Knock sensor - Chevy Impala SS Forum
 
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post #1 of 8 (permalink) Old 09-04-2018, 09:14 PM Thread Starter
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Knock sensor

Just asking if it would be safe to remove a knock sensor with a impact wrench cuz i just cant get it off with anything else
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post #2 of 8 (permalink) Old 09-04-2018, 09:51 PM
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As long your plan on replacing it after that, I see no arm.

The unit is very sensible, and if the round part start spinning it wont come out, its now broken. Impact should take care of that in a microsecond (damage it)

Try vise grip or something on the big fat round part, but once spinning loose its over.

New ones are cheap. plan accordingly of your time usage.

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post #3 of 8 (permalink) Old 09-04-2018, 09:59 PM Thread Starter
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Yea im replacing both but what do you mean once it spins its over? Like i HAVE to replace the knock sensor? Or like theres no way i can take it out after that
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post #4 of 8 (permalink) Old 09-04-2018, 10:36 PM
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Yea im replacing both but what do you mean once it spins its over? Like i HAVE to replace the knock sensor? Or like theres no way i can take it out after that
"If" the outer shell that is part of where you put wrench on breaks away from the threaded shaft hat goes into block it just spins.. Cut off wheels, vice grips, etc are then needed to get the sensor out of block

and yeah the sensor is destroyed
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post #5 of 8 (permalink) Old 09-05-2018, 11:13 AM
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"i just cant get it off with anything else"

If it's stuck to the point you are asking about using an impact, then it will be likely destroyed, and even harder to access. Use the LOWEST SETTING on a smaller impact, not a unit designed for lug nuts.................. that may help. But this is a terrible method.

What exactly have you done, what tools and procedure?

Is this a modified, not a stock setup or some other reason you can't use the normal tools?

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post #6 of 8 (permalink) Old 09-05-2018, 11:54 AM
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Not an orthodox solution but I have had some tough items to remove. Just two days ago I was removing a brake line fitting that someone had rounded the flat a bit. I tried a line wrench and it was a no go. Since I intend to replace the line I just put a small pipe wrench on it. I also had to do this with a broken knock sensor. The thin shell on them collapse easily.

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post #7 of 8 (permalink) Old 09-05-2018, 01:39 PM
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Just asking if it would be safe to remove a knock sensor with a impact wrench cuz i just cant get it off with anything else
some have had problems with the removal .. most likely using a 12 point socket..

use 6 point socket .. also I did remove these @20K miles 2 yrs old back in 1997..

put a pipe dope compound used on pipe threads have had no problems removing over all the complete coolant changes.

if it is dropped then its broken .. impacts of any on the sensor will kill it.. also the sensor will throw a code quickly it is bad,,,.
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post #8 of 8 (permalink) Old 09-06-2018, 06:56 AM
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I see youre fairly new here and these cars along with a lot of your questions have already been covered pretty well. Get familiar with using the "Search" option and look thru threads til you find what you need. A benefit to that is you may also pickup on other stuff as you search thru threads. I just searched "Knock Sensor removal" to locate this link below.

One thing I felt I needed to add here is DO NOT use any additional "Pipe Dope Compound" or Thread Sealant on the KS threads. This can affect the readings of the KS and is flat out not needed. The KS should already have sealant on the thread from the supplier. No more is needed and more can affect the sensitivity. ASlso, be mindful of the low torque used to install these, i believe it is only 14 foot lbs.

I posted a few times in this thread and Post 22 of this has some info and a couple of helpful links but try to read thru all of the posts in each threads as others may also provide some useful info. I've done this a few times to flush the coolant and the first time was a chore to get removed. It also helps to remove items to allow more clearance to get to those little buggers. For example, removing the Starter will allow much greater access to a stubborn KS on the pass side and is an easy remove. once the lid of the KS is broken, it will just spin on the KS housing and you could try to re-weld the lid or may need to grip the body with Vice Grips but it is a tight area with bad angles. Here is the thread I mentioned....

https://www.impalassforum.com/vBulle...olant-not.html

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