HELP! Keep it stock or go a little aftermarket
- Thread starter 454-k10
- Start date
Disclaimer: Links on this page pointing to Amazon, eBay and other sites may include affiliate code. If you click them and make a purchase, we may earn a small commission.
Craig 85
Full Access Member
- Joined
- Jan 25, 2017
- Posts
- 3,917
- Reaction score
- 4,116
- Location
- Nashville, TN
- First Name
- Craig
- Truck Year
- 1985
- Truck Model
- K30 SRW
- Engine Size
- 454/TH-400/NP205
@454-k10 sorry I wasn't paying close attention to your diagram. Both of my trucks had a 3 port valve in the thermostat and I see yours has 2. The EFE should hook in to a second 2 port valve that should be located on the intake manifold below the level of the thermostat. The idea is the valve will heat to temperature before the t-stat opens and heats the other 2 port valve you pictured. Based on your diagram. The EFE should be connected to the port closest to the bottom of the sensor on the intake.
I see another possible issue. It looks like one of the nipples on your TRC SOL CONT VALVE is broken off. There should be two. One looks like there is silicon on it (blue box). The red box is the TVS (throttle control valve) on your carburetor. The hose connected to it should be connected to the broken nipple in the blue box. The TVS is out of production. I just found one on e-Bay so I had a spare. It is also called a Throttle Kicker (GM 17057174, Rochester 57174, ACDelco 214-1019 or Carter 202-784).
The TRC (throttle return) solenoid is available through The Parts Place GM 1997479. Photo #2.
https://www.thepartsplaceinc.com/cl...t=Electrical and Switches&Subcat=TCS SWITCHES
I see another possible issue. It looks like one of the nipples on your TRC SOL CONT VALVE is broken off. There should be two. One looks like there is silicon on it (blue box). The red box is the TVS (throttle control valve) on your carburetor. The hose connected to it should be connected to the broken nipple in the blue box. The TVS is out of production. I just found one on e-Bay so I had a spare. It is also called a Throttle Kicker (GM 17057174, Rochester 57174, ACDelco 214-1019 or Carter 202-784).
The TRC (throttle return) solenoid is available through The Parts Place GM 1997479. Photo #2.
https://www.thepartsplaceinc.com/cl...t=Electrical and Switches&Subcat=TCS SWITCHES
You must be registered for see images attach
You must be registered for see images attach
1987 GMC Jimmy
Automobile Hoarder
- Joined
- Jan 23, 2016
- Posts
- 5,848
- Reaction score
- 2,389
- Location
- Mississippi
- First Name
- Jesse
- Truck Year
- 1987
- Truck Model
- V1500 Jimmy
- Engine Size
- 350
Oh, gotcha!
78C10BigTen
Full Access Member
- Joined
- Apr 12, 2017
- Posts
- 15,948
- Reaction score
- 25,339
- Location
- pennsylvannia
- First Name
- Ted
- Truck Year
- 1978
- Truck Model
- C10 BIG TEN
- Engine Size
- 350
My big ten has NO emissions what so ever! Love it! No cats, no egr no smog, dont need any crazy inspection.. cant beat it
DoubleDingo
Full Access Member
- Joined
- Jul 3, 2012
- Posts
- 11,250
- Reaction score
- 17,176
- Location
- Right where I am
- First Name
- Bagoomba
- Truck Year
- 1981
- Truck Model
- 81-C20 Silverado Camper Special-TH400-4.10s
- Engine Size
- Carb'ed Vortec 350
3/4 tons are easy to pass smog. 1/2 tons, not so much. I don't even have to let mine warm up to pass. But those of you that don't need to go through it, that's great. Here, you have to live in certain counties to not have to endure the smog testing every two years.
DoubleDingo
Full Access Member
- Joined
- Jul 3, 2012
- Posts
- 11,250
- Reaction score
- 17,176
- Location
- Right where I am
- First Name
- Bagoomba
- Truck Year
- 1981
- Truck Model
- 81-C20 Silverado Camper Special-TH400-4.10s
- Engine Size
- Carb'ed Vortec 350
Still digging how nice and original the OP's truck is 
78C10BigTen
Full Access Member
- Joined
- Apr 12, 2017
- Posts
- 15,948
- Reaction score
- 25,339
- Location
- pennsylvannia
- First Name
- Ted
- Truck Year
- 1978
- Truck Model
- C10 BIG TEN
- Engine Size
- 350
Here in PA its not smog but emissions. It depends on what county you live in that decides if you need emissions testing. Kind goes by population.
DoubleDingo
Full Access Member
- Joined
- Jul 3, 2012
- Posts
- 11,250
- Reaction score
- 17,176
- Location
- Right where I am
- First Name
- Bagoomba
- Truck Year
- 1981
- Truck Model
- 81-C20 Silverado Camper Special-TH400-4.10s
- Engine Size
- Carb'ed Vortec 350
It's emissions here too, but who calls it that...lol...
