More engine compartment and "what is this"?

[pcmcobra]

Originally Posted by piecesparts

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

red circled device is the mixture control solenoid. I have checked this via google and many online parts stores.

I will take another pic later today of the "blue" circled device.

[ChevyTech]

Originally Posted by pcmcobra

red circled device is the mixture control solenoid. I have checked this via google and many online parts stores.

I will take another pic later today of the "blue" circled device.

I hesitated to reply to this thread because people get it in there mind these M4MED carburetors are computer controlled and become the obstacle to any progress in helping them.
I will say this one last time and then stay away from this post.
The carburetor in the photo is NOT computer controlled with a mixture solenoid; it's a M4MED q-jet.

Look for Part #260 at this link
http://www.tocmp.com/manuals/Carbs/R...age056_jpg.htm

Look for Part #260 at this link
http://www.tocmp.com/manuals/Carbs/R...age057_jpg.htm



Here are some more links you my want to look at about the same subject.
http://67-72chevytrucks.com/vboard/s...ad.php?t=82405

http://67-72chevytrucks.com/vboard/s...ad.php?t=72313

http://67-72chevytrucks.com/vboard/s...ead.php?t=3950

http://www.thirdgen.org/techboard/ca...jet-305-a.html


Slonaker is trying to help you, try and listen.

[pcmcobra]

Originally Posted by ChevyTech

I hesitated to reply to this thread because people get it in there mind these M4MED carburetors are computer controlled and become the obstacle to any progress in helping them.
I will say this one last time and then stay away from this post.
The carburetor in the photo is NOT computer controlled with a mixture solenoid; it's a M4MED q-jet.

Look for Part #260 at this link
http://www.tocmp.com/manuals/Carbs/R...age056_jpg.htm

Look for Part #260 at this link
http://www.tocmp.com/manuals/Carbs/R...age057_jpg.htm



Here are some more links you my want to look at about the same subject.
http://67-72chevytrucks.com/vboard/s...ad.php?t=82405

http://67-72chevytrucks.com/vboard/s...ad.php?t=72313

http://67-72chevytrucks.com/vboard/s...ead.php?t=3950

http://www.thirdgen.org/techboard/ca...jet-305-a.html


Slonaker is trying to help you, try and listen.

I am trying to learn here, I do know now that the carb is NOT computer controlled, but different answers had me confused as to what the actual part name was. Chill dude, it's only a part...

[Slonaker]

I think that the red one would be a mixture contol solenoid only if it was a computer controlled carb.

Slonaker

[pcmcobra]

Originally Posted by Slonaker

I think that the red one would be a mixture contol solenoid only if it was a computer controlled carb.

Slonaker

http://www.tocmp.com/manuals/Carbs/R...age056_jpg.htm
part 260

http://www.tocmp.com/manuals/Carbs/R...age057_jpg.htm
Solenoid Dual capacity pump.

--------------------
So this is the name for it? Solenoid Dual capacity pump
Or is the name getting lost in translation? Is it also called mixture control solenoid, or is that something different all together?
Just want some clarification.
thx all.

[pcmcobra]

Hey all,
thx for the responses. A little confusion somewhere, but glad we are getting somewhere. Just trying to get the info, because I did not know. Learn something new everyday.
thx

[Slonaker]

Her is my assessment. If I am wrong, I hope someone will correct me. It looks like several people will.

There are two types of quadrajets from this era. They look very similar. They both have an electrical plug on them in the same spot, whcih leads people to believe they are the same carb. The connector serves a different function on each of them.

M4MED
This is the carb in pcmcobra's pic. It is not computer controlled. It is found on '85 and '86 federal (AKA non california emissions) pickups. The electrical connector is for a dual capacity accelerator pump solenoid. The accelerator pump squirts one amount of fuel if the sender on the thermostat housing indicates a coolant temp of under 170degrees fahrenheit and another amount if the coolant temp is above 170.


E4ME
This carb is computer controlled. It is used on cars from this era, and possibly trucks with California emissions. The electrical connector on it looks very similar to the one on the M4MED, but is for the mixture control solenoid. The truck's computer controls the carb's air/fuel mixture somehow with this solenoid.

Slonaker

[greg0380]

your right chevytech. I had that exact same carb on my 85 305. IT is the electrical connector for the dual capacity accelorator pump. It is only effective at certain temperatures and is controlled by a thermo swtich.

By the way, i love my TBI, haha..

[skippy969]

This is my first post, but I thought I would try to help to get this thread figured out correctly for anyone needing the same answer.

The first pic circled in GRAY with a green wire is the temperature sending unit to the das gauge.

The second pic circled in BLUE is an EGR vacuum soleniod. http://jcw.webepc.com/servlets/WebEP...e+Vac+Solenoid

The third pic circled in ORANGE is the engine knock sensor.

The fourth pic circled in RED is the dual capacity pump for a M4MED carb NON CCC

Circled in YELLOW is the idle stop solenoid. If its on a NON CCC carb it is connected to the AC to keep the engine idling when the AC is on.

Cirlcled In PURPLE is the temperature sensor that connects to the dual capacity pump to control the fuel flow when the engine is hot or cold.

The dual capacity pump and the mixture control solenoid are in the same place on the carb. The M4MED has dual capacity pump and the CCC carb has the mixture control solenoid.

Again this is my first post, but I was trying to get this thread a little more understandable for others.

EB