Lets play, "Whats this wire!" - The 1947 - Present Chevrolet & GMC Truck Message Board Network

RandyP · 08-26-2010, 01:26 PM

Ok, trying to figure out what this might go to. Has never been hooked up since I've owned the truck. We thought at first might be like an o2 sensor wire, but it's not.

1987 R10 350 TBI 700R4
Wire is on passenger side, coils around the transmission lines and goes in to a loom that goes up the side of the block. Is blue in color. What is it? Can take more photos if needed, did the best I could real fast with it on the ground.

RandyP · 08-26-2010, 01:36 PM

After looking at my painters 88 Blazer, looks like it goes to a sensor of some sort on the right side of the block, right by the oil pan. My old motor has the sensor, says DR6998086 on it. New block does not have a hole for this sensor.

What oh what is it?

GmtGmt · 08-26-2010, 01:46 PM

Quote:

Originally Posted by RandyP

After looking at my painters 88 Blazer, looks like it goes to a sensor of some sort on the right side of the block, right by the oil pan. My old motor has the sensor, says DR6998086 on it. New block does not have a hole for this sensor.

What oh what is it?

knock sensor? Oil pressure sender?

RandyP · 08-26-2010, 01:49 PM

Oil pressure sensor is on the other side, so is the water temp sensor. I'd venture to say it goes in the block where water is, dunno. I know the thing has been unplugged for a while, and never got a CEL from it, would just really like to know exactly what it is since we have no way of hooking it up now.

*edit*

Looked up a knock sensor, I think you're right.
http://www.oreillyauto.com/site/c/de...2200&ppt=C0033

Jonboy · 08-26-2010, 02:37 PM

That is a knock sensor. There is only one, it goes to the passenger side. That wire is correct for the KS. The KS goes in the drain hole on the passenger side. The new block may have a plug instead of being open, but should be there.

RandyP · 08-26-2010, 02:48 PM

Jon is correct as well. Already have the new one installed (since we could not get the old one out). Thanks guys, as always

motornut · 08-27-2010, 06:52 AM

mine has come off too,i guess i hit it the tang is gone.....i thought i read in here something about this ajusts timing?won't advance without it?

GmtGmt · 08-27-2010, 07:17 AM

Quote:

Originally Posted by motornut

mine has come off too,i guess i hit it the tang is gone.....i thought i read in here something about this ajusts timing?won't advance without it?

correct it would adjust the timing if the engine start to knock because of fuel
like octane, leaded/unleaded it could start to knock this sensor picks it up and advances or retards the timing.

on some cars you can screw the sensor out and ground the sensor and you would get 5+ HP but you have to time the engine if you just unplug it it would run like crap but will not throw a code

Jonboy · 08-27-2010, 08:46 AM

The knock sensor picks up the sound from pinging. It sends a signal to the ESC (electric spark control) to pull timing out to stop the detonation. It will pull timing out 4 degrees, then return it 2 degrees at a time as long as there is no detonation. I don't think it will advance it over where it is set, but it will retard it as needed when detonation occurs.

motornut · 08-27-2010, 10:34 AM

thanks, random underneath shots i spotted it hangin last week,hence the "seems to run like crap lately"

82chevy350 · 08-27-2010, 12:36 PM

That looks nassssty

08-26-2010, 01:26 PM	#1
RandyP Getting Old; Going Broke Join Date: Apr 2010 Location: Owasso OK Posts: 2,764	Lets play, "Whats this wire!" Ok, trying to figure out what this might go to. Has never been hooked up since I've owned the truck. We thought at first might be like an o2 sensor wire, but it's not. 1987 R10 350 TBI 700R4 Wire is on passenger side, coils around the transmission lines and goes in to a loom that goes up the side of the block. Is blue in color. What is it? Can take more photos if needed, did the best I could real fast with it on the ground. Attached Images __________________ *Why is every used 350 sbc out of a corvette?* There's only two things that excite a man, expensive toys and real expensive toys. *VEGETARIAN: That's an old Indian word meaning "I don't hunt so good."* When the going gets tough, switch to power tools.

