More engine compartment and "what is this"? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

pcmcobra · 02-23-2007, 07:13 PM

Ok guys,
here are some more pics. I have been reading my manuals, chiltons and haynes, have not picked up a factory service manual YET...
Anyway, any help in identifying these would be a big help. On the carb pic, that white/off white looking connector (circled in red)...I barely touched that thing and the clip broke, so I zip tied it for now. Have no clue what it is/does...
The others...I have looked on the wiring diagrams, but they did not help me much, one diagram said oil pressure sensor...
One way or the other, I will know what these are and what they do. Hope this post helps others as well. Thx

Drivers side:

Behind carb:

Passenger side:

Carb:

Srubydo1986 · 02-23-2007, 07:15 PM

first pic on is temp sensor , 3rd pic is for oil probly tell u if ur low no clue i just hook it up

Restrorob · 02-23-2007, 07:31 PM

The one in red is the map sensor, Yellow one is the AC idle solenoid to up the idle when the AC is turned on.....

pcmcobra · 02-23-2007, 10:37 PM

Quote:

Originally Posted by Restrorob

The one in red is the map sensor, Yellow one is the AC idle solenoid to up the idle when the AC is turned on.....

Been looking online for a "replacement" connector plug for this. I must be searching wrong, but map sensor on all the big auto parts sites come up with one of those black rectangular maps with 2 mounting screws, nothing like the one pictured. Any ideas where I can get a new connector for it, or if I have to buy a new map, that's fine too.

Restrorob · 02-23-2007, 10:56 PM

Quote:

Originally Posted by pcmcobra

, but map sensor on all the big auto parts sites come up with one of those black rectangular maps with 2 mounting screws.

Sorry....That is not the map, That's the pump solenoid. I've only been out of the auto biz for 16 yrs. Try your local junk yards for a plug or try the dealer.

78Chevy · 02-23-2007, 10:57 PM

I don't want to step on anybody's toes here, but... the "thing" circled in red is the mixture control solenoid for the carb... Try researching for a conector using this info.

Hope this helps.

Al

shrtbx · 02-23-2007, 11:01 PM

yes 86 california models have a map sensor. From the looks of your carb you have an e4me (computer controlled carb). Which proboably means your car has ca emissons set up. the pump solenoid controls regulates your trucks engine at idle. Looks like you have a dual air smog tube set up as well.

Restrorob · 02-23-2007, 11:04 PM

THIS is the red one;

http://www.partsamerica.com/ProductD...pe=904&ptset=A

pcmcobra · 02-23-2007, 11:09 PM

Quote:

Originally Posted by 78Chevy

I don't want to step on anybody's toes here, but... the "thing" circled in red is the mixture control solenoid for the carb... Try researching for a conector using this info.

Hope this helps.

Al

thx, googling now...

Slonaker · 02-23-2007, 10:55 PM

Quote:

Originally Posted by Restrorob

The one in red is the map sensor

The red one isn't a MAP sensor. The truck does not have one in '86 (not sure about CA emissions) It controls a two stage accelerator pump or something like that. The temp switch in purple controls it.

Slonaker

pcmcobra · 02-23-2007, 07:57 PM

thx guys, keep it coming!

Mickey_D · 02-23-2007, 09:23 PM

One of the ones by the exhaust manifold (gray or orange) is going to be your ignition knock sensor.

Purple in the last pic is a temp sensor.

piecesparts · 02-23-2007, 10:10 PM

The third one is the Knock sensor on the right hand side of the motor.

shrtbx · 02-23-2007, 11:10 PM

if it has a small vaccum hole leading into it then it proboably is the map sensor.

shrtbx · 02-24-2007, 12:01 AM

its usually mounted on the firewall...Look under your steering will in the cab...see if you have a aldl hook up. looks like a plug ..lots of lil prong holes

Slonaker · 02-24-2007, 01:41 AM

I think (but I am not sure...) that '86 CA emissions pickups use a computer controlled carb. The original poster, whose truck we are attempting to identify parts on, said he does not have CA emissions.

