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Knock sensor question

GsxrMike

GsxrMike

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I decieded to install a knock sensor on my newly tbi'ed engine but when I look up the part it gives me two part number. One is for an auto and one is for a manual. They look identical so I assume the difference is the sensitivity. Does anybody know for sure and if I am right which one is less sensitive?
 
mmm, from my limited learning on GM EFI, there are two types of knock sensors: One requires a ESC (electronic spark control) module, one doesn't.

My ex's 89 'burb was an auto, had the ESC...


that's all I got...:whistle:


edit: try posting this in the Injection section also...
 
I'll try the manual version cause it was way cheaper and then chime in on if it worked. Thanks for the info!
 
GsxrMike said:
I'll try the manual version cause it was way cheaper and then chime in on if it worked. Thanks for the info!
Click to expand...


FWIW, I was thinking the manual one, cuz a manual tranny has got to be noiser than an auto...:whistle:
 
Uh, I don't know if a knock sensor is something you want to "see if it worked" on your engine. If it doesn't work, you risk damage to your pistons and rings. What are you going to do if you floor it one day, and the ECM adjusts the timing forward 10-15 degrees and you knock a hole through the top of your piston?

I would wait, ask more questions, and get a better idea of the difference.
 
Well I wasn't planning on running one at all so I think i'll be alright. Sorry if I was unclear about that in the original post.
 
when you tbi'ed the engine did you change the dizzy and control module? or did you just change the injection related items?
 
bailey9r said:
when you tbi'ed the engine did you change the dizzy and control module? or did you just change the injection related items?
Click to expand...

Yes dizzy and esc were swapped over, I didn't see anyway around it. The only code I'm getting directly after clearing the codes is a 43 esc circuit blaa blaa blaa. The other is vss low/high fault after I drive it for a bit. I wasn't planning on installing the knock sensor because I heard the plug in the block is a biotch to get out but after weighing my option I attepted to remove it and it came right out. Isn't there suppose to be coolant behind that plug? There was on my 1996 vortec 350 but on this block nothing came out. I've got it hooked up now and I'm going to set the timing tonight and try and take it for a spin to see if there is any difference in the way it runs.
 
GsxrMike said:
Yes dizzy and esc were swapped over, I didn't see anyway around it. The only code I'm getting directly after clearing the codes is a 43 esc circuit blaa blaa blaa. The other is vss low/high fault after I drive it for a bit. I wasn't planning on installing the knock sensor because I heard the plug in the block is a biotch to get out but after weighing my option I attepted to remove it and it came right out. Isn't there suppose to be coolant behind that plug? There was on my 1996 vortec 350 but on this block nothing came out. I've got it hooked up now and I'm going to set the timing tonight and try and take it for a spin to see if there is any difference in the way it runs.
Click to expand...

Yes, that hole is drilled into the water jacket and unfortunately because it is the lowest point on the water jacket it gets plugged full of crap and water usually won't come out without poking around to clear the blockage (good thing since you didn't have to wear the coolant while removing the plug).
 
Funny thing is when I changed it on my '96 I didn't know and I took a shower but this time I was expecting it and I got nothing. :)
 
i asked about the dizzy cause it is my understanding that it advances as far as can under the conditions till the knock sensor tells it to back off. I would be careful who I put there to conduct that orchestra you may not like the tune.:eek1:
 
Thanks mike, you answered my question of wth is that sensor on the bottom of the old 305, since im not putting any of the computer carb stuff back on i wont worry about putting it back in!
 
bailey9r said:
i asked about the dizzy cause it is my understanding that it advances as far as can under the conditions till the knock sensor tells it to back off. I would be careful who I put there to conduct that orchestra you may not like the tune.:eek1:
Click to expand...
This was my understanding too.
 
The esc works with the knock sensor....:whistle:
 
Ok so I installed my knock sensor and it is still giving me a code 43. I my try installing a new esc. Where is the esc, I have an old one laying around that was attached to a bracket next to the map sensor but I don't have that bracket on my current set up. Is it possible to run the tbi set up without an esc?
 
GsxrMike said:
Ok so I installed my knock sensor and it is still giving me a code 43. I my try installing a new esc. Where is the esc, I have an old one laying around that was attached to a bracket next to the map sensor but I don't have that bracket on my current set up. Is it possible to run the tbi set up without an esc?
Click to expand...


I think you can, with the right sensor...:dunno:
 
All I know is ESC = Electronic Spark Control. I would think the engine would not even work without all the components the ECM is looking for, especially spark control!
 
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