to tell them apart, which trucks got each, and when the 4L80E swap is actually worth it.
4L60E vs 4L80E: Differences, Strength and When to Swap Read Post »
6.0 Vortec specs for the LQ4, LQ9, LY6 and L96 — horsepower, torque, block and head material, applications, and which iron-block 6.0 is the one to build.
6.0 Vortec Specs: LQ4, LQ9, LY6 & L96 Horsepower, Torque and Differences Read Post »
GMT800 engine guide: compare the 4.8, 5.3, 6.0 and 8.1 Vortec — specs, reliability, towing, and which Silverado/Sierra engine to actually buy.
GMT800 Engine Guide: 4.8 vs 5.3 vs 6.0 vs 8.1 — Which to Buy Read Post »
