Truck ran rough suddenly 2 years ago. Been parked until now. No fuel pressure when key is cycled 3 times as Schrader valve is pressed. Replaced fuel pump, and FPR. Still nothing. It runs decently but smokes like a train. That's due to a lot of fuel in oil. Drives like crap. No throttle response. Replaced oil and filter, new plugs, getting fire all the way around. As I checked plugs for spark, I noted that each time I pulled the plug from the passenger Bank of the engine it would run from semi smooth to really rough. But everything from the drivers Bank of the engine did not make a change as I pulled the plugs. So that tells me the problem is isolated to the driver side Bank of the engine. What else could be the problem? Bad ECU? Bad injectors? I just don't see all three injectors going out at once unless there's something that I'm not aware of. So if anybody could enlighten me to help would be greatly appreciated! Thank you

 

If you changed coil pack wires and plugs, maybe its an EGR valve!

 

So is that above the TPS on the intake? I thought that was a idle air control valve.... And would a bad EGR cause fuel to dump in one side of the engine?! Thanks

 

I mean, because if that affected the fuel, as in dumping it into the oil then why do people delete EGR valves on engines? Just a question

 

I'm not sure, the best thing to do is have it scanned with a OBD 11, to find out if any codes come up. Advance auto does it for free.

 

It's a 93. OBD2 did not come.out until 95. I know how to jump the jumper, but battery was out so long, codes were erased.

 

I believe they can read them with the obd 1

 

Unless there's some trick to that, I'm going to have to disagree. There is no OBD2 scanner that will fit this 93 Ford Ranger.

 

Like I stated before I know how to jump the connections with a wire but there are no codes stored because the battery has been dead for so long and I'm definitely not going to drive it around with gas in the oil. And I've already gone through one fresh oil change and less than 30 minutes just to have fresh fuel dumped into the oil about 3 gallons worth. Plus I don't want to damage the engine and blow out any seals by running it like that

 

. I'm a GM guy. I know how to read their codes. This is all over the place. Any takers?

 

What would cause this?

 

Fuel injectors get 12volts with Key ON
The computer GROUNDS the injector to open it

Depending in the year, Batch Fire or Sequential injection, one injector wire shorted to ground could open 3 injectors on a V6 engine.

There should be a RED wire on each injector, its the 12v wire

Test the other wire, on each injector, with OHM meter, key on, to make sure it is not Grounded

If you have 6 different colored Ground wires you have sequential fuel injection, if there are only 2 different color ground wires then you have Batch fire

 

So connect the positive lead to the "other" wire and ground to the battery? If it's working proper, I shouldn't hear an audible beep? Also, so what you're saying is if the driver side grounds are all one color and the passenger side grounds are another color than that will be batch firing?

 

All the leads to the injectors (6 of them) are all R/W...

 

Should be 2 wires at each injector

Red has 12v with key on

Ford did use a White wire for ground on some years, but only for 3 injectors
Other 3 should use Tan as Ground wire

 

So I tested the resistance of the injectors. All injectors fall within spec @ 15.5 ohms.
I then used a test light and tested wiring. With light connected to positive terminal on battery I probed all injector ground connections. Everyone of them pulse when engine is running. However, with key on the bad injector bank keeps the light on when probing grounds. Good bank doesn't light up. Disconnect the harness from ecu and light goes out on bad bank. I'm assuming this means the ecu is bad. Am I correct in my assumption?

 

Yes, good testing

Pop the top on the ECU, should look like this inside: Ford EEC-IV

You can see the 3 Blue Capacitors, these would leak after 20+ years and cause ECU problems, the failed capacitor and the leaking of chemicals onto the circuit board
Less than $5 to replace these and clean up the circuit board under them
May not be the problem but FREE to have a look

Repair info here: http://support.moates.net/capacitor-...-ford-a9l-ecm/

 

Just want to say thanks for your help. It was quite frustrating as the the problem seemed to have been fuel related and tossed a new fuel pump and fpr to solve the issue to no avail. No fuel pressure as the injectors were dumping the fuel instead of opening and closing. You were the only intelligent response in this thread. I will update when I either open the ecu to check capacitors or order a new ecu. This means alot to a friend. It's his brothers truck. His brother passed away from overdose.