What is this plug - The 1947 - Present Chevrolet & GMC Truck Message Board Network

BowTieMan · 08-31-2005, 01:03 AM

There is a wire with a plug hanging down on my truck on the pasenger side by the back of the block and the front of the trans. It goes into a buch of taped up wires so I dont want to cut into all of it. Can any of you tell what it is? My truck is a 70 with a 350, th350, air, and has all the guages and they all work.

71-longbed · 08-31-2005, 01:50 AM

TCS(Temperature Controlled Spark)

TCS kills vacuum to the distributor vacuum advance unit unless the transmission is in high gear or when the engine is cold or starting to overheat - the pass. side sender tells the TCS system what the engine temperature is

jc · 08-31-2005, 02:30 AM

i believe it plugs into the temp sensor on the passenger side of the block .
and now i know what that sensor does because of the previous post.
thanks, always learning something.

jc · 08-31-2005, 02:34 AM

and i dont believe all trucks have em.
i melted that boot on there with a set of headers and nun of the trucks in the junk yards had the sensor or or the plug at least i couldnt find one.

71-longbed · 08-31-2005, 11:31 AM

i think 71 was the 1st year

tomatocity · 08-31-2005, 11:39 AM

Quote:

Originally Posted by 71-longbed

TCS(Temperature Controlled Spark)

TCS kills vacuum to the distributor vacuum advance unit unless the transmission is in high gear or when the engine is cold or starting to overheat - the pass. side sender tells the TCS system what the engine temperature is

Is TCS needed or will teh engine perform well without it being connected?

71-longbed · 08-31-2005, 12:04 PM

mines never been connected and i've noticed no problems

BowTieMan · 08-31-2005, 07:36 PM

So if I plug it in I will lose my vacum advance?

**pjmoreland** · 08-31-2005, 07:50 PM

Do you have a vacuum switch mounted on your intake manifold that the vacuum advance hose runs through on its way from the carburetor to the distributor? If not, I don't think the connector will affect your vacuum advance.

BowTieMan · 08-31-2005, 11:36 PM

Yes I do have a switch. It has the vacume line go into the front, one go out to the back of the carb, and another go the the vacum advance on the distributor. And it had a red and black wire going to it. So should I plug it in (where exactly) or just take all that off and run a straight hose to my advance?

3 on the tree · 09-01-2005, 09:17 AM

My 70 6 cylinder has the same thing. The solenoid is mounted on top of the intake in front of the carb. I just left it in place, and routed the vac line around it.

71-longbed · 09-01-2005, 07:30 PM

the solenoid is only held on by 1 screw .... then lift up on it and it should slide off once you reach the keyway

BowTieMan · 09-01-2005, 09:08 PM

Ya I ran a vacum line straight to it and by-passed it and it runs so much better. And accelerates quicker and smoother.

08-31-2005, 01:03 AM	#1
BowTieMan Registered User Join Date: Dec 2003 Location: Glendale Arizona Posts: 747	What is this plug There is a wire with a plug hanging down on my truck on the pasenger side by the back of the block and the front of the trans. It goes into a buch of taped up wires so I dont want to cut into all of it. Can any of you tell what it is? My truck is a 70 with a 350, th350, air, and has all the guages and they all work. Attached Images __________________ "A true hotrodder wouldn't be content untill he had created a car so violent, so hairy, so totally sick that the very act of dropping the hammer would result in instant death. Anything less results in the need to go faster." - Tony DeFeo

08-31-2005, 01:50 AM	#2
71-longbed Its Magically Delicious Join Date: Jan 2003 Location: oregon Posts: 2,398	TCS(Temperature Controlled Spark) TCS kills vacuum to the distributor vacuum advance unit unless the transmission is in high gear or when the engine is cold or starting to overheat - the pass. side sender tells the TCS system what the engine temperature is __________________ 71 C10 LWB 350sbc -TH350 12 bolt 3.42 Posi Of all my favorite things to do, The utmost is to have a brew. My love grows for my foamy friend, with each thirst-quenching elbow bend. Beer so frosty, smooth, and cold it's paradise pure liquid gold. Yes beer means many things to me that's all for now cus I gotta pee.

