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Old 09-24-2018, 10:55 AM
Blurrat120mph Blurrat120mph is offline
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Default 1993 XLT 4.0 Running on 3 cylinders, need help please.

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.
Also, I've confirmed that all three drivers side bank of injectors are stuck open. Cannot locate any ground shorts in harness.
Throwing a 512 code. Not sure if that's because the battery has been dead for so long.
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Old 09-25-2018, 12:01 AM
Undrstm8ed Undrstm8ed is offline
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Default Re: 1993 XLT 4.0 Running on 3 cylinders, need help please.

Quote:
Originally Posted by Blurrat120mph View Post
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.
Also, I've confirmed that all three drivers side bank of injectors are stuck open. Cannot locate any ground shorts in harness.
Throwing a 512 code. Not sure if that's because the battery has been dead for so long.
Do you hear the fuel pump prime up? If no, did you check the relay?

How did you check for spark? What color was it? Have you already replaced the coil pack?

You may need to throw a charger or a new battery in there to figure this out better.
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