Engine not starting,Ranger'99,v6,3L,5speed

Reply Subscribe

Thread Tools

Search this Thread

Nov 24, 2004 | 05:53 PM

davedawe

Thread Starter

Freshman User

Joined: Feb 2004

Posts: 26

Likes: 0

Engine not starting,Ranger'99,v6,3L,5speed

Fuel pressure OK
Spark OK
No pulses to fuel injectors????
help
Thanks

Nov 24, 2004 | 06:30 PM

CowboyBilly9Mile

Post Fiend

Joined: Feb 2003

Posts: 6,940

Likes: 2

From: Eastern WA

Have you pulled codes yet (KOEO)?

Nov 24, 2004 | 06:36 PM

davedawe

Thread Starter

Freshman User

Joined: Feb 2004

Posts: 26

Likes: 0

My friend is working on the ranger using his code reader.

Should the reader tell you why or reason for no pulses to injectors???

Thanks for reply

Nov 24, 2004 | 07:06 PM

CowboyBilly9Mile

Post Fiend

Joined: Feb 2003

Posts: 6,940

Likes: 2

From: Eastern WA

Quote:

Originally Posted by davedawe

My friend is working on the ranger using his code reader.

Should the reader tell you why or reason for no pulses to injectors???

Thanks for reply

Hopefully it will show a failed component; I can guess a few but don't wish to speculate. That's what the test will do.

I'm not exactly sure where the voltage for the injectors comes from; it may be good to check for any bad fuses.

Last edited by CowboyBilly9Mile; Nov 24, 2004 at 07:08 PM.

Nov 26, 2004 | 10:13 AM

Rockledge

Post Fiend

Joined: Jan 2003

Posts: 9,748

Likes: 16

From: Connecticut

The fuel inejctors are live ("electrically hot") all the time with battery power. After considering input from a variety of sensors and computing the best time and duration to operate a particular injector, the PCM supplies a ground which completes the circuit and results in the firing of the injector.

No pulse to all the injectors sounds like a common power problem (red wires are power, which originate from the PCM power relay).

Dec 2, 2004 | 07:20 AM

davedawe

Thread Starter

Freshman User

Joined: Feb 2004

Posts: 26

Likes: 0

No start

Thanks for info

What would happen if I applied +12 volts to fuel injectors by passing PCM module???

Dec 2, 2004 | 07:25 AM

Rockledge

Post Fiend

Joined: Jan 2003

Posts: 9,748

Likes: 16

From: Connecticut

Quote:

Originally Posted by davedawe

Thanks for info

What would happen if I applied +12 volts to fuel injectors by passing PCM module???

Why do you want to do that?

Trending Topics

Bad trouble with axle shaft snap ring

33

464
This is prolly a 1 page thread at most

110.2k

6M
Truck slump

23

724
7.3 Gasser: $63 Air Filter?!!

17

577
Shocks for 2024 F250

46

3.0k

Dec 2, 2004 | 07:43 AM

MSRanger

Mountain Pass

Joined: Aug 2003

Posts: 108

Likes: 2

Quote:

Originally Posted by davedawe

Thanks for info

What would happen if I applied +12 volts to fuel injectors by passing PCM module???

Better you should check to see if there's voltage there already, rather then just adding some.

If you don't know with good confidence what you're doing, electrically speaking, I wouldn't recommend feeding voltage to things to see what happens. Figure out what voltage is missing, and reapply it the right way (fuse, pinched/shorted wire, etc). Get a manual, or a friend who's electrically knowledgable.

If you just start jumping wires around, you might find "Oh, that's it, I need a new PCM. Mine's fried."
Well, it might not have been when you started...

Not a knock on you. Just learned the hard way, years ago.