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Username Post: knock sensor?????        (Topic#229314)
tommy8604 
Forum Newbie
Posts: 12

Reg: 06-08-09
11-08-09 09:45 PM - Post#1802109    

ok so the check engine light come on and it says knock sensor 2. well since this has come up my truck (06 1500 5.3) will start missing when i stomp the gas and also my fuel milage has went all to crap. Do you think its the knock sensor or bad connection and where do i start? Trying to avoid pulling the intake if i can.
2006 chevy silverado 1500 crew cab Z71 5.3
1940 chevy special deluxe


 
wagonman100 
Super Senior Member
Posts: 13551
wagonman100
Loc: Baltimore, MD
Reg: 11-27-04
11-09-09 05:13 AM - Post#1802172    
    In response to tommy8604

Welcome to CT. I'm not extremely familiar with knock sensors, but I do know they are like a microphone and tell the computer to pull timing out when they sense noise. I don't know exactly where they are on your truck. I know they used to be mounted in the side of the block towards the front of the motor. If one is bad or has a bad connection, the computer could be pulling timing out at the wrong time and it will mess with your mileage. It really shouldn't make the engine miss unless maybe it does that under extreme circumstances (again, not too familiar with them). If you have to pull the knock sensor, drain the fluid out of your radiator. Some fluid is still going to come out of the block, but not as much as if you leave the radiator full and can't get a new one in fast. If you replace it, have the new one ready to go in to lose as little as possible. You shouldn't have to pull the intake to fix this problem. It sounds like it is either the sensor or an electrical problem.
Jay
Some days it's not worth chewing through the restraints.

1999 Silverado Z71 4X4 extra-cab short bed
1983 Malibu Fauxmad - tubbed
1978 El Camino Kustomized
1972 Monte Carlo
1957 210 handyman wagon
1957 Nomad sport wagon


 
mwright1 
Senior Member
Posts: 656

Loc: Naperville, IL
Reg: 04-05-04
11-09-09 06:49 AM - Post#1802214    
    In response to wagonman100

The knock sensors are under the intake manifold. The intake has to come off to get to them.

As Redvett01 well stated in another post on knock sensors. Here's the Link to that post.

  • Quote:
They are under the intake manifold and when you change them both, make sure you replace the wire harness to the main harness and do the silicone TSB around the sensors. Be sure you use the correct torque on the sensors too

If it ain't broke open it up and make it better 03 Silverado 5.3 Z71


 
LoneRanger817 
Forum Newbie
Posts: 17

Reg: 11-11-08
11-09-09 06:53 PM - Post#1802612    
    In response to mwright1

I've had this same code on my 02 Burb. I checked it @ Oreilly's and had him turn it off there. It hasn't come back in over 300 miles... could it have been a fluke, or is this something I'm going to have to replace both sensors as well on? Everything seems to be running great...on a side note, right after getting that code, I ran Sea Foam through it (I have just purchased this Burb and wanted to 'clean it up'). Maybe that cleared the issue up??

 
tommy8604 
Forum Newbie
Posts: 12

Reg: 06-08-09
11-09-09 10:17 PM - Post#1802779    
    In response to LoneRanger817

yea i bought a manual and it told me how to do it but i was looking and there is a wire coming up on the driver side from under the intake and to the top. i was wondering if this is the sensor wire or not? and i knew it would mess with my milage but didnt know if it would cause it to start missing?

ive got a code reader and ive erased it a couple times but it just comes right back a few miles down the road.
2006 chevy silverado 1500 crew cab Z71 5.3
1940 chevy special deluxe


 
wagonman100 
Super Senior Member
Posts: 13551
wagonman100
Loc: Baltimore, MD
Reg: 11-27-04
11-10-09 05:37 AM - Post#1802860    
    In response to tommy8604

Thanks for clearing up the location for me. Now I know where mine are in my Silverado if I ever have a problem.
Jay
Some days it's not worth chewing through the restraints.

1999 Silverado Z71 4X4 extra-cab short bed
1983 Malibu Fauxmad - tubbed
1978 El Camino Kustomized
1972 Monte Carlo
1957 210 handyman wagon
1957 Nomad sport wagon


 
tommy8604 
Forum Newbie
Posts: 12

Reg: 06-08-09
11-11-09 07:43 PM - Post#1804168    
    In response to wagonman100

They are under the intake manifold. #1 is in the front and #2 is in the back right on top of the motor
2006 chevy silverado 1500 crew cab Z71 5.3
1940 chevy special deluxe


 
bruno8241 
Forum Newbie
Posts: 11
bruno8241
Age: 43
Loc: Trenton,Ohio
Reg: 11-14-09
11-16-09 05:18 PM - Post#1807011    
    In response to tommy8604

I changed both of mine yesterday was not that hard just time consuming and expensive $120 2 sensors and an intake gasket set.I left the fuel rails and injectors on the intake. I had to go back to Autozone to get a fuel line separator tool for the two fuel lines on the driverside. I have many pictures of doing it I'll post them if I figure out how!!lol.
2000 Silverado Z71 4x4 Extended Cab Stepside
5.3 Auto Single Exhaust Straight Pipe 4" SS Tip
Bilstien Shocks
K&N Drop In Air Filter
Pioneer SuperTuner 3D Headunit
Sony Explode Speakers
Orion Cobalt 230 Amp/12"Crunch subs


 
tommy8604 
Forum Newbie
Posts: 12

Reg: 06-08-09
11-16-09 07:11 PM - Post#1807105    
    In response to bruno8241

thanks. pictures would be great if you get it figured out. im hoping i can reuse my gasket but i dont guess ill know till i get time to do it.
2006 chevy silverado 1500 crew cab Z71 5.3
1940 chevy special deluxe


 
wagonman100 
Super Senior Member
Posts: 13551
wagonman100
Loc: Baltimore, MD
Reg: 11-27-04
11-16-09 07:25 PM - Post#1807124    
    In response to tommy8604

