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LT1-LT4 Modifications 1993-97 Gen II Small Block V8

Knock sensor problems and lacking performance lt1

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Old Aug 10, 2013 | 06:30 PM
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Default Knock sensor problems and lacking performance lt1
So while showing my car off to my cousins, you know riding it real hard, I noticed that it had good power from a stand still or roll but was taking what I feel was around 8 seconds to hit 60. And thats slow for a stock lt1 which mine is not. Around this time my check engine light came on. I drove cautiously the rest of the way home checked the code and found it is the 43 knock sensor code. After checking the sensor and wiring I replaced the knock sensor. The wiring had 4.9v whith key on. The old sensor read 3.2 mega ohms. After replacing the sensor it seemed to perform better but still not as good as I hoped it would (keep in mind im pretty sure it hasnt ran like it should since i got it so its hard to establish a baseline performance). Then the other day the code pops back up. Im not sure whats wrong. Any suggestions would be great since a ticket limits me from taking it to a shop.
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Old Aug 10, 2013 | 07:46 PM
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While the code 43 is present your timing is backed up. That does kill performance.
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Old Aug 10, 2013 | 08:23 PM
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Yea I figured that but I have good voltage on the wire and I tested the new sensor before I put it in and it tested good. So I dont know why im still getting the code.
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Old Aug 10, 2013 | 08:31 PM
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Originally Posted by LukeSMaroonMachine
Yea I figured that but I have good voltage on the wire and I tested the new sensor before I put it in and it tested good. So I dont know why im still getting the code.
It's obviously failing the test at startup. Do you ever see knock retard on the scan tool?
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Old Aug 10, 2013 | 10:30 PM
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Can that be checked on obd1 because my car is a 94 lt1. I know my tool cant do anything but give me codes.
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Old Aug 11, 2013 | 12:46 AM
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Did you torque the new sensor to spec or just throw it in and go until tight? Those knock sensors are sensitive to being overtight, and if you overtighten it, it should be replaced again.
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Old Aug 11, 2013 | 03:37 AM
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Disconnect the knock sensor and see if the code continues.

It could be something knocking in the engine that is setting off the sensor.
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Old Aug 11, 2013 | 07:50 AM
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Originally Posted by LukeSMaroonMachine
Can that be checked on obd1 because my car is a 94 lt1. I know my tool cant do anything but give me codes.
Of course all that can be checked on OBD1 systems. Evidently you only have a code reader, not a scanner.

Unplugging the knock sensor like another guy suggested will still set the code 43, and have the same effect.
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Old Aug 11, 2013 | 12:24 PM
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I did not torque it to any spec because I could not find spec for it in my manual. What it the spec for it?

Are those scanners expensive?
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Old Aug 11, 2013 | 01:43 PM
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If you have a laptop with usb ports you can get the software for free. you will need a adl cable but they are cheap. It is hard to find an inexpensive obd1 scanner with live data. Could try ebay?
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Old Aug 11, 2013 | 03:08 PM
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Ok cool whats a good software to get?
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Old Aug 11, 2013 | 03:26 PM
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Originally Posted by LukeSMaroonMachine
Ok cool whats a good software to get?
The best is Datamaster from TTS.
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Old Aug 11, 2013 | 10:01 PM
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Is the torque spec for that listed in the Haynes manual? If so where because i could not find out when i looked
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Old Aug 13, 2013 | 09:02 AM
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The torque spec is 14 lb ft. Also make sure you have some teflon thread sealer tape on there
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Old Aug 13, 2013 | 11:02 AM
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Well im sure I got it tighter then that so I gues I will have to get a new one. Now I know better.
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Old Aug 13, 2013 | 02:23 PM
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Originally Posted by LukeSMaroonMachine
Well im sure I got it tighter then that so I gues I will have to get a new one. Now I know better.
just losen it and TQ to spec
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Old Aug 13, 2013 | 02:26 PM
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Originally Posted by ******
just losen it and TQ to spec
What he ^^ said.

If your tuner zeroed out the retard vs KPA table, it will do the same thing.
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Old Aug 13, 2013 | 02:29 PM
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You can try removing it and putting it back in, but when I went through the same ordeal a loooong time ago mine had to be replaced. Just sayin
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Old Aug 14, 2013 | 09:32 PM
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Yea I got a new one under warranty just have to put it in.
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