Question about 1998 Ford Expedition

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Expedition knock sensor

I have a 98 expedition with a 4.6L and the knock sensor needs to be replaced. I know that the its a long project and its under the upper intake. Is there a way to replace it without removing everything.

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NO.U HAVE TO REMOVE THE UPPER INTAKE

Posted on May 14, 2009

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I have a 2002 Nissan Frontier 3.3l v6 I'm about to change my knock sensor but I also need to change the camshaft position sensor but I'm not positive of where it is located it say bank 1??????


I'm willing to bet you have weak upper O2 sensors & there's nothing wrong with your knock sensor. But if you want, the knock sensor is under the lower intake manifold in the back that is located under the upper intake manifold also called the upper plenum. The lower intake manifold is wedged between the 2 heads and is an enormous pain in the azz to get to. You can check the O2 sensors with a scanning tool that will show you the upper sensors in bank 1 & 2 bouncing electrical current from about .5v to 5v several times per second. Anything less show weak sluggish sensors. The resulting lean mixture causes a knock. Change the sensors and the knock goes away and so does the engine light after you reset it. It took me 6 months to find this problem after replacing everything else including the 6mth old O2 sensors fresh from China. Now I have Bosch. PS The lower sensors went 2 weeks later & I was told any more problems it's the fuel regulator. 2001 Frontier 3.3l v6. No problems since, it purrs like a kitten. I'd suggest the Bosch, it's a special design for that 3.3l engine.

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1 Answer

Need to know how to install knock sensors and where they are need diagram. 2005 expedition 5.4 engine


Hello adamjerkins,

It is somewhat complicated to change the knock sensors. There are two of them and they are located under the intake manifold. The intake manifold must be removed. I would recommend tha you replace both while you have the engine apart.

What leads you to believe the knock sensors are bad, I've seen few bad knock sensors? The knock sensor issues more times than not have been caused by other problems.

After you remove the intake manifold disconnect the knock sensor connectors. Remove the bolts and the two knock sensors then replace with new knock sensors tighten the bolts to 15 foot pounds. Reinstall manifold. The total job for an experienced mechanic with tools is about 5 hours. Not a good job for a beginner.


Regards,
netvan

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1 Answer

WHERE IS LOCATED THE KNOCK SENSOR AND IDLE AIR CONTROL VALVE - NISSAN ALTIMA 98


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3 Answers

My 1997 nissan pathfinder p0325 code came up on the scanner, and I need to change my knock censor on the car. I do not known were this part is located on the engine


very familiar with this. it is down under the intake manifolds in the valley of the engine. it is a single wire connector. you must remove the manifolds to replace this item. parts will run you about $100 and take about 3-6 hours depending on your compentance. parts needed are 1. knock sensor 2. intake(upper and lower plenum gasket)set 3. coolant. make sure you drain your radiator prior to doing this as to not allow a bunch of coolant to drain into the cylinders and cause hydrolocking. if this happens you must remove the spark plugs and rotate the engine to spray out the liquid out of the cylinders then reinstall.

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1 Answer

I have a 98 nissan quest- needs knock sensor replaced, need to know where it's at!!!! And just how difficult it would be to do myself.


It is under the intake manifold, in the valley of the motor, can be difficult depends on your skill level.

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1 Answer

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yes, I have they are located between the 2 banks of the motor. you need to remove the upper intake manifold to get to them. not hard to do. Also its a good idea to replace the mini harness with them.

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I need to know the location


Hi, my 01 Mill. noc senser was on top of the motor, but under the intake! needless to say it cost alot... had other stuff done so I can't tell what cost was ($1800 total)

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Where is the Knock Sensor located on a 1994 Lexus ES300


  1. located on top of engine below intake manifoldgraphic.aspx?mod=reptiff&module_id=1&session_id=%7ba7aa889f-b7e3-42e1-9ece-3476a2533f69%7d&image_guid=95d24086&print_bw=0&

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1 Answer

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If The engine in your van is a 3.5L, the knock sensor is under the upper intake manifold. This has to be removed in order to access the sensor on top of the engine block. The job requires an upper intake gasket set and about 1.5 hours to do; if you are handy with tools. For those who aren't; better off leaving this one to the professionals.

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1 Answer

Need to find location knock sensor for replace


I know that the knock sensor for a 1998 Quest with a 3.0 is located on the passenger side of the engine compartment under the intake manifold. You should be able to find the wiring and connector next to the intake manifold. To access the sensor, you have to remove the upper and lower intake manifold. The sensor is on the block between the heads. Hope this helps.

Oct 05, 2008 | 2002 Nissan Quest

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