08-31-2005, 02:30 AM	#3
jc Registered User Join Date: Jan 2001 Location: Jackson, New Jersey Posts: 1,560	i believe it plugs into the temp sensor on the passenger side of the block . and now i know what that sensor does because of the previous post. thanks, always learning something. __________________ 2004 Silverado 2500HD Crewcab 4x4 2000 TOYOTA 4RUNNER 1971 CHEYENNE LWB (THE LOVE SHACK) 1967 c-10 lwb (THE FARMERS DAUGHTER)

08-31-2005, 02:34 AM	#4
jc Registered User Join Date: Jan 2001 Location: Jackson, New Jersey Posts: 1,560	and i dont believe all trucks have em. i melted that boot on there with a set of headers and nun of the trucks in the junk yards had the sensor or or the plug at least i couldnt find one. __________________ 2004 Silverado 2500HD Crewcab 4x4 2000 TOYOTA 4RUNNER 1971 CHEYENNE LWB (THE LOVE SHACK) 1967 c-10 lwb (THE FARMERS DAUGHTER)

08-31-2005, 11:31 AM	#5
71-longbed Its Magically Delicious Join Date: Jan 2003 Location: oregon Posts: 2,398	i think 71 was the 1st year __________________ 71 C10 LWB 350sbc -TH350 12 bolt 3.42 Posi Of all my favorite things to do, The utmost is to have a brew. My love grows for my foamy friend, with each thirst-quenching elbow bend. Beer so frosty, smooth, and cold it's paradise pure liquid gold. Yes beer means many things to me that's all for now cus I gotta pee.

08-31-2005, 12:04 PM	#7
71-longbed Its Magically Delicious Join Date: Jan 2003 Location: oregon Posts: 2,398	mines never been connected and i've noticed no problems __________________ 71 C10 LWB 350sbc -TH350 12 bolt 3.42 Posi Of all my favorite things to do, The utmost is to have a brew. My love grows for my foamy friend, with each thirst-quenching elbow bend. Beer so frosty, smooth, and cold it's paradise pure liquid gold. Yes beer means many things to me that's all for now cus I gotta pee.

08-31-2005, 07:36 PM	#8
BowTieMan Registered User Join Date: Dec 2003 Location: Glendale Arizona Posts: 747	So if I plug it in I will lose my vacum advance? __________________ "A true hotrodder wouldn't be content untill he had created a car so violent, so hairy, so totally sick that the very act of dropping the hammer would result in instant death. Anything less results in the need to go faster." - Tony DeFeo

08-31-2005, 07:50 PM	#9
pjmoreland Senior Member Join Date: Jan 2005 Location: CA Posts: 5,457	Do you have a vacuum switch mounted on your intake manifold that the vacuum advance hose runs through on its way from the carburetor to the distributor? If not, I don't think the connector will affect your vacuum advance.

08-31-2005, 11:36 PM	#10
BowTieMan Registered User Join Date: Dec 2003 Location: Glendale Arizona Posts: 747	Yes I do have a switch. It has the vacume line go into the front, one go out to the back of the carb, and another go the the vacum advance on the distributor. And it had a red and black wire going to it. So should I plug it in (where exactly) or just take all that off and run a straight hose to my advance? __________________ "A true hotrodder wouldn't be content untill he had created a car so violent, so hairy, so totally sick that the very act of dropping the hammer would result in instant death. Anything less results in the need to go faster." - Tony DeFeo

09-01-2005, 09:17 AM	#11
3 on the tree Registered User Join Date: Oct 2004 Posts: 393	My 70 6 cylinder has the same thing. The solenoid is mounted on top of the intake in front of the carb. I just left it in place, and routed the vac line around it.

09-01-2005, 07:30 PM	#12
71-longbed Its Magically Delicious Join Date: Jan 2003 Location: oregon Posts: 2,398	the solenoid is only held on by 1 screw .... then lift up on it and it should slide off once you reach the keyway __________________ 71 C10 LWB 350sbc -TH350 12 bolt 3.42 Posi Of all my favorite things to do, The utmost is to have a brew. My love grows for my foamy friend, with each thirst-quenching elbow bend. Beer so frosty, smooth, and cold it's paradise pure liquid gold. Yes beer means many things to me that's all for now cus I gotta pee.

09-01-2005, 09:08 PM	#13
BowTieMan Registered User Join Date: Dec 2003 Location: Glendale Arizona Posts: 747	Ya I ran a vacum line straight to it and by-passed it and it runs so much better. And accelerates quicker and smoother. __________________ "A true hotrodder wouldn't be content untill he had created a car so violent, so hairy, so totally sick that the very act of dropping the hammer would result in instant death. Anything less results in the need to go faster." - Tony DeFeo



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