C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

Where is the knock sensor located?

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Old Mar 10, 2004 | 09:35 PM
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Default Where is the knock sensor located?

Hey,

Can anyone tell me where exactly the knock sensor is located on an 88C4 L98, and how it can be tested?
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Old Mar 10, 2004 | 09:41 PM
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Default Re: Where is the knock sensor located? (radhunter)

It is located on the passenger side of the engine, at the bottom between the oil pan and the exhaust pipe,,, right next to the starter :cheers:
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Old Mar 10, 2004 | 09:43 PM
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Default Re: Where is the knock sensor located? (radhunter)

I,m replying to myself just to see if my sig works now.
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Old Mar 10, 2004 | 09:50 PM
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Default Re: Where is the knock sensor located? (1990CORVETTE)

I think I see it. Looks kinda like a temp sensor doesn't it? Is there some way of checking it?
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Old Mar 10, 2004 | 10:06 PM
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Default Re: Where is the knock sensor located? (radhunter)

There is a test tool that ecklers sells, it is on page 116,,, part # 26148, $10.99
Why do you think yours is bad??????
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Old Mar 10, 2004 | 10:50 PM
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Default Re: Where is the knock sensor located? (1990CORVETTE)

My timing is whacky and I thought this might be a contributor.
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Old Mar 10, 2004 | 10:56 PM
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Default Re: Where is the knock sensor located? (radhunter)

My timing is whacky and I thought this might be a contributor.
Is it throwing any codes???
what about the SYS light is that coming on at all??????
Timing is whacky,,,how so?????????? :confused:
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Old Mar 10, 2004 | 11:06 PM
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Default Re: Where is the knock sensor located? (radhunter)

Are you using a scan tool and data collection? If so and your knock sensor is bad, you will be able to see if you're getting a bunch of knock retard even when the engine is cold. (It would either be a bad KS, or something big causing false knock.) If your timing is jumping all over the place for no reason, check the end play on your distributor gear. If there's much play there, the helical cut gear is going to raise and lower, causing the timing to fluctuate. IMO, you need to collect data or you're going to throw money at it replacing stuff you don't need to.
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Old Mar 10, 2004 | 11:09 PM
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Default Re: Where is the knock sensor located? (h rocks)

[QUOTE] If your timing is jumping all over the place for no reason, check the end play on your distributor gear. QUOTE]
:iagree:
Thats what I was thinking

By the way,,, nice Z06


[Modified by 1990CORVETTE, 10:09 PM 3/10/2004]
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Old Mar 10, 2004 | 11:22 PM
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Default Re: Where is the knock sensor located? (h rocks)

Thanks for the good advice. I've been wanting to get a scan tool just to play anyway, so I think I'll just wait until I do before I start jumping to wrong conclusions.
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Old Mar 10, 2004 | 11:41 PM
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Default Re: Where is the knock sensor located? (radhunter)

Just to clarify, by scan tool I don't mean a code reader. I'm referring to a data collection program that will allow you to capture parameters over a protracted time frame, then play it back, slice it and dice it looking for anomolies. EASE makes a very good one. (OBD2.com) Get the version that works on both OBD 1&2, then you can use it on all your computer controlled vehicles, regardless of brand.
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Old Mar 11, 2004 | 12:08 AM
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Default Re: Where is the knock sensor located? (radhunter)

You can test a knock sensor easily....

.... by one person looking at the harmonic balancer with a timing light and another person tapping on the engine block with a screwdriver handle or other non-damaging tool to simulate engine knock to the sensor. The timing should retard when the sensor hears the simulated knock.

BIG JIM
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