Question about 2004 GMC Yukon
The person who stated they are under the intake manifold is a tool! They are located below the exhaust manifold(one on each side) and are quite simple to replace. Be sure not to overtighten them as they can become too sensitive and may cause detonation. Should be about 16 ftlbs but I would check to be sure. They run about 55 dollars each aftermarket and are about 85 from GM depending on where they are purchased from.
Posted on Oct 17, 2010
You actually have two knock sensors on this vehicle if it has a V8. They are located under the intake manifold, which you have to remove to replace them. Word of advice- if you choose to replace them yourself, get the sensors from GM. The aftermarket sensors have issues and you don't want to do this job twice.
Posted on Sep 17, 2010
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Posted on Jan 02, 2017
SOURCE: 2003 GMC Yukon
You will have to remove the intake manifold to gain access to the knock sensors. There are two sensors in the valley under rubber plugs. The sensor in the rear has a tendency to fill up with water and cause trouble. You have to make a dam with RTV to stop the water from getting in there.
Posted on Sep 06, 2008
There are 2 or them and they are under the intake manifold. The manifold has to be removed to replace them.
Posted on Oct 10, 2009
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SOURCE: how to repalce a knock sensor
Hi welcom to fixya.
A defective knock sensor may cause engine detonation or reduced spark advance and fuel economy. When a knock sensor is removed and replaced, the sensor must be tightened to its specified torque. If the knock sensor is installed tighter than it should be, it may become too sensitive and provide an excessively high voltage signal, resulting in more spark ****** than required. When the knock sensor is installed looser than it should be, the knock sensor signal will be lower than normal, resulting in engine detonation.
To replace the knock sensor:
Posted on Jul 09, 2010
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