What does this do? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

dubie · 11-30-2004, 09:24 PM

I was working under the hood of the truck and was wondering what this is?
It has a blue, black and white wire coming from it. I have open ends on the blue and white wire and the black (maybe green) goes to the tranny.
So.....what's it do?

Sweet72 · 11-30-2004, 09:43 PM

TCS system (Transmission/Temperature Controlled Spark). Allows vacuum timing advance only in high gear and when water temp is above 82 deg. F. That connector is attached to the system time delay relay. Your better off deleting this system or just bypass the vacuum solenoid so the distributor receives vacuum all the time.

71-longbed · 11-30-2004, 10:00 PM

i yanked out my idle solenoid last weekend and hooked the dzzy to manifold vacuum .. i would love some pics on how to get rid of the other wiring and such thats involved with this system .. thanks

Sweet72 · 11-30-2004, 10:26 PM

Posted by 71-longbed: i yanked out my idle solenoid last weekend

71-longbed, I hope you didn't yank the idle stop solenoid or you'll have a hell of a time getting her to idle and shut off when hot IF you still have the Q-jet in there.
Okay, I know what you meant, TCS solenoid valve right?

71-longbed · 11-30-2004, 10:39 PM

huh ?? this is what i pulled

72 CustomCamper · 12-01-2004, 12:41 AM

I've always pulled those off and never had a problem...

**passthebuck** · 12-01-2004, 03:15 AM

dont touch that wire Tim! that controls the lights in that "special" mine in your town! those with galucoma will be pi**ed at you!

71-longbed · 12-01-2004, 03:42 AM

thats alittle paranoid

*Gee_Emm* · 12-01-2004, 10:22 AM

For my Jimmy I had a manual tranny harness with that thingy on it. I just bought a repro auto tranny harness and the wire for that thingy isn't there. Why would GM put it there if we don't need it?

**CPNE** · 12-01-2004, 11:17 AM

Quote:

Originally Posted by Gee_Emm

For my Jimmy I had a manual tranny harness with that thingy on it. I just bought a repro auto tranny harness and the wire for that thingy isn't there. Why would GM put it there if we don't need it?

Emissions is why

chickenwing · 12-01-2004, 10:59 AM

I thought that thing kicked on when the a/c was in operation. How's it work/what's it do. Hope I'm not strayin too far from the post.

dubie · 12-01-2004, 11:02 AM

i just wanna know if I can take the damn thing off

Without it fkin something else up

**CPNE** · 12-01-2004, 11:22 AM

Quote:

Originally Posted by dubie

i just wanna know if I can take the damn thing off

Without it fkin something else up

MUTT will run fine, however you'll be the primary cause of the huge hole in the ozone layer above Flin Flon and ultimately global warming. Plus those extra emissions will come down in the form of acid rain in New England, damaging my paint job

dubie · 12-01-2004, 11:27 AM

We have a ton of acid rain here from the Copper Smelter dumping crap all oevr town. It has eaten many paitn jobs. One of the main reasons I used industrial single stage enamel on the MUTT

Good, if I don't need that thing on the firewall I'm takin it off. One wire goes to the tranny and the other 2 have open ends and aren't hooked to anything

**StingRay** · 12-01-2004, 11:58 AM

That thing can come off. The solenoid in 71-longbeds post is an idle stop solenoid. It actually is for setting idle speed. It is hooked to ignition on power and the lever on the carb rests against it. You turn the plunger in and out to set your idle speed. It's great if you have an engine that tends to run on after shut down. When you turn the key off the solenoid de-energises and the carb butterflies shut completely so it can't diesel.

sactoC10 · 12-01-2004, 02:31 PM

StingRay...

Good bit of info there, thanks!

11-30-2004, 09:24 PM	#1
dubie Registered User Join Date: May 2000 Location: Flin Flon, Manitoba, Canada Posts: 8,853	What does this do? I was working under the hood of the truck and was wondering what this is? It has a blue, black and white wire coming from it. I have open ends on the blue and white wire and the black (maybe green) goes to the tranny. So.....what's it do? Attached Images __________________ My name's Tim and I'm a truckaholic My 56 Chevy shop truck build http://67-72chevytrucks.com/vboard/s...d.php?t=562795

11-30-2004, 09:43 PM	#2
Sweet72 Registered User Join Date: Nov 2003 Location: Alexandria, VA Posts: 1,534	TCS system (Transmission/Temperature Controlled Spark). Allows vacuum timing advance only in high gear and when water temp is above 82 deg. F. That connector is attached to the system time delay relay. Your better off deleting this system or just bypass the vacuum solenoid so the distributor receives vacuum all the time. __________________ '72 GMC SWB C1500 Custom, frame-off in progress. 383 SBC, 9:1CR, Comp Cams XE262H, Scat internal balanced crank, Eagle SIR 6" rods, Keith Black dish pistons, Dart Iron Eagle 72/180 heads, Weiand Stealth intake, Stewart stage I water pump, Holley 4bbl vac sec, TH350 with B&M Shift Improver Kit. 12 bolt positraction. Last edited by Sweet72; 11-30-2004 at 09:47 PM.

