Question about 2003 Chevrolet Avalanche
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Posted on Jan 02, 2017
SOURCE: knock sensor code, p0330
The knock sensors either work or they don't. When they do not, the light comes on. All that a knock senor is is a piezo crystal that vibrates at the frequency that is comparable to engine "knock", and sends that yes/no signal to the ECU. There are 2 knock sensors, and both are bolted to each side of the engine interior walls, under each cylinder head. You have to remove both of the intake manifolds to access the knock sensors and their wiring.
Price to pay? My flat rate book suggests 3.7 hrs to change both. 3.7 hrs times your local labour rate, plus the price of the 2 sensors and/or wiring, and the price for the gaskets for the upper & lower manifolds. Depending on your location, you could quickly spend over $500.00.
Posted on Oct 07, 2008
If The engine in your van is a 3.5L, the knock sensor is under the upper intake manifold. This has to be removed in order to access the sensor on top of the engine block. The job requires an upper intake gasket set and about 1.5 hours to do; if you are handy with tools. For those who aren't; better off leaving this one to the professionals.
Posted on Dec 09, 2008
I don't know where the knock sensor is exactly on this engine, but if you buy the replacement first it will help you identify it.
It's screwed into the block near the head or the head itself. It has an electrical connector attached to it (two wires, I believe).
The replacement is pretty simple: remove the electrical connector from the old one; screw it out with a wrench; screw the new one in and; plug the connector onto it.
Posted on Aug 22, 2009
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