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Username Post: code 43 knock sensor        (Topic#191951)
bigguy 
Forum Newbie
Posts: 31

Reg: 02-09-08
06-14-08 07:38 PM - Post#1455847    

Ok, heres the deal , i have a 94 gmc truck it had the 4l60e and a 5.7 litre engine, i pulled the motor and installed a new rebuilt 5.7 litre and while i was at it i pulled the auto tranny and installed an nv4500 manual. I also changed the prom to one for a manual transmission it seems to run ok but not the best im getting a code 43 Electronic spark control not recieving a knock signal, i went and bought another knock sensor for a manual to see if it would fix it but its still there code 43 after erasing the codes.

the haynes manual states that a 88- 95 should have a resistance of 1.5k to 10k on the knock sensor, and 90k - 110k ohms for a 1996 - 2000. i specifically asked for 94 knock sensor and its reading 95k ohms the range for a 96-2000.

i have to set the timming at 2-4 ? degrees to get the engine to accelerate half way decently if i set it at the factory spec of 0 it wont accelerate and is doggy. I think the computer is not advancing the timing fully because of the lack of a knock signal.

any ideas before i take it to the dealer? also is the esc module part of the ecm because i cant find an external one.

thanks for any help dan.

 
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someotherguy 
Moderator
Posts: 25975
someotherguy
Age: 44
Loc: Texas
Reg: 08-01-03
06-14-08 07:52 PM - Post#1455850    
    In response to bigguy

Hey Dan,

When you changed to the chip for a manual, did you stick with the programming for the same year model and engine, and a chip appropriate for the service ID # of your computer?

Where did you get the knock sensor, and do you still have the part # for it so you can double-check the application for it?

And yes, the separate ESC module on the earlier TBI engines was incorporated into the ECM somewhere around '93 - '92 has the separate style and '94 does not, I don't know about '93. For a while I thought it had been incorporated into the ignition module inside the distributor, but someone else pointed out that the part #'s there did not change.

Richard
94 C2500LD / 97 Suburban LS1 / 06 300C SRT8
Check out my truck shop projects


 
bigguy 
Forum Newbie
Posts: 31

Reg: 02-09-08
06-14-08 08:02 PM - Post#1455857    
    In response to someotherguy

yep, im pretty sure i got the right chip i got one from the guy on ebay "harris performance " i gave him all my #s info . the knock sensor i got from oreillys part number S 8012 BWD brand .


 
someotherguy 
Moderator
Posts: 25975
someotherguy
Age: 44
Loc: Texas
Reg: 08-01-03
06-15-08 07:56 AM - Post#1456043    
    In response to bigguy

Double-checking your part #, yeah, that should be the correct one for a '94 5.7 with a standard trans - would be 8011 with an automatic. Weird. I wonder if it was mislabeled, or there's some other problem?

Richard
94 C2500LD / 97 Suburban LS1 / 06 300C SRT8
Check out my truck shop projects


 
bigguy 
Forum Newbie
Posts: 31

Reg: 02-09-08
07-11-08 04:25 PM - Post#1475736    
    In response to someotherguy

ok i still havent figured it out but after further research ive noticed that the wiring harneses for autos "mine "has a knock sensor wire that goes straight from the knock sensor to the computer where as the wiring harness for the manual shows a seperate knock sensor module, ive read somewhere that each type of knock sensor is specific to its own module. im wondering if i should use an automatic knock sensor because its compatible with the knock sensor module in the ecm. or maybe i need to hook up the manual knock sensor module and keep the manual trans knock sensor . i guess what im saying is maybe the knock sensor is specific to the module and not the tranny because the manual and auto has its own module and sensor i never changed the module just the knock sensor. sorry for any confusion.

Edited by bigguy on 07-11-08 04:27 PM. Reason for edit: No reason given.

 
someotherguy 
Moderator
Posts: 25975
someotherguy
Age: 44
Loc: Texas
Reg: 08-01-03
07-11-08 05:30 PM - Post#1475791    
    In response to bigguy

What manual are you looking in? I've never seen a knock sensor module.. it may be something I'm overlooking but who knows. I think the 4.3's have two knock sensors, but I've very little experience with them, maybe that's the setup you're looking at?