78C10BigTen
Full Access Member
- Joined
- Apr 12, 2017
- Posts
- 15,948
- Reaction score
- 25,339
- Location
- pennsylvannia
- First Name
- Ted
- Truck Year
- 1978
- Truck Model
- C10 BIG TEN
- Engine Size
- 350
Im exempt regardless lol
78C10BigTen
Full Access Member
- Joined
- Apr 12, 2017
- Posts
- 15,948
- Reaction score
- 25,339
- Location
- pennsylvannia
- First Name
- Ted
- Truck Year
- 1978
- Truck Model
- C10 BIG TEN
- Engine Size
- 350
I personally dont think emissions should matter on things like 95 and older.
454-k10
Full Access Member
- Joined
- Jul 18, 2016
- Posts
- 355
- Reaction score
- 56
- Location
- CO
- First Name
- Rodney
- Truck Year
- 1980
- Truck Model
- K10
- Engine Size
- 454
@Craig 85 so I'm having a hard time finding where this efe is supposed to plug into. I've got a random hose not hooked up to anything off that brown port on the air cleaner. Is that where it goes? There isn't any other ports near the thermostat. And the broken brown one, what plugs into the broken port? And the port on the thermostat housing, both houses go to the same place? Is that right?
You must be registered for see images attach
You must be registered for see images attach
You must be registered for see images attach
You must be registered for see images attach
You must be registered for see images attach
78C10BigTen
Full Access Member
- Joined
- Apr 12, 2017
- Posts
- 15,948
- Reaction score
- 25,339
- Location
- pennsylvannia
- First Name
- Ted
- Truck Year
- 1978
- Truck Model
- C10 BIG TEN
- Engine Size
- 350
Now i know my carb is diff but it looks like your truck has the right lines.... does yours have metal lines coming from here???
You must be registered for see images attach
You must be registered for see images attach
Craig 85
Full Access Member
- Joined
- Jan 25, 2017
- Posts
- 3,917
- Reaction score
- 4,116
- Location
- Nashville, TN
- First Name
- Craig
- Truck Year
- 1985
- Truck Model
- K30 SRW
- Engine Size
- 454/TH-400/NP205
You may be missing one of the 2 port ported vacuum switches. I only had one picture of my '79's engine before I sold it. The port was located in the intake manifold where your heater hose is. My heater hose was routed into the water pump by a PO, but I think it was supposed to be hooked up to the passenger side radiator tank. Could be different for your year.
The hose in your hand in your photo is supposed to hook up to the vacuum pod (secondary choke pull off) on the rear passenger side of the carb. Pod on the left in the below photo. The other hose next to it goes to the underside of the air cleaner to the thermostatic switch and terminates. There are 2 ports there, it looks like its green plastic on you photo. From there, the other side of that switch, connects to the top of the vacuum pod on the snorkel of the air cleaner.
Blue box below hooks to secondary cut-off. Red box is the EFE valve. This connects to the bottom of the 2 port ported vacuum switch that I believe is missing. I'm going to stop here and have you call me it would be a lot easier to explain the other connections and what I think my be missing. I'll pm my number.
The hose in your hand in your photo is supposed to hook up to the vacuum pod (secondary choke pull off) on the rear passenger side of the carb. Pod on the left in the below photo. The other hose next to it goes to the underside of the air cleaner to the thermostatic switch and terminates. There are 2 ports there, it looks like its green plastic on you photo. From there, the other side of that switch, connects to the top of the vacuum pod on the snorkel of the air cleaner.
You must be registered for see images attach
Blue box below hooks to secondary cut-off. Red box is the EFE valve. This connects to the bottom of the 2 port ported vacuum switch that I believe is missing. I'm going to stop here and have you call me it would be a lot easier to explain the other connections and what I think my be missing. I'll pm my number.
You must be registered for see images attach
454-k10
Full Access Member
- Joined
- Jul 18, 2016
- Posts
- 355
- Reaction score
- 56
- Location
- CO
- First Name
- Rodney
- Truck Year
- 1980
- Truck Model
- K10
- Engine Size
- 454
@Craig 85
Well, I ordered a pvs off of rock auto. I hope its the right one. I'm going to get a new heater hose and put it to the water pump and put the pvs in the intake manifold. I ordered the one that goes in air cleaner too. Also a new TCS from the parts place. Once everything gets here I'll get a 5-6 feet of vacuum line and replace all of it. Thanks again Craig. And thank you to everyone who chimed in helping me. I wanted to know others thought about keeping it original.
Well, I ordered a pvs off of rock auto. I hope its the right one. I'm going to get a new heater hose and put it to the water pump and put the pvs in the intake manifold. I ordered the one that goes in air cleaner too. Also a new TCS from the parts place. Once everything gets here I'll get a 5-6 feet of vacuum line and replace all of it. Thanks again Craig. And thank you to everyone who chimed in helping me. I wanted to know others thought about keeping it original.
