i was just wondering if anyone knows what sensor is on the passenger side of the block that has a wire from the starter to the block? the reason i am asking is because last time i was messing with the starter i broke the connector off and now it isnt hooked up. its been broken for a while now with no problems but i would like to fix it since it is probably there for a reason. i wouldnt even know what to ask for at the parts store since i dont know what its called. looks like a plastic clip with a metal spike that plugs into the block. any input would be appreciated. if i get a chance i will snap a pic of it.
CK5
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wire from starter to block sensor?
- Thread starter isaac
- Start date
lectric80
3/4 ton status
Which terminal does it connect to on the starter solenoid? I am not aware of any wires that run direct to the block, unless it is a ground.
i will check it out later today i am not too sure where its connected at on the starter but now that you say it dose make sense it could be a ground.
lectric80
3/4 ton status
When you look at it grab a pic and we will be able to tell for certain, but it certainly sounds like some grounds that I have seen. I have never seen a wire go from the starter to the block for anything else, especially a sensor. It most likely is a ground, and shouldn't be required since the starter is already directly grounded to the block.
There is a round sensor just ahead of the starter on the block, but the wire only runs near the starter wires - it is not wired to the starter. Dunno what is is though. 
Knock sensor that is threaded into the water jacket of the block. Help us out here and inform us of the exact year and engine size so that we can be sure. I see an 87 in your sig but is that what we are talking about?
You can probably get a new connector at Napa or the like, assuming we are correct at guessing knock sensor.
Personally I won't pay the price for the connectors with pigtails, GM used the same knock sensor connector for at probably 20 years (1981-2000?) on just about every vehicle they made, so finding low mileage vehicles in the wrecking yard for donors is easy.
Personally I won't pay the price for the connectors with pigtails, GM used the same knock sensor connector for at probably 20 years (1981-2000?) on just about every vehicle they made, so finding low mileage vehicles in the wrecking yard for donors is easy.
knock sensor. Wire should go to the ESC module.
Yep, that is your knock sensor and the wire does not connect to your starter, at least it's not supposed to but who knows what other people (PO) do to their vehicles. That wire should go up through the starter wire shield though along with all the starter wires and then up into the harness to the ECM.
Should throw a check engine light, can't recall what kind of mode (limp, etc) that would put the engine in.
If you aren't getting a check engine light, does your light work when you turn the key on?
If you aren't getting a check engine light, does your light work when you turn the key on?
The knock sensor not being hooked up should not pull a code. The only thing that will happen is the ECM will not be able to adjust timing based on knock. FWIW in the past i've forgotten to hook mine up and it did not throw a code.
You aren't really going to make me dig out the truck service manuals are you?
http://www.thirdgen.org/techboard/p...0876-need-know-where-knock/1834062-post5.html
Third paragraph.
I really don't know if the trucks do the same thing, but would seem odd not to, since they use the same ECM. I will be more than happy to check though when I get home.
Understand that the knock sensor serves to save the engine only when knock is detected by reducing the "hard coded" timing in the PROM. Just clarifying for the OP.
Dorian, do me a favor and pull your knock sensor wire and see if you get either a code or a SES light. When i forgot to plug mine in i got neither. 
bp71k5
3/4 ton status
x2, mine didn't throw a code either which kinda surprised me.
I've got TPI and a different ECM, unfortunately for me that's too far distant, especially considering how VSS makes such a difference between TBI and TPI.
I'm going to go pull the manual, will post up tomorrow on code 43. I'll forget this, better do it now.
"The ECM continually monitors voltage on CKT485 terminal "B7" if a knock signal (low voltage) is detected but for less than 5 seconds the ESC system is considered operational and Code 43 will not set. If, however, low voltage is detected for more than 5 seconds or signal voltage remains high, a functional check will be performed. To perform this, the ECM will advance the spark timing when coolant temperature is above 95*C and the engine is under heavy load (near WOT). The ECM then checks the signal at "B7" to see if a knock is detected. If no knock is detected, the "Service Engine Soon" light will remain "ON" until the ignition is turned "OFF" or until a knock signal is detected. The functional check will only be performed once per start up."
I'm going to go pull the manual, will post up tomorrow on code 43. I'll forget this, better do it now.
"The ECM continually monitors voltage on CKT485 terminal "B7" if a knock signal (low voltage) is detected but for less than 5 seconds the ESC system is considered operational and Code 43 will not set. If, however, low voltage is detected for more than 5 seconds or signal voltage remains high, a functional check will be performed. To perform this, the ECM will advance the spark timing when coolant temperature is above 95*C and the engine is under heavy load (near WOT). The ECM then checks the signal at "B7" to see if a knock is detected. If no knock is detected, the "Service Engine Soon" light will remain "ON" until the ignition is turned "OFF" or until a knock signal is detected. The functional check will only be performed once per start up."
well i guess i better go get a new connector from napa today just to be safe and so i dont see any service engine soon light. think its only like 12bucks or so. thanks for all the info guys i guess u dont know untill you ask right....
It's odd you guys aren't getting a light with the knock disconnected though...there doesn't seem to be any way "around" getting the check engine if you go WOT if it's disconnected.
