Knock sensor wont come out!! Help!!!!
Thread Starter
Instructor
Joined: May 2010
Posts: 143
Likes: 0
From: Greenwood LA.
Knock sensor wont come out!! Help!!!!
OK, Well I was going to replace both knock sensors on my 01 Z06 because I had a code that said the front sensor was bad. Rear sensor comes right out! The front one will not turn the entire sensor. ITs turning the center part but not the outside which I assume it should all turn. How in the hell do I get this sensor out??? ANYONE EVER seen this before?? Appreciate ANY pointers on this one guys.
Tech Contributor
Joined: Aug 2008
Posts: 2,902
Likes: 21
From: Oak Hill Virginia
OK, Well I was going to replace both knock sensors on my 01 Z06 because I had a code that said the front sensor was bad. Rear sensor comes right out! The front one will not turn the entire sensor. ITs turning the center part but not the outside which I assume it should all turn. How in the hell do I get this sensor out??? ANYONE EVER seen this before?? Appreciate ANY pointers on this one guys.
Last edited by cdkcorvette7; Sep 15, 2011 at 04:48 PM. Reason: Fixed info... Thanks lucky
Tech Contributor
Joined: Jan 2007
Posts: 19,401
Likes: 1,144
From: Dyer, IN
Tech Contributor
Joined: Aug 2008
Posts: 2,902
Likes: 21
From: Oak Hill Virginia
Thread Starter
Instructor
Joined: May 2010
Posts: 143
Likes: 0
From: Greenwood LA.
NO,I have the connector off. Its the center of the sensor itself thats turning but not turning the bottom bolt on the sensor. Thanks for the reply anyhow. I just hope im not the ONLY person this has happened to. Im sure there is a way to get it out but if someone has done it would save LOTS of time.
Thread Starter
Instructor
Joined: May 2010
Posts: 143
Likes: 0
From: Greenwood LA.
Thread Starter
Instructor
Joined: May 2010
Posts: 143
Likes: 0
From: Greenwood LA.
OK I think your talking about the valley cover that has the bolts in it. From the photos I saw the Sensor has to be removed to get the cover off. So that will not help me in this case. IM going to have to figure a way to unscrew the sensor. Maybe someone has seen this problem before and will give me some pointers.
Last edited by Speedway1; Sep 15, 2011 at 09:12 PM.
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!
Joe Kucinski
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter
Joe Kucinski
8 Coolest Corvette Pace Cars (and Replicas) of All Time
Verdad Gallardo
Top 10 Corvette Engines RANKED by Peak Torque (70+ Years of Muscle!)
Joe Kucinski
Corvette ZR1X Will Be Pacing the Indy 500, And Could Probably Race, Too!
Verdad Gallardo
Top 10 Corvettes Coming to Mecum Indy 2026!
Brett Foote
Top 10 C9 Corvette MUST-HAVES to Fix These C8 Generation Flaws!
Michael S. Palmer
10 Revolutionary 'Corvette Firsts' Most People Don't Know
Joe Kucinski
5 Reasons to Upgrade to an LS6-Powered Corvette; 5 Reasons to Stay LT2
Michael S. Palmer
Tech Contributor
Joined: Aug 2008
Posts: 2,902
Likes: 21
From: Oak Hill Virginia
OK I think your talking about the valley cover that has the bolts in it. From the photos I saw the Sensor has to be removed to get the cover off. So that will not help me in this case. IM going to have to figure a way to unscrew the sensor. Maybe someone has seen this problem before and will give me some pointers.
I can't remember offhand if the larger center section turned with the bolt head or not. Look at your replacement part and see if they are attached or not...
Last edited by cdkcorvette7; Sep 15, 2011 at 10:04 PM.
Thread Starter
Instructor
Joined: May 2010
Posts: 143
Likes: 0
From: Greenwood LA.
I didn't take the valley cover off when I replaced my sensors... They just unscrew with a 22mm socket. So if the head of the bolt is turning with the wrench (and it's not broken) then it has to be coming loose... Just unscrew it then reach in there (or grab it with some pliers if you can't get your fingers in there) and pull it out. There shouldn't be any resistance.
I can't remember offhand if the larger center section turned with the bolt head or not. Look at your replacement part and see if they are attached or not...
I can't remember offhand if the larger center section turned with the bolt head or not. Look at your replacement part and see if they are attached or not...
Tech Contributor
Joined: Aug 2008
Posts: 2,902
Likes: 21
From: Oak Hill Virginia
Just so I'm clear... In the image below you're saying that the piece with the blue arrow pointing to it is turning and the piece with the red arrow pointing to it is not right?
Are you sure the hex head on the bolt isn't stripped and is actually turning? Have you looked at your replacement sensor to see if those pieces are attached to each other or are separate and able to rotate independently?
Are you sure the hex head on the bolt isn't stripped and is actually turning? Have you looked at your replacement sensor to see if those pieces are attached to each other or are separate and able to rotate independently?
Tech Contributor
Joined: Jan 2007
Posts: 19,401
Likes: 1,144
From: Dyer, IN
Tech Contributor
Joined: Aug 2008
Posts: 2,902
Likes: 21
From: Oak Hill Virginia
As I understand it a knock sensor is just a microphone of sorts. It "listens" for engine knock (detonation inside the combustion chambers). If the sensor detects knock it sends a signal to the pcm which will retard the timing until the sensor doesn't "hear" it anymore.
Tech Contributor
Joined: Aug 2008
Posts: 2,902
Likes: 21
From: Oak Hill Virginia
Pro
Joined: Aug 2011
Posts: 721
Likes: 0
From: Lexington Kentucky
Tech Contributor
Joined: Dec 1999
Posts: 32,910
Likes: 2,402
From: Anthony TX
CI 6,7,8,9,11 Vet
St. Jude Donor '08
You may have found out why the front one was bad.
That means that you may have to dissect it to get it out. Get your drill out and start dismantling it to get to a part that will allow the main body below the center section to turn.
Bill
That means that you may have to dissect it to get it out. Get your drill out and start dismantling it to get to a part that will allow the main body below the center section to turn.
Bill
Thread Starter
Instructor
Joined: May 2010
Posts: 143
Likes: 0
From: Greenwood LA.
I see no other way to go at it Bill. Will update if I make any progress. Thanks
Thread Starter
Instructor
Joined: May 2010
Posts: 143
Likes: 0
From: Greenwood LA.
Just so I'm clear... In the image below you're saying that the piece with the blue arrow pointing to it is turning and the piece with the red arrow pointing to it is not right?
Are you sure the hex head on the bolt isn't stripped and is actually turning? Have you looked at your replacement sensor to see if those pieces are attached to each other or are separate and able to rotate independently?
Are you sure the hex head on the bolt isn't stripped and is actually turning? Have you looked at your replacement sensor to see if those pieces are attached to each other or are separate and able to rotate independently?
Tech Contributor
Joined: May 2008
Posts: 3,100
Likes: 17
From: Somers, CT and Clermont, FL
St. Jude Donor '09-'10-'11-'12-'13-'14-'15-'16
At this point, you might as well remove the lifter valley cover to see, from underneath, if the threads are stripped and just turning.
You may end up having to drill the sensor out, and then repair the damaged valley cover threads with a Helicoil.
You may end up having to drill the sensor out, and then repair the damaged valley cover threads with a Helicoil.