Fuel injector Question

Reply Subscribe

Thread Tools

Search this Thread

Jan 5, 2006 | 05:34 PM

mechanicgurl

Thread Starter

New User

Joined: Jan 2006

Posts: 7

Likes: 0

Fuel injector Question

I have a 1990 Ford F-250 with a 5.8. I know that I'm getting power to the injectors, the nodes told me that. I want to get the injectors open and try to clean them out. What voltage do I need to get them open. Any suggestions on how to do that? Any and all help is appreciated.

Jan 5, 2006 | 05:42 PM

EPNCSU2006

Lead Driver

Joined: Nov 2002

Posts: 9,557

Likes: 44

From: Concord, NC

The injectors are supplied with 12V and they are grounded by the computer. All you need is 12V and a ground to open them.

Jan 5, 2006 | 05:52 PM

Bob Ayers

Postmaster

Joined: Jan 2003

Posts: 4,417

Likes: 3

From: Durham, NC

You may want to limit the current with a series resistor. The coils in the injectors aren't designed for 12V DC across them.

Jan 5, 2006 | 06:04 PM

mechanicgurl

Thread Starter

New User

Joined: Jan 2006

Posts: 7

Likes: 0

Thank you so very much.

That's what we needed to know.
I love the site.

If I need anything else, I will definately be back.
Have a great one!

Jan 5, 2006 | 10:59 PM

EPNCSU2006

Lead Driver

Joined: Nov 2002

Posts: 9,557

Likes: 44

From: Concord, NC

I don't see why they aren't, unless there is a resistor in the computer. They are fed 12V, but now that you say that, I'm curious if there is something in there...

Jan 6, 2006 | 05:04 AM

Bob Ayers

Postmaster

Joined: Jan 2003

Posts: 4,417

Likes: 3

From: Durham, NC

Quote:

Originally Posted by EPNCSU2006

I don't see why they aren't, unless there is a resistor in the computer. They are fed 12V, but now that you say that, I'm curious if there is something in there...

The injectors are always pulsed from the PCM, they never have a constant 12V across them.

Jan 6, 2006 | 06:43 AM

EPNCSU2006

Lead Driver

Joined: Nov 2002

Posts: 9,557

Likes: 44

From: Concord, NC

I know they are pulsed, but they are supplied with 12V from the wiring harness. I don't see why 12V would hurt to open them momentarily. I agree that they shouldn't be held open for a long time.