I have a 98 expedition with a 4.6L and the knock sensor needs to be replaced. I know that the its a long project and its under the upper intake. Is there a way to replace it without removing everything.
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Nathan, 2 Knock's are located under intake manifold.
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Yes you should be able to do this yourself. The part at autozone is about 42 bucks. The knock sensor is located on the right side of the engine block under the exhuast manifold on the V6. It should also be in the same general area on a V8.
It is somewhat complicated to change the knock sensors. There are two of them and they are located under the intake manifold. The intake manifold must be removed. I would recommend tha you replace both while you have the engine apart.
What leads you to believe the knock sensors are bad, I've seen few bad knock sensors? The knock sensor issues more times than not have been caused by other problems.
After you remove the intake manifold disconnect the knock sensor connectors. Remove the bolts and the two knock sensors then replace with new knock sensors tighten the bolts to 15 foot pounds. Reinstall manifold. The total job for an experienced mechanic with tools is about 5 hours. Not a good job for a beginner.