Knock Knock
Thread Starter
TECH Fanatic
Joined: Nov 2004
Posts: 1,118
Likes: 0
From: TX
Knock Knock First. Can someone briefly describe how knock sensors work?
Second. Being that I have never so much as removed an intake manifold bolt, what are the probable reasons for both sets to be throwing codes?
Third. I have 55,000 miles. Do these things just go bad sometimes?
And last. Is it harmful for me to drive it as is?
I've been running 91 octane.
I have poly motor mounts but have had no problems with them for a while.
My over-axle exhaust pipe has been knocking around recently.
I have not disconnected anything in the engine compartment or driven through any puddles recently.
Thanks a bunch.
Second. Being that I have never so much as removed an intake manifold bolt, what are the probable reasons for both sets to be throwing codes?
Third. I have 55,000 miles. Do these things just go bad sometimes?
And last. Is it harmful for me to drive it as is?
I've been running 91 octane.
I have poly motor mounts but have had no problems with them for a while.
My over-axle exhaust pipe has been knocking around recently.
I have not disconnected anything in the engine compartment or driven through any puddles recently.
Thanks a bunch.
TECH Resident
Joined: Aug 2003
Posts: 970
Likes: 4
From: England UK
There are a form of microphone, sensing vibration. If they detect detonation/pinking they tell the PCM that something is wrong, and the PCM retards the timing as a safty measure.
If you are suddenly getting loads of knock and wasn't before, perhaps bad fuel? clogged fuel filter? certainly drive carefully, dont get hard on it, the knock sensors are telling you something is wrong. I would say its unusual for knock sensors to go wrong.
Really you need to do some logging to find out more info on this, post your results.
If you are suddenly getting loads of knock and wasn't before, perhaps bad fuel? clogged fuel filter? certainly drive carefully, dont get hard on it, the knock sensors are telling you something is wrong. I would say its unusual for knock sensors to go wrong.
Really you need to do some logging to find out more info on this, post your results.
On The Tree
Joined: Dec 2004
Posts: 100
Likes: 0
From: Satellite Beach, fl
Thread Starter
TECH Fanatic
Joined: Nov 2004
Posts: 1,118
Likes: 0
From: TX
So I finally pulled out my service manual. it says to check the knock sensor harness jumper located at the rear of the intake manifold.
I dont know what its talking about. I looked around and everything i could see seemed fine and I dont know how anything could work itself loose, they all have those blue plastic retainer clips on them.
So this is where i go off to the dealership.
I dont know what its talking about. I looked around and everything i could see seemed fine and I dont know how anything could work itself loose, they all have those blue plastic retainer clips on them.
So this is where i go off to the dealership.
I am having the same problem believe it or not. Knock sensors are going off after motor install. I have also installed poly motor mounts (coincedence?).
I am convinced these knock sensors are killing my power. Let us know what you find out...
I am convinced these knock sensors are killing my power. Let us know what you find out...
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Thread Starter
TECH Fanatic
Joined: Nov 2004
Posts: 1,118
Likes: 0
From: TX
Yeah, if you're throwing the code too.. i believe we are both running rich rich rich.. so it will def choke off some power.
I've not touched anything on my car in some time and the poly mounts went on a long time ago and i've never heard anyone esle have problems from the motor mounts, only trans mounts.
And since my code comes on immediately after i start, im pretty sure i just have a loose or maybe wet connection somewhere.. just dont know where.
I've not touched anything on my car in some time and the poly mounts went on a long time ago and i've never heard anyone esle have problems from the motor mounts, only trans mounts.
And since my code comes on immediately after i start, im pretty sure i just have a loose or maybe wet connection somewhere.. just dont know where.
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hope i hope they got it back on right.