Do I have a knock sensor?
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Junior User
Joined: Sep 2007
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Do I have a knock sensor?
Do I have a knock sensor an is it hard to change?
I am trying to fix my ping and want to replace all of the sensors. O2, EGR, MAF etc. If that doesn't work I am probably going to have it rebuilt. Thats how sick I am of the ping.
I am trying to fix my ping and want to replace all of the sensors. O2, EGR, MAF etc. If that doesn't work I am probably going to have it rebuilt. Thats how sick I am of the ping.
Posting Guru
Joined: Mar 2005
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From: Burnsville, MN
If you're going to re-build the engine, why not try getting the carbon out first? Nothing to lose and it might possibly work..... Well, okay, I suppose it might screw up your cat...... or you could remove it. What do you lose by trying?
Another possibility would be gummed plugs, where the gunk remains hot enough to support some pre-ignition.
Another possibility would be gummed plugs, where the gunk remains hot enough to support some pre-ignition.
Posting Guru
Joined: Mar 2005
Posts: 2,060
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From: Burnsville, MN
Another point. While it is true that posters do occasionally complain of pinging, the vast majority of engines don't develop the problem. Do you run the revs almost up to 5,000 at least once every tankful of gas to blow out accumulated carbon build-up? Is this a citified showpiece, or a working man's truck? Does your engine idle smoothly or not?
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Junior User
Joined: Sep 2007
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I have had Ford do a carbon flush and tune up the engine and no change. The things that I have read about the ping is that it can be one of the sensors, but I am very frustrated. 117K miles. no other running problems. I know it is not supposed to do it
Sit. Stay.
Joined: Oct 2001
Posts: 18,308
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From: Washington State
Modern fuel injected engines don't get "carboned up" like old carburetor engines of yore. The need to "burn the carbon out" is no longer needed. They meter the perfect amount of fuel for each stroke and load.
The I cannot tell you the "exact" location of the sensor but I do believe it is underneath the intake manifold. Hopefully someone will clarify my very WAG (wild assed guess).
The I cannot tell you the "exact" location of the sensor but I do believe it is underneath the intake manifold. Hopefully someone will clarify my very WAG (wild assed guess).
Fleet Owner
Joined: Jan 2004
Posts: 26,007
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From: Brentwood,CA
The "knock" sensors are located on the front of the engine on both sides.You are looking for a small grey box that is mounted on each of the valve covers.
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Elder User
Joined: Sep 2007
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From: S CAL
Originally Posted by ford390gashog
The "knock" sensors are located on the front of the engine on both sides.You are looking for a small grey box that is mounted on each of the valve covers.
I was under the impression that in 2001 there was only one knock sensor on the V-10 and was not until 2005 that they went to two knock sensors.
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Brett Foote
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Joined: Jul 2002
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From: Long Island USA
There should be only one knock sensor, and I believe it's in the valley between the heads (under the intake) - Ford's book says remove the intake to get to it, but people on here have said they had no problem getting it out and back in without doing that 
I haven't looked for it on my '01 yet.
As for the ping - Did you try high octane gas yet? Try some 93 octane when you run the existing tank down to almost empty.
Report back.
I haven't looked for it on my '01 yet.
As for the ping - Did you try high octane gas yet? Try some 93 octane when you run the existing tank down to almost empty.
Report back.
Elder User
Joined: Apr 2004
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From: Sweet Home Alabama
I second the higher octane gas. I put a few gallons of premium in every tank. About 8-10 gallons of preimum with the rest low grade nets me an octane of over 88 which seems to fix nearly all pinging. All midgrade would do the same but cost a little more. Since I started mixing in a little premium, avg mileage increased by almost .5mpg. That is average increase over about 6000 miles so id say pretty accurate.
Bottom line is I do it for decreased noise and peace of mind. Works for me. A couple tanks of pure premium will cost you about $10 more per fill up. If it fixes the problem and you continue to run pure premium, it would still be cheaper than rebuilding it pre-maturely.
Bottom line is I do it for decreased noise and peace of mind. Works for me. A couple tanks of pure premium will cost you about $10 more per fill up. If it fixes the problem and you continue to run pure premium, it would still be cheaper than rebuilding it pre-maturely.
Cargo Master
Joined: May 2001
Posts: 3,208
Likes: 13
I would make sure that there are no vaccum leaks and the fuel pressure/flow is right before I would change the knock sensor. I also would imagine there is a pin point test for that part that would determine if it is good would do that before buying a new one. Also insure egr valve is working that can also cause ping. And if a slight uograde in fuel solves the problem then the added cost of fuel will probably be offset by a mileage increase due to the fact that the timing is not being retarded by the knock sensor. We see more deposits on the intake valves than we do in the combustion chambers these days which can cause a lean condition and pinging.
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