There is a tutorial on posting pic on Chevy Talk. You just have to belong to a photo hosting site (they are free for a limited number of pics) or be a supporting member on here. I belong to Imageshack, but there are many others. You just upload the pic onto your account and copy and paste the appropriate URL into your post and the pic will show up in the post. It will just show the URL in the text before you hit add post.
Jay
Some days it's not worth chewing through the restraints.

1999 Silverado Z71 4X4 extra-cab short bed
1983 Malibu Fauxmad - tubbed
1978 El Camino Kustomized
1972 Monte Carlo
1957 210 handyman wagon
1957 Nomad sport wagon


 
bruno8241 
Forum Newbie
Posts: 11
bruno8241
Age: 43
Loc: Trenton,Ohio
Reg: 11-14-09
11-18-09 05:56 PM - Post#1808235    
    In response to bruno8241

http://s811.photobucket.com/albums/zz40/bruno8241 /

Here are some pics and info hope they work!!!lol!!!
2000 Silverado Z71 4x4 Extended Cab Stepside
5.3 Auto Single Exhaust Straight Pipe 4" SS Tip
Bilstien Shocks
K&N Drop In Air Filter
Pioneer SuperTuner 3D Headunit
Sony Explode Speakers
Orion Cobalt 230 Amp/12"Crunch subs


 
bruno8241 
Forum Newbie
Posts: 11
bruno8241
Age: 43
Loc: Trenton,Ohio
Reg: 11-14-09
11-18-09 06:03 PM - Post#1808243    
    In response to bruno8241

When you pull the grey clips up on the injector connectors don't pull them up very far they are tricky to get back on. And make sure you either number the way they are in the black tubing it's not that bad but u would have a mess if u could'nt remember were each one went
2000 Silverado Z71 4x4 Extended Cab Stepside
5.3 Auto Single Exhaust Straight Pipe 4" SS Tip
Bilstien Shocks
K&N Drop In Air Filter
Pioneer SuperTuner 3D Headunit
Sony Explode Speakers
Orion Cobalt 230 Amp/12"Crunch subs


 
bruno8241 
Forum Newbie
Posts: 11
bruno8241
Age: 43
Loc: Trenton,Ohio
Reg: 11-14-09
11-18-09 06:19 PM - Post#1808256    
    In response to tommy8604

I don't think you can reuse them the orange gasket material was mashed down to th black plastic frame of the gasket itself and mine were leaking oil bad already, did'nt know it before the job but whose to say they were'nt sucking air also !!hummm It's amaising how much oil gets inside the intake and intake port on the head the black in the pics is oil caked in them but naturally were the fuel spray was hitting was spotless...
2000 Silverado Z71 4x4 Extended Cab Stepside
5.3 Auto Single Exhaust Straight Pipe 4" SS Tip
Bilstien Shocks
K&N Drop In Air Filter
Pioneer SuperTuner 3D Headunit
Sony Explode Speakers
Orion Cobalt 230 Amp/12"Crunch subs


 
tommy8604 
Forum Newbie
Posts: 12

Reg: 06-08-09
11-20-09 07:22 PM - Post#1809472    
    In response to bruno8241

thanks alot for the pictures... im going to try and get mine done this next week...
2006 chevy silverado 1500 crew cab Z71 5.3
1940 chevy special deluxe


 
Edwin Butler 
Forum Newbie
Posts: 1

Reg: 11-21-09
11-25-09 07:14 PM - Post#1812490    
    In response to tommy8604

I read everything in here,because I had bad knock sensors to, I did mine last weekend the one at the front of the engine turned out with no problem the back one had rusted out and when I put my socket on it everything came out except the stud could'nt get nothing down there to lock on it and turn it out,I have a lincoln 175 mig welder so I sit a 5/8 nut over the stud and zapped it ,took a socket and got it out,well its all back togeather and running like new again it took about 4 hours to do the job,my chevy silverado 4x4 has 160000 miles on her and this was the first major thing done to it,if you have to weld on yours like I did, hook your ground cable to the nut for it don't run the current through your motor, and take damp rags and cover your cam ports up for no splatter can hit your cam . Good luck its not that hard of a job to do

 
2plus2 
Member
Posts: 458
2plus2
Loc: Langley,BC
Reg: 02-03-05
11-25-09 09:58 PM - Post#1812614    
    In response to Edwin Butler

another thing to do is take some RTV and seal up the sensor plug covers
also remove the 2 pieces of foam under the intake
more water gets in past the intake/head area than the foam lets out
69 canadian pontiac 2+2
factory L48 350 chev,TH350,PW,PT
99 silverado rclb 4.8 nv4500 14bsf 4.10's locker 6" procomp 35 bfg m/t's 9k winch cutout flares
92 s10,bead locked 38 tsl's,d44,9inch,spools,sm 465/np208/np241,exo cage


 
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