Slonaker

shrtbx · 02-24-2007, 01:44 AM

yeah its very simple. actually i really dont see the need for the feature. But who knows what GM was thinking. Fuel injection systems like tbi can be simple you just have to take it one step at a time. People see all the wires and what not and right off the bat they are forget it. I use to have a vette that was tbi controlled an 84..It was a beast of a task at first but once you know your way around it its ok....I learned about fi before i learned about carbs ironic. lol

shrtbx · 02-24-2007, 01:46 AM

what I have a question about..not to take away from the original poster. is about the smog tubes...why is it that some trucks have 4 air tubes coming from the exhaust manifold while others have just one...This is where everyone gets quiet lol

ChevyTech · 02-24-2007, 01:58 AM

Quote:

Originally Posted by shrtbx

what I have a question about..not to take away from the original poster. is about the smog tubes...why is it that some trucks have 4 air tubes coming from the exhaust manifold while others have just one...This is where everyone gets quiet lol

A.I.R. tubes put oxygen into the hot exhaust to finish burning any unburned fuel.

I would think the four tube setup would get the oxygen in where the gases are the hottest. Maybe one tube was good enough to get it past the emission testing and was a few pennies less to build.

shrtbx · 02-24-2007, 02:06 AM

take a look at a stock exhause manifold with air tubes..then look at a set of thorleys with bung holes..you will see what im talking about

shrtbx · 02-24-2007, 02:05 AM

Yeah i know the function of them. I just dont know what type of headers to get for the truck based on this. The original poster has smog tubes like mine. ONE tube on the front of each exhaust manifold. The other manifolds i have seen have 4 air tubes coming out of the bottom that connect to a single tube. I dont see how they fit onto thorley headers that have bungs holes on the top being that the 4 air tubes come out from the bottom and turn up at a 90 degree angle.

84slopwaggin · 02-24-2007, 05:10 AM

"These carbs aren't computer controlled as many people think. The only thing electrical about them is the dual capacity pump. The carb has to be plugged to the sensor in the thermostat housing in order to work right. If it isn't, the pump solenoid will stay closed all the time and waste fuel."

What does he mean when he says waste fuel? I removed it from my truck and installed a chrome thermostat housing. I suppose fuel economy goes south. I want to do a intake/carb swap in the future. Hopefully I can gain some more performance with these modifications. The trucks runs alot better with the air pump removed. I read somewhere where the dual capacity pump can cause the vehicle to stumble and stutter. That was reason enough for me to not use it. I'm not into fuel consumption if its not done by a overdrive transmission. I'm even open to Holley double pumpers on automatic tranny vehicles.

84slopwaggin · 02-24-2007, 05:17 AM

Hey SHRTBX checked this post out. It may help you out.

http://67-72chevytrucks.com/vboard/s...d.php?t=217997

Slonaker · 02-24-2007, 10:33 AM

SHRTBX: Swervin Ervin has some smog legal headers on his truck. Edelbrock, maybe? I'm not sure. He might be able to help you with the header issue, though he does not have a CA truck.

Slonaker

piecesparts · 02-24-2007, 01:34 PM

Are we sure the red one is not a TCC switch for the tranny?

02-23-2007, 07:13 PM	#1
pcmcobra Registered User Join Date: Aug 2006 Location: Florida Posts: 1,684	More engine compartment and "what is this"? Ok guys, here are some more pics. I have been reading my manuals, chiltons and haynes, have not picked up a factory service manual YET... Anyway, any help in identifying these would be a big help. On the carb pic, that white/off white looking connector (circled in red)...I barely touched that thing and the clip broke, so I zip tied it for now. Have no clue what it is/does... The others...I have looked on the wiring diagrams, but they did not help me much, one diagram said oil pressure sensor... One way or the other, I will know what these are and what they do. Hope this post helps others as well. Thx Drivers side: Behind carb: Passenger side: Carb: __________________ 1986 C10 SWB 6.0/6l90e Miami...Flee it like a native

02-23-2007, 07:15 PM	#2
Srubydo1986 The Crazy Machanic Join Date: Jan 2007 Location: Nokesville Va Posts: 1,437	Re: More engine compartment and "what is this"? first pic on is temp sensor , 3rd pic is for oil probly tell u if ur low no clue i just hook it up