Richard
94 C2500LD / 97 Suburban LS1 / 06 300C SRT8
Check out my truck shop projects


 
bigguy 
Forum Newbie
Posts: 31

Reg: 02-09-08
07-11-08 07:25 PM - Post#1475866    
    In response to someotherguy

well its kind of confusing , i have two books 1 is a haynes and the other is a is a chiltons, i guess haynes calls it a knock sensor module and chiltons calls it a esc module. part of my problem is everyone calls the same part different names. LOL. not!!

 
someotherguy 
Moderator
Posts: 25975
someotherguy
Age: 44
Loc: Texas
Reg: 08-01-03
07-12-08 09:19 AM - Post#1476177    
    In response to bigguy

Well, the ESC module *could* be thought of as a knock sensor module but that's really not the correct thing to call it. The ESC module affects the timing advance, and the knock sensor circuit definitely has something to do with that, but the ESC module isn't specifically for the knock sensor, ya see? The knock sensor is just one of the inputs that can affect the timing.

That's where you can get into trouble sometimes with these aftermarket manuals.

The earlier TBI engines have the ESC module separate, hanging on a bracket to the passenger side of the throttle body, along with the EGR solenoid. Later ones have it built into the ECM and the bracket will still be there, just blank other than the EGR solenoid. Your '94 should be that way.

Richard
94 C2500LD / 97 Suburban LS1 / 06 300C SRT8
Check out my truck shop projects


 
bigguy 
Forum Newbie
Posts: 31

Reg: 02-09-08
07-12-08 10:44 AM - Post#1476219    
    In response to bigguy

Got it figured out , when i switched over from an auto trans to a manual trans i thought i needed a manual knock sensor too, but i actually needed to just keep the auto one because its comptible with my ecm. the 1994 autos have the esc built into the ecm like you say, but the manuals have the esc mounted seperate . same year different set ups . thats why i was reading 95. ohms but was only supposed to have like 3-5. something for my set up.

i guess the knock sensor should be stated for internal or external esc modules instead of manual or auto . but thats the way they built them from the factory so i can see why theres a little confusion. oh well atleast i got it figured out 3 knock sensors later a new computer 200.00 dollar later. i hope now i can get more than 10 miles per gallon . i could have just thrown in a 468 i got sitting around and got 10 mpg.

 
someotherguy 
Moderator
Posts: 25975
someotherguy
Age: 44
Loc: Texas
Reg: 08-01-03
07-12-08 10:50 AM - Post#1476223    
    In response to bigguy

Great! I didn't know the later ones with a standard would have the separate ESC module. That's good to know. I see so few of these trucks with a standard, and the couple of them that I have here right now are a pair of '88s so they would have had the separate ESC module no matter what. I've got a '96 here with a standard but since that's a whole different animal, OBD II, no way to compare.

Richard
94 C2500LD / 97 Suburban LS1 / 06 300C SRT8
Check out my truck shop projects


 
snuffdipper 
Forum Newbie
Posts: 1

Reg: 08-09-11
08-09-11 01:13 PM - Post#2123700    
    In response to bigguy

i cant thank you enough for posting that i baught a 95 gmc automoatic trann with a 5.7 and the motor was bad so i baught another motor for it that came out of a manual truck put it in got it running and the check engine light stayed on ran codes and said code 43 ive been reading and working on this for 2 weeks and finally seen your post yesterday so today i put a knock sensor from an automatic in it and the light is now off thank you thank you thank you your the bomb dude thanks

 
Chevytech 
Subject Matter Expert - Senior Member
Posts: 3095

Loc: Twin Cities, Minnesota, U...
Reg: 04-25-04
08-10-11 05:31 PM - Post#2124229    
    In response to bigguy

bigguy is correct.
A 1994 with an automatic has the knock sensor module built into the computer but the manual transmission trucks have a separate module outside the computer.

A 1994 automatic transmission truck has a PCM. A 1994 manual transmission truck has an ECM.

The 1994 1500(1/2 ton) pickups with an automatic transmission used the 8192 baud rate PCM that controls the shifting of the 4l60E transmission. This is a much faster computer. With a manual transmission it will have a 160 Baud rate C3 ECM that the 1992 TBI trucks had.

Take this into consideration when mixing parts between these vehicles. The parts have to match the computer you are using.

The knock sensor must match the part monitoring it.
For those of you that are wondering why you are not getting replies to your thread:

Did you give the model, year, engine, fuel system type, and transmission information?

If the it has been altered from stock let us know about that too.


 
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