Knock Sensor Question
Thread Starter
Racer
Joined: May 2004
Posts: 295
Likes: 3
From: Newton NJ
Knock Sensor Question
I replaced my knock sensor this weekend and excepted to get soaked with coolant, but it didn't happen. Is this something to be worried about? There was just a small amount on the sensor itself and a little inside the block. The car was on jack stands and I did not drain any coolant before hand.
Car is an 87 l-98 auto, knock sensor came up bad following FSM testing. I'm not having a cooling issues, just had occasonial engine knock under load. Since replacing the sensor all is good according to my ear and datamaster.
TIA
cmontel
Car is an 87 l-98 auto, knock sensor came up bad following FSM testing. I'm not having a cooling issues, just had occasonial engine knock under load. Since replacing the sensor all is good according to my ear and datamaster.
TIA
cmontel
Race Director
Joined: Sep 2000
Posts: 17,298
Likes: 32
From: The Top of Utah
The knock sensor threads into the block drain hole in the right side of the block. Your description is one of "deferred maintenance". When is the last time, and how often, do you thoroughly flush your cooling system? The only thing that prevented your taking a shower was rust flakes and sediment blocking the drain hole.
RACE ON!!!
RACE ON!!!
Thread Starter
Racer
Joined: May 2004
Posts: 295
Likes: 3
From: Newton NJ
I changed the coolant last summer, when I replaced the water pump. I have only owned the car for two years. I'm not sure if the prior owner did any maintenance, it seems like the car was barely touched. Everything looked original including all the fluids.
I quess I will be changing the coolant and again this summer using a my local mechanic and a power flush system.
Thanks for the quick reply CFI-EFI
I quess I will be changing the coolant and again this summer using a my local mechanic and a power flush system.
Thanks for the quick reply CFI-EFI
Team Owner
Joined: May 2002
Posts: 24,337
Likes: 25
From: San Diego , CA Double Yellow DirtBags 1985..Z51..6-speed
Mine had solid metal behind it. (Surely CFI will tell me I'm hallucinating). Perhaps the holes didn't make it all the way into the water jacket on some blocks. Yours obviously had at least some opening, but maybe not much.
Race Director
Joined: Feb 2004
Posts: 12,517
Likes: 19
Originally Posted by CentralCoaster
Mine had solid metal behind it. (Surely CFI will tell me I'm hallucinating). Perhaps the holes didn't make it all the way into the water jacket on some blocks. Yours obviously had at least some opening, but maybe not much.
Melting Slicks
Joined: Mar 2003
Posts: 2,898
Likes: 0
From: Oklahoma City Oklahoma
My car is meticulously maintained, especially the fluids. When I changed out my knock sensor, I might have gotten three drops of coolant on the driveway. I too expected a shower, but I'm not going to look a gift horse in the mouth.
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Racer
Joined: Nov 2004
Posts: 445
Likes: 0
Originally Posted by cmontel727
Thanks everyone for your posts!!
I will flush and refill my coolant and call it day on this issue. Sounds hopeful that the insides of my engine are not a total mess
Perhaps when you flush your coolant, it might be an idea to remove your ks again and pry in to it's recess to see what is in there...!
Race Director
Joined: Sep 2000
Posts: 17,298
Likes: 32
From: The Top of Utah
Originally Posted by CentralCoaster
Mine had solid metal behind it. (Surely CFI will tell me I'm hallucinating). Perhaps the holes didn't make it all the way into the water jacket on some blocks. Yours obviously had at least some opening, but maybe not much.
RACE ON!!!
Race Director
Joined: Jan 2005
Posts: 10,641
Likes: 13
From: Slidell Louisiana
Was your system sealed when you pulled the sensor? I have removed knock sensors on my car and if I leave the pressure cap on I can remove and replace the sensor without getting douched. Now if I remove the cap the water streams out instead of dribbling .
Intermediate
Joined: Apr 2002
Posts: 48
Likes: 0
From: corbin ky
sludge and rust scale is what it is. once again cfi-efi is correct. i just removed knock senser and block plug yesterday and no antifreeze would drain. it looked like solid metal in there. when you start probing and scraping the recess of the bolt hole, be sure to have eye goggles on. there's alot of fluid in there.