11-30-2004, 10:00 PM	#3
71-longbed Its Magically Delicious Join Date: Jan 2003 Location: oregon Posts: 2,398	i yanked out my idle solenoid last weekend and hooked the dzzy to manifold vacuum .. i would love some pics on how to get rid of the other wiring and such thats involved with this system .. thanks __________________ 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.

11-30-2004, 10:26 PM	#4
Sweet72 Registered User Join Date: Nov 2003 Location: Alexandria, VA Posts: 1,534	Posted by 71-longbed: i yanked out my idle solenoid last weekend 71-longbed, I hope you didn't yank the idle stop solenoid or you'll have a hell of a time getting her to idle and shut off when hot IF you still have the Q-jet in there. Okay, I know what you meant, TCS solenoid valve right? __________________ '72 GMC SWB C1500 Custom, frame-off in progress. 383 SBC, 9:1CR, Comp Cams XE262H, Scat internal balanced crank, Eagle SIR 6" rods, Keith Black dish pistons, Dart Iron Eagle 72/180 heads, Weiand Stealth intake, Stewart stage I water pump, Holley 4bbl vac sec, TH350 with B&M Shift Improver Kit. 12 bolt positraction.

11-30-2004, 10:39 PM	#5
71-longbed Its Magically Delicious Join Date: Jan 2003 Location: oregon Posts: 2,398	huh ?? this is what i pulled Attached Images __________________ 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.

12-01-2004, 12:41 AM	#6
72 CustomCamper huh ??? Join Date: Nov 2002 Location: Fredericksburg,Va. Posts: 3,368	I've always pulled those off and never had a problem... __________________ 90 Blazer Silverado 350w/ 700R4 and 32" Kelly's "I am a bomb technician. If you see me running try to keep up!"

12-01-2004, 03:15 AM	#7
passthebuck Sisyphus was my mentor! Join Date: Sep 2002 Location: Carleton Place, Ontario CANADA Posts: 984	dont touch that wire Tim! that controls the lights in that "special" mine in your town! those with galucoma will be pi**ed at you! __________________ passthebuck #5642 -TWO 1967 GMC 910's. One with L6/3-on-the tree and the other with 355 w/435hp & a 700r4. -a 2013 Honda Civic as my "sensible" car

12-01-2004, 03:42 AM	#8
71-longbed Its Magically Delicious Join Date: Jan 2003 Location: oregon Posts: 2,398	thats alittle paranoid __________________ 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.

12-01-2004, 10:22 AM	#9
Gee_Emm Account Suspended Join Date: Sep 2000 Posts: 3,991	For my Jimmy I had a manual tranny harness with that thingy on it. I just bought a repro auto tranny harness and the wire for that thingy isn't there. Why would GM put it there if we don't need it?

12-01-2004, 10:59 AM	#11
chickenwing Lovin' Life in Miss.! Join Date: Mar 2004 Location: Puckett, Mississippi Posts: 1,937	I thought that thing kicked on when the a/c was in operation. How's it work/what's it do. Hope I'm not strayin too far from the post. __________________ The truck... you hear that? No really, you did hear that?!!!

12-01-2004, 11:02 AM	#12
dubie Registered User Join Date: May 2000 Location: Flin Flon, Manitoba, Canada Posts: 8,853	i just wanna know if I can take the damn thing off Without it fkin something else up __________________ My name's Tim and I'm a truckaholic My 56 Chevy shop truck build http://67-72chevytrucks.com/vboard/s...d.php?t=562795

12-01-2004, 11:27 AM	#14
dubie Registered User Join Date: May 2000 Location: Flin Flon, Manitoba, Canada Posts: 8,853	We have a ton of acid rain here from the Copper Smelter dumping crap all oevr town. It has eaten many paitn jobs. One of the main reasons I used industrial single stage enamel on the MUTT Good, if I don't need that thing on the firewall I'm takin it off. One wire goes to the tranny and the other 2 have open ends and aren't hooked to anything __________________ My name's Tim and I'm a truckaholic My 56 Chevy shop truck build http://67-72chevytrucks.com/vboard/s...d.php?t=562795

12-01-2004, 11:58 AM	#15
StingRay Senior Member Join Date: Mar 2000 Location: Saskatoon,SK,Canada Posts: 2,476	That thing can come off. The solenoid in 71-longbeds post is an idle stop solenoid. It actually is for setting idle speed. It is hooked to ignition on power and the lever on the carb rests against it. You turn the plunger in and out to set your idle speed. It's great if you have an engine that tends to run on after shut down. When you turn the key off the solenoid de-energises and the carb butterflies shut completely so it can't diesel. __________________ Saskatoon, Saskatchewan Canada

12-01-2004, 02:31 PM	#16
sactoC10 71 DELUX Join Date: Sep 2003 Location: Northern CA / Sac Posts: 1,055	StingRay... Good bit of info there, thanks! __________________ 5/4 drop LWB wood bed - 15x8 front 235/60 - 15x10 rear 295/50 2003 FORD Escape 1998 Honda VTR1000

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