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, 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.

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.

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

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

78Chevy · 02-23-2007, 11:05 PM

Quote:

Originally Posted by shrtbx

yes 86 california models have a map sensor.

Maybe that is what the blue one is in the second pic.....

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...

shrtbx · 02-23-2007, 11:10 PM

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

pcmcobra · 02-23-2007, 11:42 PM

Quote:

Originally Posted by shrtbx

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.

it's not a CA equipped truck it was bought new in georgia...
but thx, you guys are "learnin'" me tonight.

shrtbx · 02-23-2007, 11:56 PM

you do have a computer controlled carb though. A few states have same set up as california cars as far as smog goes. Just the tests are not as harsh as cali. I dont know if georgia is one of them. you just have one smog air tube on each side? It looks like it.

pcmcobra · 02-23-2007, 11:58 PM

Quote:

Originally Posted by shrtbx

you do have a computer controlled carb though. A few states have same set up as california cars as far as smog goes. Just the tests are not as harsh as cali. I dont know if georgia is one of them. you just have one smog air tube on each side? It looks like it.

hmmm. I need to look into this.
Where would the carb ecm be mounted?

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

78Chevy · 02-24-2007, 12:11 AM

Quote:

Originally Posted by Restrorob

THIS is the red one;

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

Sorry, I got lost in the confussion.

Your right.

Al

shrtbx · 02-24-2007, 12:18 AM

any of you running thorley headers?

ChevyTech · 02-24-2007, 01:07 AM

As for the red circle in the last photo:
I know that connecter looks just like the connector for the mixture control solenoid, on the computer controlled carburetors but, on a 1986 full size pickup they had a solenoid control dual capacity accelerator pump and that is what that connector is for. Notice there is no connector on the front of the carb for the TPS for a computer controlled carb. Also notice no idle air bleed screw or place for it.

Quote:

Originally Posted by Slonaker

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

I agree with Slonaker no sensor Map on 86 full size pickup. Also right about it having a
dual capacity accelerator pump and the temp switch for it.

Quote:

Originally Posted by piecesparts

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

Quote:

Originally Posted by Mickey_D

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 & Mickey_D, Yes - Applause for you both

First picture gray circle, I agree with Srubydo1986 , is the temp sender for the dash.

Slonaker · 02-24-2007, 01:13 AM

[QUOTE=shrtbx;2045428]you do have a computer controlled carb though. QUOTE]

It is not a computer controlled carb. The electrical connector is for a dual capacity accelerator pump. It is just an '85-'86 thing on trucks. The carb model is an M4MED. You can read about it here:

http://www.73-87.com/7387garage/drivetrain/myqjet.htm

Try googling for M4MED and see what folks have to say about it.

Slonaker

EDIT: Thanks ChevyTech. You type faster than I do.

shrtbx · 02-24-2007, 01:23 AM

are you saying for all 86 full size trucks there are no map sensors. My 86 silverado has one. Its a ca car. california pollution controlled carbs came with the e4me.

ChevyTech · 02-24-2007, 01:23 AM

[QUOTE=Slonaker;2045582]

Quote:

Originally Posted by shrtbx

you do have a computer controlled carb though. QUOTE]

It is not a computer controlled carb. The electrical connector is for a dual capacity accelerator pump. It is just an '85-'86 thing on trucks. The carb model is an M4MED. You can read about it here:

http://www.73-87.com/7387garage/drivetrain/myqjet.htm

Try googling for M4MED and see what folks have to say about it.

Slonaker

EDIT: Thanks ChevyTech. You type faster than I do.

I am surprised you knew about it. I though everyone would be arguing with me about it.

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, 07:57 PM	#4
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	#5
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	#6
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, 10:57 PM	#10
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	#11
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	#12
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, 11:10 PM	#15
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.

02-23-2007, 11:56 PM	#17
shrtbx Registered User Join Date: Feb 2007 Location: los angeles Posts: 202	Re: More engine compartment and "what is this"? you do have a computer controlled carb though. A few states have same set up as california cars as far as smog goes. Just the tests are not as harsh as cali. I dont know if georgia is one of them. you just have one smog air tube on each side? It looks like it.

02-24-2007, 12:01 AM	#19
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, 12:18 AM	#21
shrtbx Registered User Join Date: Feb 2007 Location: los angeles Posts: 202	Re: More engine compartment and "what is this"? any of you running thorley headers?

02-24-2007, 01:13 AM	#23
Slonaker Insert Witty Text Here Join Date: Oct 2002 Location: San Antonio, TX Posts: 3,415	Re: More engine compartment and "what is this"? [QUOTE=shrtbx;2045428]you do have a computer controlled carb though. QUOTE] It is not a computer controlled carb. The electrical connector is for a dual capacity accelerator pump. It is just an '85-'86 thing on trucks. The carb model is an M4MED. You can read about it here: http://www.73-87.com/7387garage/drivetrain/myqjet.htm Try googling for M4MED and see what folks have to say about it. Slonaker EDIT: Thanks ChevyTech. You type faster than I do. __________________ '86 Chevy C10 (Sold 04/19/13 ) Stock '01 Silverado Last edited by Slonaker; 02-24-2007 at 01:14 AM.

02-24-2007, 01:23 AM	#24
shrtbx Registered User Join Date: Feb 2007 Location: los angeles Posts: 202	Re: More engine compartment and "what is this"? are you saying for all 86 full size trucks there are no map sensors. My 86 silverado has one. Its a ca car. california pollution controlled carbs came with the e4me. Last edited by shrtbx; 02-24-2007 at 01:26 AM.



Register or Log In To remove these advertisements.

Register or Log In To remove these advertisements.