help problem after changing knock senser
Thread Starter
Drifting
Joined: Mar 2003
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From: sussex nj
help problem after changing knock senser
just changed my knock sener put in a lt4 in my lt1 94 i was told that its better and it came standered in the 96s anyway also put in a 160 stat and i started my car and the fans came on right away and i got a service engine light soon tried to dissconnect the battery and reset it it comes right back on any help :crazy:
Safety Car
Joined: Aug 2002
Posts: 3,842
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From: SANTA CRUZ CA
Re: help problem after changing knock senser (fiberglasscoffin)
As you know, the "engine light" means that a trouble code has been set. It will help to find out what code(s) is/are set.
This link may help: http://www.c4vettes.com/indepth_launch.htm
[Modified by Oldman, 12:52 PM 5/17/2003]
This link may help: http://www.c4vettes.com/indepth_launch.htm
[Modified by Oldman, 12:52 PM 5/17/2003]
Race Director
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From: O'Fallon Missouri
Re: help problem after changing knock senser (fiberglasscoffin)
Did you change your knock sensors, the LT1/4 have 2, or are you talking about a LT4 knock module?
[Modified by STL94LT1, 4:19 PM 5/17/2003]
[Modified by STL94LT1, 4:19 PM 5/17/2003]
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From: O'Fallon Missouri
Re: help problem after changing knock senser (fiberglasscoffin)
There are 2 knock sensors on these cars, one on each side of the block. I could be wrong, but I don't think the 96 knock sensors will work on the 94's, 94 was OBD1, and 96 was OBD2.
Le Mans Master
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From: Sachse Texas
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Re: help problem after changing knock senser (STL94LT1)
The knock sensors that go into the block are all the same. The only thing that is different is the knock module that plugs into the bottom of the ECM.
Looks like you have a short somewhere, maybe you knocked something loose when putting the new knock sensors in.
Looks like you have a short somewhere, maybe you knocked something loose when putting the new knock sensors in.
Thread Starter
Drifting
Joined: Mar 2003
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From: sussex nj
Re: help problem after changing knock senser (Vette92)
1st ok so there are 2 on my 94 lt1 engine 1 on both sides?
2nd is there any difference from a 94 lt1 knock sensor to a 96 lt1 or a lt4?
3rd if there isnt a difference why do i always here people saying they put in lt4 knock sensers into there lt1? thanx for the help :confused:
2nd is there any difference from a 94 lt1 knock sensor to a 96 lt1 or a lt4?
3rd if there isnt a difference why do i always here people saying they put in lt4 knock sensers into there lt1? thanx for the help :confused:
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Race Director
Joined: Jan 2002
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From: O'Fallon Missouri
Re: help problem after changing knock senser (fiberglasscoffin)
3rd if there isnt a difference why do i always here people saying they put in lt4 knock sensers into there lt1?
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From: Sachse Texas
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Re: help problem after changing knock senser (fiberglasscoffin)
See my post above...;) but just to reitterate...
1...yes.
2...no
3...they put in an LT4 knock module, not knock sensors.
1...yes.
2...no
3...they put in an LT4 knock module, not knock sensors.
Thread Starter
Drifting
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From: sussex nj
Re: help problem after changing knock senser (Vette92)
thanx for all the help thats why i come here sorry for asking 2 or 3 times like to make sure im reading it right so i should get a new knock module for a lt4 and just to play it safe replace both of my knock sensers 1 last ?? what year or does it matter lt4 knock module do i ask for for my 94 lt1 :confused:
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From: Sachse Texas
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Re: help problem after changing knock senser (fiberglasscoffin)
You will only benefit from the LT4 knock module if you are getting false knock readings from installing items such as roller rockers. It will not be worth putting one in otherwise as you will see no benefit.
The only purpose of it is to keep full timing when there is no true knock but the computer may see something that it analyzes to be knock.
The only way to tell is to get it on a scanner to see if any timing is being pulled at WOT (wide open throttle).
