code 16 & 43 help please.. 92lt1
Thread Starter
Racer
Joined: Jul 2004
Posts: 279
Likes: 0
From: Jonesboro AR
code 16 & 43 help please.. 92lt1
ok well i have posted on here a few times about my recent problem with running rich. it happened when i got an exaust leak. i got the leak fixed and it still ran rich. actually it wont even stay running most the time if the rpms are low. well i went to autozone and there were like 3 diff possible reasons for the code 43. one of which being bad o2 sensor in left exaust- makes since i had left exaust leak.
so i replaced the o2 sensor today and disconnected the batery to reset the computer. started it and got check engine light. i tested the code by using a paperclip. and got code 12, 16 , 43. i know code 12 is a start code.
code 16 shows to be the opti or low pulse something. i have never had a problem with the opti and this is weird b/c it wasnt there a few days ago and i havent driven it at all.
code 43 could also be the throttle adjustment screw ( says the guy at autozone).
any ideas guys?
so i replaced the o2 sensor today and disconnected the batery to reset the computer. started it and got check engine light. i tested the code by using a paperclip. and got code 12, 16 , 43. i know code 12 is a start code.
code 16 shows to be the opti or low pulse something. i have never had a problem with the opti and this is weird b/c it wasnt there a few days ago and i havent driven it at all.
code 43 could also be the throttle adjustment screw ( says the guy at autozone).
any ideas guys?
Team Owner
Joined: Aug 2000
Posts: 40,156
Likes: 45
From: San Pedro CA
43 = knock sensor. but it isn't that simple... ESC is controlled via the ECU... if I remember rightly.
I am more concerned about the code 16.
That is an indicator that the optispark is failing. Low Resolution pulse. That means the fuel timing portion of the optical side is having issue.
Clear the code and see if it comes back. If not, good, if so, you need a new optispark.
Mine appeared, cleared it, came back a month later, cleared... you get the picture.
The guy at Autozone has no clue for diagnostics and he should keep his trap shut. Just give you the codes and let you research them.
I am more concerned about the code 16.
That is an indicator that the optispark is failing. Low Resolution pulse. That means the fuel timing portion of the optical side is having issue.
Clear the code and see if it comes back. If not, good, if so, you need a new optispark.
Mine appeared, cleared it, came back a month later, cleared... you get the picture.
The guy at Autozone has no clue for diagnostics and he should keep his trap shut. Just give you the codes and let you research them.
Team Owner
Joined: Sep 2003
Posts: 25,295
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From: I'm the walkin dude I can see all of the world...
St. Jude Donor '03
Originally Posted by reed62783
what do you mean clear the code? how do i do that?
Last edited by VR'92; Dec 3, 2004 at 02:43 PM.
Melting Slicks
Joined: Jun 2004
Posts: 3,032
Likes: 4
It did work: if you cleared the code, and it came back... that means you still have the problem...
Do a search for my name and look for my Knock Sensor (code 43) thread...
I had a lot of help from some knowledgable people on here...
There is a step by step logic in that thread of how to troubleshoot a code 43.
Do a search for my name and look for my Knock Sensor (code 43) thread...
I had a lot of help from some knowledgable people on here...
There is a step by step logic in that thread of how to troubleshoot a code 43.
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Thread Starter
Racer
Joined: Jul 2004
Posts: 279
Likes: 0
From: Jonesboro AR
wow i think i might have thought of something-
ok the code 43 is a knock sensor. The day i got my car in the shop for the exaust leak i ran outa gas and had someone rbing me some. i put about 5 gallons into it. this gas was 87 octane. Is it possible that using 87 octane gas could cause the code to trip and cause the car to run like crap?
i am going to the gas station and getting some 93oct tomorrow along with some octane booster to try it.
ok the code 43 is a knock sensor. The day i got my car in the shop for the exaust leak i ran outa gas and had someone rbing me some. i put about 5 gallons into it. this gas was 87 octane. Is it possible that using 87 octane gas could cause the code to trip and cause the car to run like crap?
i am going to the gas station and getting some 93oct tomorrow along with some octane booster to try it.
Team Owner
Joined: Aug 2000
Posts: 40,156
Likes: 45
From: San Pedro CA
the cheap gas could cause that, I guess, but if it does, that means the knocksensor is bad.
think about, the knocksensor is designed to retard timing if the gas isn't hot enough. you put in the wrong gas, it knocks, the sensor can't deal with actually working, then you get a code.
As I stated earlier, your concern should be the 16, the low res code from the Opti. I have seen code 16s and 43s going together. If a code 36 pops, then you are uber screwed, new opti is needed.
think about, the knocksensor is designed to retard timing if the gas isn't hot enough. you put in the wrong gas, it knocks, the sensor can't deal with actually working, then you get a code.
As I stated earlier, your concern should be the 16, the low res code from the Opti. I have seen code 16s and 43s going together. If a code 36 pops, then you are uber screwed, new opti is needed.
Thread Starter
Racer
Joined: Jul 2004
Posts: 279
Likes: 0
From: Jonesboro AR
ok i put some new gas in the car and some octane booster. i then reset the computer and the code 16 disappeared. leaving only the code 43. i found out that code 43 is deffinatly the knock sensor.
my question now is how long will it take for the new gas to only be in the system. the car was on reserve when i did this.
is it possible for their just to be a bad knock sensor, or does the signal mean something is wrong internally?
thx
my question now is how long will it take for the new gas to only be in the system. the car was on reserve when i did this.
is it possible for their just to be a bad knock sensor, or does the signal mean something is wrong internally?
thx
Melting Slicks
Joined: Jun 2004
Posts: 3,032
Likes: 4
code 43 isn't saying the knock sensor is detecting knock...
code 43 is saying your ESC and ECM are not getting any respose from the knock sensor...
If you use poor gas, and it causes detonation (knock) the knock sensor/ESC will retard timing, that's how it does its' job
code 43 is saying your ESC and ECM are not getting any respose from the knock sensor...
If you use poor gas, and it causes detonation (knock) the knock sensor/ESC will retard timing, that's how it does its' job
Team Owner
Joined: Aug 2000
Posts: 40,156
Likes: 45
From: San Pedro CA
that's what it looks like.
you needed to clear codes, put in the better gas to confirm, but that's the need...
installing them is a pain. the knock sensors are the block drains for engine coolant.
you needed to clear codes, put in the better gas to confirm, but that's the need...
installing them is a pain. the knock sensors are the block drains for engine coolant.
Melting Slicks
Joined: Jun 2004
Posts: 3,032
Likes: 4
Originally Posted by reed62783
so mikey are you saying i just need to buy a new knock sensor?
If I understand the system right, it's either the knock sensor or the electrical connector to it (avaiable from any GM dealer)...
In my case, I replaced both at the same time, and it fixed my code... So I dont know which fixed it...