02-23-2007, 07:31 PM	#3
Restrorob The One And Only !!! Join Date: Jan 2007 Location: Hole in the woods Florida Posts: 4,567	Re: More engine compartment and "what is this"? The one in red is the map sensor, Yellow one is the AC idle solenoid to up the idle when the AC is turned on..... __________________ 93 Jeep XJ 88 Buick La Sabra Toys; 88 TA-GTA in the works.... 97 GMC Ext. Cab 502 Crate 5 Spd......Sucks Gas But Haulz Azz ! The primary function of an Engineer is to make it difficult for the Fabricator and impossible for the Mechanic. *"Why go out preserved when you can go out beat up, worn out, sliding in sideways screaming, Holy Sh!t What A Ride" !!!*

02-23-2007, 10:57 PM	#6
78Chevy Registered User Join Date: Nov 2006 Location: Malvern, AR Posts: 80	Re: More engine compartment and "what is this"? I don't want to step on anybody's toes here, but... the "thing" circled in red is the mixture control solenoid for the carb... Try researching for a conector using this info. Hope this helps. Al __________________ _____________________________________________ 97 K1500 Tahoe 5.7 Stock "Driver" 78 swb C10 Silverodo/ 350cu. dual Flowmaster's, MSD cap, and wires. "Project" LONG LIVE AMERICA!!

02-23-2007, 11:01 PM	#7
shrtbx Registered User Join Date: Feb 2007 Location: los angeles Posts: 202	Re: More engine compartment and "what is this"? yes 86 california models have a map sensor. From the looks of your carb you have an e4me (computer controlled carb). Which proboably means your car has ca emissons set up. the pump solenoid controls regulates your trucks engine at idle. Looks like you have a dual air smog tube set up as well. Last edited by shrtbx; 02-23-2007 at 11:07 PM.

02-23-2007, 11:04 PM	#8
Restrorob The One And Only !!! Join Date: Jan 2007 Location: Hole in the woods Florida Posts: 4,567	Re: More engine compartment and "what is this"? THIS is the red one; http://www.partsamerica.com/ProductD...pe=904&ptset=A __________________ 93 Jeep XJ 88 Buick La Sabra Toys; 88 TA-GTA in the works.... 97 GMC Ext. Cab 502 Crate 5 Spd......Sucks Gas But Haulz Azz ! The primary function of an Engineer is to make it difficult for the Fabricator and impossible for the Mechanic. *"Why go out preserved when you can go out beat up, worn out, sliding in sideways screaming, Holy Sh!t What A Ride" !!!*

02-23-2007, 07:57 PM	#11
pcmcobra Registered User Join Date: Aug 2006 Location: Florida Posts: 1,684	Re: More engine compartment and "what is this"? thx guys, keep it coming! __________________ 1986 C10 SWB 6.0/6l90e Miami...Flee it like a native

02-23-2007, 09:23 PM	#12
Mickey_D Dirteh Kitteh Join Date: Nov 2006 Location: Mormon country Posts: 2,484	Re: More engine compartment and "what is this"? One of the ones by the exhaust manifold (gray or orange) is going to be your ignition knock sensor. Purple in the last pic is a temp sensor. __________________ Darrin 1955 Willys CJ-5 all original and the oldest CJ-5 on the road. 2001 Dodge Neon (wife's car) 1995 Jeep Grand Cherokee Limited Edition SOLD 1981 K15 Custom Deluxe 4X4, rusty but trusty wood hauler. SOLD 1993 S-10 4X4 Tahoe SOLD Sign up with the Contact List RIP ESLL Last edited by Mickey_D; 02-23-2007 at 09:24 PM.

02-23-2007, 10:10 PM	#13
piecesparts Parts and more parts Join Date: Nov 2003 Location: Lebo, Kansas (middle of nowhere Posts: 6,821	Re: More engine compartment and "what is this"? The third one is the Knock sensor on the right hand side of the motor.

02-23-2007, 11:10 PM	#14
shrtbx Registered User Join Date: Feb 2007 Location: los angeles Posts: 202	Re: More engine compartment and "what is this"? if it has a small vaccum hole leading into it then it proboably is the map sensor.

02-24-2007, 12:01 AM	#15
shrtbx Registered User Join Date: Feb 2007 Location: los angeles Posts: 202	Re: More engine compartment and "what is this"? its usually mounted on the firewall...Look under your steering will in the cab...see if you have a aldl hook up. looks like a plug ..lots of lil prong holes Last edited by shrtbx; 02-24-2007 at 12:04 AM.

