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WHAT SENSOR IS THIS!!!!!!!!!

 
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Old 12-19-2012, 11:20 PM
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WHAT SENSOR IS THIS!!!!!!!!!

Well today i removed my intake manifold to clean out my egr ports on it and all of that went well except for the gasket that was melted onto the block. well i got it all together and all the hoses and everything back in place and i was left with this one dangling sensor below the intake manifold right above the oil filter. Im not sure where it goes or which sensor this is but i tried starting it without and my car would rev from 2-4.5k by itself so i shut her off. it looks like the sensor needs to be replaced so im taking it to honda to buy a new one. but until then my car is undriveable so can someone give me the name of this sensor and where it should be plugged in? i drive a 1998 honda prelude 5 speed base.

in the picture the blue connection goes on to the sensor and in the second picture im holding the actual sensor that goes on to that connection im just not sure where that connection/sensor goes???????????????
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Old 12-20-2012, 12:15 AM
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Re: WHAT SENSOR IS THIS!!!!!!!!!

Knock sensor.


common to break when removing the intake manifold if you're unaware of it


expensive sucker
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Old 12-20-2012, 12:29 AM
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Re: WHAT SENSOR IS THIS!!!!!!!!!

x2 on what wing said. i broke mine switching to the euro-r manifold. i super glued mine back together, so it wasnt that bad, just threw a code. definitely replace it asap. quite expensive as wing said too
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Old 12-20-2012, 02:35 AM
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Re: WHAT SENSOR IS THIS!!!!!!!!!

I'm not even sure if mines is broken I'm going to plug it back up in the mornin and see how it goes. But not having the knock sensor would make the car rev up to 4.5k repeatedly?
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Old 12-20-2012, 03:20 AM
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Re: WHAT SENSOR IS THIS!!!!!!!!!

that sounds like a huge vac leak, the knock sensor retards the timing to prevent detonation due to spark knock.
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Old 12-20-2012, 07:36 PM
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Re: WHAT SENSOR IS THIS!!!!!!!!!

i have a knock sensor laying around if your willing to wait for it
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Old 12-20-2012, 07:40 PM
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Re: WHAT SENSOR IS THIS!!!!!!!!!

but like basic says it does sound like a vac leak because when i had broke mine changing the head gasket , i had no problem wat so ever other then a very anoying check engine light until i sold the car . i had bought one and never ended up installing it if you would like it .
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Old 12-20-2012, 08:45 PM
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Re: WHAT SENSOR IS THIS!!!!!!!!!

I bought a sensor today for 80 bucks because I couldn't wait on it I need it to be drivable ASAP but I tho k I have a big vac leak somewhere I have to fix in the morning. All this because of he ****ing egr system is **** in Hondas
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Old 12-20-2012, 08:51 PM
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Re: WHAT SENSOR IS THIS!!!!!!!!!

The EGR system is pretty easy to clean and maintain. Having a Euro-R intake manifold makes it even easier.
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Old 12-20-2012, 09:08 PM
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Re: WHAT SENSOR IS THIS!!!!!!!!!

I removed the intake manifold when I did mines so I could break it all down and deep clean it. The cleaning all went well but the old intake mani gasket had to be sanded off because it was fried onto the block I sanded it all down pretty even bring careful not to touch the block put it all back together and when I went to start it, revved straight to 4.5k down to 1k and back up and kept repeating
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Old 12-20-2012, 10:01 PM
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Re: WHAT SENSOR IS THIS!!!!!!!!!

Did you clean the IACV and egr valve?
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Old 12-21-2012, 03:06 AM
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Re: WHAT SENSOR IS THIS!!!!!!!!!

Spray some carb cleaner or starting fluid around the flange of the intake where it bolts to the head and also on any vac lines that were removed. If the engine revs up you found your leak. I suspect its the intake mount, really any thing else is too small for that kind of rpm increase. The sanding kinda scares me too, usually a razor blade and some steel wool will clean it up good.
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Old 12-21-2012, 12:12 PM
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Re: WHAT SENSOR IS THIS!!!!!!!!!

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Originally Posted by BasicConcepts View Post
Spray some carb cleaner or starting fluid around the flange of the intake where it bolts to the head and also on any vac lines that were removed. If the engine revs up you found your leak. I suspect its the intake mount, really any thing else is too small for that kind of rpm increase. The sanding kinda scares me too, usually a razor blade and some steel wool will clean it up good.
good advice.

I usually use a scotchbrite pad and some degreaser to clean up mating surfaces, works well.
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