M42club.com - Home of the BMW E30/E36 318i/iS
DISCUSSION => Engine management => Topic started by: electrofelix on March 08, 2010, 04:44:18 PM
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Got an error code recently related to knock sensors and decided that while I was hunting down an idle problem which involved taking the upper inlet manifold off, I would see whether I could replace the front knock sensor without dismantling everything else. Hoping that's the problem one since it was more a general error about testing the knock sensors and the front one had a cracked cover.
Normally its considered that you need to remove the inlet manifold completely to get in there, but I've got the new one in place without doing that.
While it looks like its at the right angle (wire coming out is supposed to be at 70 degrees from vertical), its a little hard to judge. It seemed to me that the angle is pretty much about the only angle it could fit anyway with all the other parts around it.
So to the question, just how accurate does that angle have to be? Is a guesstimate that could be out by up to 5 degrees either way to extreme, or is it important to get it spot on (in which case I'll want to remove the lower inlet manifold as well). Or is the only reason for the angle so that if you had all the parts around it removed, you wouldn't be able to fit them back in place unless you put the knock sensor in with the correct angle on it.
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I am facing the same situation to replace the knock sensor. Did it work out and is the car running normal?
Norm
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I am not sure that angle is important, but I think it is quite important what torque you will use to tighten it.
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Thanks for they response. Very good point as I do recall reading that it was important to torque correctly to have sensor read and work properly. Wish I had changed the knock sensor when the engine was on the engine stand waiting to go into the current vehicle. :-(.