Chris
The only purpose of it is to keep full timing when there is no true knock but the computer may see something that it analyzes to be knock.
The only way to tell is to get it on a scanner to see if any timing is being pulled at WOT (wide open throttle).
Chris
Thread Starter
Drifting
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From: sussex nj
Re: help problem after changing knock senser (Vette92)
i was running 13.5 @ 105 and i went to level ten and bought a stall converter and a new performance trans he told me i would see atleast a .5 increase at the track so when i went i ran a best of a 13.7 @ 100 and that was the best then the trans broke and i brought it back and he rebuilt it and i told him of my numbers and he told me my knock mod or senser was bad so i dont no how he got this but thats what i am going with for now because i lost top speed and time so this is what i was told to do i just got them confused i guess
Le Mans Master
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From: Sachse Texas
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Re: help problem after changing knock senser (fiberglasscoffin)
I would suspect the broken trans being the reason for the high ET unless you have scan results to say otherwise. It can get expensive to just throw parts at it based on guessing. I know as I have done my fair share of it.
Thread Starter
Drifting
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From: sussex nj
Re: help problem after changing knock senser (Vette92)
i ran the car already with the trans redone to see if there was any difference i still went and pulled a 13.7@ 100 and a 13.7 @101 and a 13.7@ 99 and then it went to 13.8 to 13.9 @ 99 so i have to try the knock modual before going back to him
Le Mans Master
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From: Sachse Texas
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Re: help problem after changing knock senser (fiberglasscoffin)
I think you can simply unplug the knock sensors and it will keep from retarding the timing.
What else did you do between running the fast time and the slow times other than the transmission?
What else did you do between running the fast time and the slow times other than the transmission?
Thread Starter
Drifting
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From: sussex nj
Re: help problem after changing knock senser (Vette92)
noting but the trans and converter same tempeture days same temp car nothing change what is even harder to figure is all my times before the trans and converter everyone was 60foot 2.0s over 103 104 105 13.5 13.6 now my 60 foots are 1.9s so converter is working but lost mph 99 100 even a 97
Le Mans Master
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From: Sachse Texas
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Re: help problem after changing knock senser (fiberglasscoffin)
It makes sense you might loose some MPH because you are hooking better (better 60') but since you are loosing time as well I would say it is something in the convertor or the tranny. What brand of convertor is it? I know some way out-perform others.
Thread Starter
Drifting
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From: sussex nj
Re: help problem after changing knock senser (Vette92)
everything is level ten they did the job converter http://www.levelten.com/store/gm/ite..._converter.htm
trans http://www.levelten.com/store/gm/ite...7000_trans.htm
[Modified by fiberglasscoffin, 9:16 PM 5/17/2003]
[Modified by fiberglasscoffin, 9:17 PM 5/17/2003]
[Modified by fiberglasscoffin, 9:19 PM 5/17/2003]
trans http://www.levelten.com/store/gm/ite...7000_trans.htm
[Modified by fiberglasscoffin, 9:16 PM 5/17/2003]
[Modified by fiberglasscoffin, 9:17 PM 5/17/2003]
[Modified by fiberglasscoffin, 9:19 PM 5/17/2003]
Thread Starter
Drifting
Joined: Mar 2003
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From: sussex nj
Re: help problem after changing knock senser (Vette92)
i pulled the wires off the sensers and it still is retarding i have a snap on scan tool hooked up at 650 rpms just siting still 0 degree knock retard soon as i give gas or go for a ride it starts retarding 5 7 10 14 17 degrees of retard when im full into i get as high as a 21 or 20 i also get knock yes 2 or 3 times with them plugged in on wot but unpluged it says no knock but exact same retarding going on so if you pull the wires it still works dont no how any more help on this matter anyone????????? :confused: :confused: :confused: :cry :cry
[Modified by fiberglasscoffin, 12:07 PM 5/18/2003]
[Modified by fiberglasscoffin, 12:07 PM 5/18/2003]