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Standard - Just The Facts
Just The Facts
Accelerator Pedal Sensors
Air Charge and Manifold Temperature Sensors
Airbag Clock Springs
Anti Lock (ABS) Sensors
Anti Lock Brake (ABS) Sensors Testing
Barometric Pressure (BARO) Sensors
Brake Pad Wear Sensors
Camshaft and Crankshaft Position Sensors
Camshaft Synchronizer Assemblies
Coolant Temperature Sensors
COP Boot and Pigtail Socket Assortments
Daytime Running Light Kits
DIS Control Modules
Don't Get PO'ed with PO401 Codes
EGR Position and EGR Pressure Sensors
EGR Valves
Fuel Injectors
Fuel and Water Separator Sensor
Ignition Coil Testing
Ignition Coil on Plug (COP)
Knock (Detonation) Sensors
MAF (Mass Air Flow) Sensors
MAP (Manifold Absolute Pressure) Sensors
Oxygen (O2) Sensors
T Series Fuel Injector line addition
Throttle Position Sensors
Tire Pressure Monitoring (TPMS) Sensors
TPMS Service and Repair
Two or Four, That is the Question
Vehicle Speed Sensors
Vehicle Warning Lights
Water Intrusion and Premature Coil Failure (UF303)
YAW Rate Sensors



Coils and Water Don't Mix!
On some GM models, water intrusion will cause premature failure of the coil and spark plugs— it's not a coil problem!

Signs of Premature Failure
If a customer complains of a rough idle and/or the MIL/SES light flashes on after a rain shower or car wash, this may indicate water intrusion.
Check for possible DTC codes P0300 through P0306 and inspect the coils and spark plugs. If upon inspection of the coils, a white chalk-like build-up on the inside and/or outside of the spark plug boots is detected, the coils have been damaged and must be replaced—Standard hi-quality UF303 coils should be installed. It is also advised that the spark plugs be replaced.

The Remedy
Water can seep past the engine cam cover and collect below the coils in the spark plug wells of the cylinder head resulting in a possible misfire. To prevent this condition from reoccurring, the AIP seal must be replaced with a replacement seal that redirects the water away from the engine cam cover.

Vehicles Involved
4.2 Inline 6 cylinder LL8 Engine
(VIN code S – PRO LL8)
2004-2007 Buick Rainier
2002-2007 Chevrolet TrailBlazer
2002-2007 GMC Envoy
2002-2004 Oldsmobile Bravada
2005-2007 Saab 9-7X



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