1992 Ranger 2WD 2.3L No Ground Pulse To Injectors

[mklickner]

8-Plug System, Great spark on all four cylinders, great pressure on the rail, power on both sides of injectors, no pulse from injectors. Have made sure the EEC relay was functioning properly.

I can spray ether into the intake and run the engine. If I manually ground the injectors, I can run the engine, but it floods the engine and pumps raw fuel into the oil and out of the exhaust. I need quick help. Im use to working on carbureted systems.

Note: This is a DIS system, not a TFI system.

 

[RonD]

On a distributorless system the Cam Position sensor(CPS) should run the injectors, well the PCM(computer) does the grounding but based on the CPS signal.
But I didn't think a failed CPS could cause a no start, I thought it would default to CKP sensor and stay in open loop, i.e. limp mode.

The CKP(crank position) sensor runs the spark(via PCM), and maybe the injectors if there is no CPS.

The PCM has a few ground points near it, some are circuit specific, I would think the injectors would be, so make sure all the grounds near the PCM are clean and tight.

 

[Earl43P]

The PCM grounds each injector bank.
Injectors 1 and 4 through Pin 58, 2 and 3 through pin 59.

The Ignition system of this era 2.3 uses the Crank Sensor two ways, CID and PIP:

Spark uses the PIP signal from Crank sensor pin 1 to ICM pin 4, called PIP IN. ICM outputs PIP Out on ICM pin 3 to PCM pin 56.

CID originates from Crank Sensor Pin 2 to ICM pin 2. That wire has a splice in it to share that CID signal directly to the PCM on Pin 5.

Verify continuity of that wiring to those 3 spots.
Verify continuity of wire from Crank Sensor Pin 3 to ICM pin 7 and PCM pin 16. All three points are labelled IGN ground. I suspect that wire is good if you have spark.

If all that rings out, try replacing the Crank Sensor, since it is the source of the CID signal used to time the injector pulses.

Later models used a separate Cam Sensor for injector pulse control. These older versions used the Crank sensor to do both jobs.

Welcome to The Ranger Station!

If you'd like copies of the 1993 schematics I am referring to, send me a PM with your e-mail address. To PM, click on my username <.

 

[mklickner]

From what I understand, if either sensors were not working, then i'd get no spark from either of my coil packs also. Im thinking its a bad ecm. To be honest, it ran fine a day ago, then just quit. I can get an ecm for $50, but its for a standard truck, not automatic. In my case, I dont think it matters. I believe the only difference is that it wont shift gears right. This is a derby truck, but, no wires have been cut, all grounds are grounded, and all connections are perfectly seated. I only need 2 gears, reverse and 1st

 

[alex881129]

Hello Guys.
I hope somebody can help me with my problem.
I have a 1993 Ford Ranger 2.3L 4 cylinders .
The problem is that when I try to start it, it will only crank but won't start.
If I spray Gasoline by the Air Filter area it will start and won't have any problems at all. I Could spend the whole day driving around perfectly. But any time I turn it off I have to spray gasoline again to be able to start it again.
I tested the injectors connectors with my multi meter and there is no voltage when it cranks.
I have read some forums where people says it could be the Crank Position Sensor , and I have read other that says that could be the Cam Shaft Position Sensor. My truck is "Federal" and I have also read that it doesn't have the Cam Shaft Position Sensor, only Crank Position sensor. (I don't know if that's correct)
It is supposed to be located under the Timing Belt Cover, but I am having troubles trying to get this cover off. I have took off the water pump pulley, the air compressor and I think I need to take the power steering bracket off too, But I can't find the third bolt that is holing it , I have tried to find pictures online but I still have no results.
Please if some body have had this kind of problems let me know how to get access to the crank position sensor, or how to remove that cover.
Thank you very much in advance.
Alex.

 

[RonD]

Could be a couple of things.
But not CKP(crank position) sensor, that disables spark and fuel, not just fuel, so would be a no start even with added fuel.

TPS(throttle position sensor) or it wires could have a short.
Unplug it's wire connector and try to start engine.

Computer has a "Clear Flooded Engine" routine
Turn key on
Press gas pedal to the floor, this turns off fuel injectors
Crank engine
This allows air to clear gasoline out of engine without new gas coming in, clear flooded engine.

If your TPS is shorted computer may think "gas pedal is on the floor" so shuts off injectors and a no start, if you add gas and engine starts computer will turn on injectors when rpms are above 400, and they will stay on.


Fuel pressure leak, either at fuel pump or Fuel pressure regulator(FPR) on fuel rail.
Ford computer will only run the fuel pump for 2 seconds when key is turned on, it won't start again until RPMs are above 400.

If you have no fuel pressure when starting then engine would of course not start, if you add fuel manually then RPMs go up and fuel pump starts and pressure comes back.

Try turning key on, count to 3 then turn key off, repeat this 3 or 4 times and see if engine starts.
Or check fuel pressure.