where does this plug go?
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Joined: Mar 2007
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From: Atlanta Ga
where does this plug go?
I have a plug that i dont know where it goes. It is coming out of the harness on the drivers side. Its the same harness that has all the ground connections in it. It looks like the plug for the knock sensor, but i know that goes on the other side. (just a rference as to what it looks like). Does anyone know what this is and where it might go? The exhaust i bought from summit has a bung welded in the pipe right at the manifold/pipe connection. It looks like it is for an O2 sensor, but someone told me i don't have 02's cuz its speed density and not mass air! I'm a little lost!!
Safety Car
Joined: Sep 2003
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From: Orange County NY
St. Jude Donor '10-'11-'12-'13
Stop listening to the person that said you don't have O2 sensor(s) because it is speed density!! 
You most certainly DO (or should) have an O2 sensor on that side (though I forget which year started running two).
This is a great book if you'd like to learn about how the fuel management system works:
http://www.amazon.com/Corvette-Injec...7953555&sr=1-1
You most certainly DO (or should) have an O2 sensor on that side (though I forget which year started running two).
This is a great book if you'd like to learn about how the fuel management system works:
http://www.amazon.com/Corvette-Injec...7953555&sr=1-1
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From: Valencia PA
All Corvettes frome AT LEAST 1985 have O2 sensors, some have multiple. The speed density system does not have a Mass air flow sensor to calculate the amount of incoming air. What year and /or motor is in your car?
Le Mans Master
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From: One day you're a Comet...the next day you're dust... Arkansas
I have a plug that i dont know where it goes. It is coming out of the harness on the drivers side. Its the same harness that has all the ground connections in it. It looks like the plug for the knock sensor, but i know that goes on the other side. (just a rference as to what it looks like). Does anyone know what this is and where it might go? The exhaust i bought from summit has a bung welded in the pipe right at the manifold/pipe connection. It looks like it is for an O2 sensor, but someone told me i don't have 02's cuz its speed density and not mass air! I'm a little lost!!
Le Mans Master
Joined: Jun 2001
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From: Less Talk, More WOT | Houston TX
Badduck is correct. The plug that is identical to the knock sensor on the drivers side harness goes to the coolant temp sensor that controls the boost fan in between cylinders 1 and 3. 
Le Mans Master
Joined: Jun 2001
Posts: 6,694
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From: Less Talk, More WOT | Houston TX
Your 02 sensor will be threaded into your drivers side front y pipe if your car is stock. Follow the wire from it to the connector, and to the harness from there, it should be easy to spot.
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Race Director
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From: The Top of Utah
Originally Posted by Wheelman
Badduck is correct. The plug that is identical to the knock sensor on the drivers side harness goes to the coolant temp sensor that controls the boost fan in between cylinders 1 and 3.
RACE ON!!!
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From: Atlanta Ga
sorry, it is a 1990 convertible. I don't know how it would go to another knock sensor! It doesn't plug into a knock sensor. It has one contact. I'm gonna take a picture and post it!
Thanks
Thanks
Le Mans Master
Joined: Jun 2001
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From: Less Talk, More WOT | Houston TX
Not if it is a speed density car, he isn't. Why won't people post a year with their problems/questions? The speed density 1984 and the MAF 1985, have the fan switch on the right side of the car, in the head, between the #6 and #8 spark plugs. The 1986 - 1989 cars have the switch where Badduck says, but they are MAF cars. The 1990 went back to speed density, but the ECM took over the management of the auxiliary fan, and consequently no fan switch. I can only guess this is an early '90s car with a speed density system, no aux fan switch, but two knock sensors, and that the mystery connection goes to the left side knock sensor. Maybe???
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From: Atlanta Ga
i don't see where the second knock sensor goes?? the corresponding hole that the knock sensor goes in on the passenger side has a hose barb for the oil cooler coming out of it!! Where might this sensor go?
Does the O2 sensor have a 1 contact plug just like the knock sensor?
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From: Atlanta Ga
Race Director
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From: The Top of Utah
Originally Posted by daniel0213
sorry, it is a 1990 convertible. I don't know how it would go to another knock sensor! It doesn't plug into a knock sensor. It has one contact. I'm gonna take a picture and post it!
Thanks
Thanks
Originally Posted by Wheelman
I assumed it was not an 84 / 85 from the picture. 90 and up has two knock sensors? I learn something new here every day....
The knock sensors install into the block drain plug holes.
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Racer
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If it is the same harness that has all of the grounds, my money would be on it being the oil temp. sender lead and plug. This plugs in just above the oil filter onto a brass blade, and is not easy visible.
To my knowledge ALL L98s have one knock sensor, above the starter.
The drain plug location on the other side of the block is where the oil cooler hose goes.
To my knowledge ALL L98s have one knock sensor, above the starter.
The drain plug location on the other side of the block is where the oil cooler hose goes.
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Joined: Mar 2007
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From: Atlanta Ga
In your opening post, you said, "It looks like the plug for the knock sensor, but i know that goes on the other side. (just a rference as to what it looks like).". Are you now telling us that isn't true? What gives???
I honestly don't know what year they went to two knock sensors. Mostly, I was trying to play Sherlock Holmes with the lack of information provided. Now it appears even the little we were give, is in doubt. It makes one wonder...
The knock sensors install into the block drain plug holes.
RACE ON!!!
I honestly don't know what year they went to two knock sensors. Mostly, I was trying to play Sherlock Holmes with the lack of information provided. Now it appears even the little we were give, is in doubt. It makes one wonder...
The knock sensors install into the block drain plug holes.
RACE ON!!!
It looks like the same plug as the knock sensor, but the contact is to small to plug into it! I doubt its the oil temp plug, as my guages are reading oil temp. I really think it goes into the 02, but i'm not sure. there is nothing else there! Was there ever a year where the o2 had a 1 contact plug?
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From: The Top of Utah
If the car goes into closed loop, then the O2, where ever it may be, is hooked up and working.
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Originally Posted by daniel0213
It looks like it is for an O2 sensor, but someone told me i don't have 02's cuz its speed density and not mass air! I'm a little lost!!
I need to go buy one!! How dangerous is it to run the car without?
Safety Car
Joined: Sep 2003
Posts: 3,599
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From: Orange County NY
St. Jude Donor '10-'11-'12-'13
This is a great book if you'd like to learn about how the fuel management system works:
http://www.amazon.com/Corvette-Injec...7953555&sr=1-1
http://www.amazon.com/Corvette-Injec...7953555&sr=1-1