08-26-2010, 01:36 PM	#2
RandyP Getting Old; Going Broke Join Date: Apr 2010 Location: Owasso OK Posts: 2,764	Re: Lets play, "Whats this wire!" After looking at my painters 88 Blazer, looks like it goes to a sensor of some sort on the right side of the block, right by the oil pan. My old motor has the sensor, says DR6998086 on it. New block does not have a hole for this sensor. What oh what is it? Attached Images __________________ *Why is every used 350 sbc out of a corvette?* There's only two things that excite a man, expensive toys and real expensive toys. *VEGETARIAN: That's an old Indian word meaning "I don't hunt so good."* When the going gets tough, switch to power tools. Last edited by RandyP; 08-26-2010 at 01:40 PM.

08-26-2010, 01:49 PM	#4
RandyP Getting Old; Going Broke Join Date: Apr 2010 Location: Owasso OK Posts: 2,764	Re: Lets play, "Whats this wire!" Oil pressure sensor is on the other side, so is the water temp sensor. I'd venture to say it goes in the block where water is, dunno. I know the thing has been unplugged for a while, and never got a CEL from it, would just really like to know exactly what it is since we have no way of hooking it up now. edit Looked up a knock sensor, I think you're right. http://www.oreillyauto.com/site/c/de...2200&ppt=C0033 __________________ *Why is every used 350 sbc out of a corvette?* There's only two things that excite a man, expensive toys and real expensive toys. *VEGETARIAN: That's an old Indian word meaning "I don't hunt so good."* When the going gets tough, switch to power tools. Last edited by RandyP; 08-26-2010 at 01:51 PM.

08-26-2010, 02:37 PM	#5
Jonboy Slots go on anything! Join Date: May 2003 Location: Richardson, TX Posts: 5,957	Re: Lets play, "Whats this wire!" That is a knock sensor. There is only one, it goes to the passenger side. That wire is correct for the KS. The KS goes in the drain hole on the passenger side. The new block may have a plug instead of being open, but should be there. __________________ 1974 Jimmy- 5.3/4L80e/NP241 Last edited by Jonboy; 08-26-2010 at 02:38 PM.

08-26-2010, 02:48 PM	#6
RandyP Getting Old; Going Broke Join Date: Apr 2010 Location: Owasso OK Posts: 2,764	Re: Lets play, "Whats this wire!" Jon is correct as well. Already have the new one installed (since we could not get the old one out). Thanks guys, as always __________________ *Why is every used 350 sbc out of a corvette?* There's only two things that excite a man, expensive toys and real expensive toys. *VEGETARIAN: That's an old Indian word meaning "I don't hunt so good."* When the going gets tough, switch to power tools.

08-27-2010, 06:52 AM	#7
motornut 78K & 79C Jimmys Join Date: Nov 2009 Location: Ottawa Ont CANADA Posts: 7,901	Re: Lets play, "Whats this wire!" mine has come off too,i guess i hit it the tang is gone.....i thought i read in here something about this ajusts timing?won't advance without it? __________________ John 1978 GMCJimmy4X4-350/203 1979 GMCJimmy4X2-305/350

08-27-2010, 08:46 AM	#9
Jonboy Slots go on anything! Join Date: May 2003 Location: Richardson, TX Posts: 5,957	Re: Lets play, "Whats this wire!" The knock sensor picks up the sound from pinging. It sends a signal to the ESC (electric spark control) to pull timing out to stop the detonation. It will pull timing out 4 degrees, then return it 2 degrees at a time as long as there is no detonation. I don't think it will advance it over where it is set, but it will retard it as needed when detonation occurs. __________________ 1974 Jimmy- 5.3/4L80e/NP241

08-27-2010, 10:34 AM	#10
motornut 78K & 79C Jimmys Join Date: Nov 2009 Location: Ottawa Ont CANADA Posts: 7,901	Re: Lets play, "Whats this wire!" thanks, random underneath shots i spotted it hangin last week,hence the "seems to run like crap lately" Attached Images __________________ John 1978 GMCJimmy4X4-350/203 1979 GMCJimmy4X2-305/350 Last edited by motornut; 08-27-2010 at 10:36 AM.

08-27-2010, 12:36 PM	#11
82chevy350 Registered User Join Date: Sep 2009 Location: Van Buren, AR Posts: 321	Re: Lets play, "Whats this wire!" That looks nassssty __________________ Drive It Like Ya Stole It '82 Primer White c10 2wd LWB 350 sbc t350 (Hot Rod) '90 2wd LWB Silverado 350 tbi 700R4 (Daily Driver) '53 m38a1 Willys Jeep (Toy)

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