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Knock Knock...

 
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Old 01-15-2011, 04:38 PM
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Icon5 Knock Knock...

Hello. Recently i swapped heads on my 92 4ws. during the operation we found that i needed a new knock sensor so we ordered one online. 40 bones shipped wasnt that bad. but ive been driving my lude around and after a certain RPM (about 3k, little less) the CEL comes on. at first when i checked it, the code was for the coolant pressure so i replaced the radiator cap and it shut it off... but now when i pull the code, it comes up as 23 (knock sensor). but when i test it the code stays off...

by test i mean hold it steady at 3.5k rpm for 15 seconds. that is supposed to throw code 23, but does not.

whats wrong with my prelude?
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Old 01-15-2011, 05:25 PM
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Re: Knock Knock...

bump?
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Old 01-15-2011, 05:45 PM
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Re: Knock Knock...

who the fukkkk are you?????????????
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Old 01-15-2011, 05:58 PM
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Re: Knock Knock...

thanks for the help Mr. Red-Name.
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Old 01-16-2011, 01:31 AM
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Re: Knock Knock...

mine did that same thing and it ended up the clip on the sensor broke and it came unplugged, take a look to make sure its still plugged in.
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Old 01-16-2011, 03:43 AM
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Re: Knock Knock...

I want a colored name! Lol

So it doesn't throw a knock code when you test it? I know with the 5th gen it won't throw the knock sensor code until it's warmed up in "ready" mode

When exactly does the cel come on?
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Old 01-16-2011, 05:17 AM
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Re: Knock Knock...

it wont come on until after full temp, but it also stays off completely if i keep the rpms less than 3K.

and im pretty sure the clip is fine because when we unplugged the old, it was a bitch, and trying unplug the new is the same.

...i was told that the plug i purchased was made for h23 but would also fit many other motors. is there a special one just for the h23?
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Old 01-16-2011, 11:38 AM
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Re: Knock Knock...

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Originally Posted by 00CDMLUDER View Post
I want a colored name! Lol

So it doesn't throw a knock code when you test it? I know with the 5th gen it won't throw the knock sensor code until it's warmed up in "ready" mode

When exactly does the cel come on?
that's racist.

ted I dunno how to fix your problem, I don't have that motor mang.
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Old 01-16-2011, 01:54 PM
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Re: Knock Knock...

i should have asked this first
what kind of fuel are you using
and have you seafoamed your engine recently
also if the sensor is clipped in there nice and snug i doubt its the problem,that was just my case but they do come unplugged and the higher the RPM the more chance you have for pre det
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Old 01-16-2011, 02:43 PM
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Re: Knock Knock...

i run 93 bro. lol and actually yes, i seafoamed it the day it blew the fuk up...never again
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Old 01-16-2011, 02:50 PM
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Re: Knock Knock...

check your plugs,and clean your injectors if that don't work id say its the sensor
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Old 01-16-2011, 02:52 PM
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Re: Knock Knock...

werd. when i took the plugs out, they had changed themselves?!? wheres my fuxxin NGKs?
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LOL my comment gets removed but the ricer can tell me to go **** myself.... awesome.
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Old 01-29-2011, 06:55 PM
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Re: Knock Knock...

also, after a little more checking, it only will come on in 4th gear (auto pos) just after 55mph.

i drove it 40 miles the other night of back roads, slow driving, and i kept the rpms as low as i could. never hit 50mph or anywhere near 3k rpm. it stayed off the entire time. then the next day i drove to the local gas station and left it running to get it to temp, then when i left i hit 55mph and 3k rpm at the same time and CEL instantly clicked on.

anyone have the same issues?
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Old 02-10-2011, 06:33 PM
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Re: Knock Knock...

I'm having the same issue. except I'm having a idle issue as well. At times it idles great and other times not so great. but people have said something about fuel pressure and I just noticed after filling the tank it seemed to idle better so it might be that.

But anyways knock sensor like you was saying. I bought the same 40 dollar sensor off ebay. Stuck it in and cleared the codes...drove it all last night. Had it full temp and was even running the crap outta it and no knock sensor...then this morning I was driving to work...highway speed and up to temp and boom. There was a cel. Checked it when I got home and yeah damn code 23.
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Old 02-10-2011, 06:36 PM
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Re: Knock Knock...

we need to boycott ebay knock sensors...
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Old 02-10-2011, 08:15 PM
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Re: Knock Knock...

Shame shame for buying an eBay knock sensor!!!

But yeah, definitely replace it with a better quality unit (i.e. OEM) and that should help. I know OEM stuff is expensive but you just gotta bite the bullet sometimes. I'm getting ready to shell out $200 just for a ****ing CKP sensor. Ugh.
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