02-24-2007, 01:41 AM	#16
Slonaker Insert Witty Text Here Join Date: Oct 2002 Location: San Antonio, TX Posts: 3,415	Re: More engine compartment and "what is this"? I think (but I am not sure...) that '86 CA emissions pickups use a computer controlled carb. The original poster, whose truck we are attempting to identify parts on, said he does not have CA emissions. Slonaker __________________ '86 Chevy C10 (Sold 04/19/13 ) Stock '01 Silverado

02-24-2007, 01:44 AM	#17
shrtbx Registered User Join Date: Feb 2007 Location: los angeles Posts: 202	Re: More engine compartment and "what is this"? yeah its very simple. actually i really dont see the need for the feature. But who knows what GM was thinking. Fuel injection systems like tbi can be simple you just have to take it one step at a time. People see all the wires and what not and right off the bat they are forget it. I use to have a vette that was tbi controlled an 84..It was a beast of a task at first but once you know your way around it its ok....I learned about fi before i learned about carbs ironic. lol

02-24-2007, 01:46 AM	#18
shrtbx Registered User Join Date: Feb 2007 Location: los angeles Posts: 202	Re: More engine compartment and "what is this"? what I have a question about..not to take away from the original poster. is about the smog tubes...why is it that some trucks have 4 air tubes coming from the exhaust manifold while others have just one...This is where everyone gets quiet lol Last edited by shrtbx; 02-24-2007 at 01:49 AM.

02-24-2007, 02:06 AM	#20
shrtbx Registered User Join Date: Feb 2007 Location: los angeles Posts: 202	Re: More engine compartment and "what is this"? take a look at a stock exhause manifold with air tubes..then look at a set of thorleys with bung holes..you will see what im talking about



Register or Log In To remove these advertisements.

02-24-2007, 02:05 AM	#21
shrtbx Registered User Join Date: Feb 2007 Location: los angeles Posts: 202	Re: More engine compartment and "what is this"? Yeah i know the function of them. I just dont know what type of headers to get for the truck based on this. The original poster has smog tubes like mine. ONE tube on the front of each exhaust manifold. The other manifolds i have seen have 4 air tubes coming out of the bottom that connect to a single tube. I dont see how they fit onto thorley headers that have bungs holes on the top being that the 4 air tubes come out from the bottom and turn up at a 90 degree angle.

02-24-2007, 05:10 AM	#22
84slopwaggin Registered User Join Date: Apr 2005 Location: Ar Posts: 558	Re: More engine compartment and "what is this"? "These carbs aren't computer controlled as many people think. The only thing electrical about them is the dual capacity pump. The carb has to be plugged to the sensor in the thermostat housing in order to work right. If it isn't, the pump solenoid will stay closed all the time and waste fuel." What does he mean when he says waste fuel? I removed it from my truck and installed a chrome thermostat housing. I suppose fuel economy goes south. I want to do a intake/carb swap in the future. Hopefully I can gain some more performance with these modifications. The trucks runs alot better with the air pump removed. I read somewhere where the dual capacity pump can cause the vehicle to stumble and stutter. That was reason enough for me to not use it. I'm not into fuel consumption if its not done by a overdrive transmission. I'm even open to Holley double pumpers on automatic tranny vehicles.

02-24-2007, 05:17 AM	#23
84slopwaggin Registered User Join Date: Apr 2005 Location: Ar Posts: 558	Re: More engine compartment and "what is this"? Hey SHRTBX checked this post out. It may help you out. http://67-72chevytrucks.com/vboard/s...d.php?t=217997

02-24-2007, 10:33 AM	#24
Slonaker Insert Witty Text Here Join Date: Oct 2002 Location: San Antonio, TX Posts: 3,415	Re: More engine compartment and "what is this"? SHRTBX: Swervin Ervin has some smog legal headers on his truck. Edelbrock, maybe? I'm not sure. He might be able to help you with the header issue, though he does not have a CA truck. Slonaker __________________ '86 Chevy C10 (Sold 04/19/13 ) Stock '01 Silverado

02-24-2007, 01:34 PM	#25
piecesparts Parts and more parts Join Date: Nov 2003 Location: Lebo, Kansas (middle of nowhere Posts: 6,821	Re: More engine compartment and "what is this"? Are we sure the red one is not a TCC switch for the tranny?

Register or Log In To remove these advertisements.