The Holley 6280 feed back 2 barrel carburetor, couple of questions.

J_HOLUBEK

MEMBER
1988 CHRYSLER FIFTH AVENUE
5.2L
V8
RWD
AUTOMATIC
130,000 MILES

So the car seems to run better with the carburetor's 4 pin electrical plug unplugged.

What is the actual function of the 6280's "mixture solenoid"?

What does the ground switch on the solenoid ground? What now is not grounded?

What is the computer now seeing with this connector not connected?

4 Replies

WRENCHTECH

MECHANIC
20,757 POSTS

The mixture solenoid controls the fuel mixture. The computer monitors an 0/2 sensor and pulse width modulates the solenoid to match engine needs.

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Sunday, April 27th, 2014 AT 5:32 AM

J_HOLUBEK

MEMBER
15 POSTS

Ok, so with the solenoid connected and the engine running shitty it must be going too lean?

With it unplugged, it defaults full rich right? So with it unplugged it is running better because it is being over fueled.

I was only getting about 10-11mpg out of the last two tanks of fuel. This things is definitely not up too snuff.

I think I will be ordering a 2280 and mechanical distributor.

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Sunday, April 27th, 2014 AT 5:59 PM

WRENCHTECH

MECHANIC
20,757 POSTS

I don't know where you are getting any of your logic from. None of it is accurate. As I stated, this is a computer operated system that can have failures anywhere. It needs some serious diagnosis.

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Sunday, April 27th, 2014 AT 6:06 PM

J_HOLUBEK