I had diesels run backwards before did it a couple of times when I was driving some Mack trucks and they literally run in reverse meaning they take air in from exhaust and puff out exhaust through air canister on the intake side so if truck just started exhaust pipe would be cold. But as far as a fix I dunno like stated above wiring problems maybe grounds

 

That and also if the rings are bad...

or if the seal on the injector pump and allow diesel into the crank case and thin out the oil, and then it and easily get past the rings and "Run Away"... The only way to shut them down is to cut off the air flow... and larger engines it's too dangerous to attempt blocking off the air flow... just wait for it to burn up...

This happened to my boss' twin in-line 10 cylinder diesels on his yacht... $500,000 later still waiting on the second engine to be replaced....

 

Hmmm, isn't a runaway diesel usually a two stroke thing, thus the reason for the emergency shutdown flap in between the blower and the intake? I have never seen a four stroke run in reverse, I have seen them compression lock then release compression by turning in reverse, but not run in reverse.

As others have stated look at the known wiring issue's.


Tim

 

Sounds like it all started when you ran out of fuel. Are you sure you put diesel fuel in and not gas? Put some fuel in a styrofoam cup if the cup melts in a few minutes you have contaminated fuel.

 

Well as far as I know that guy brought me Diesel. he only brought me a couple of gallons. I went back to the gas station and filled up. The truck still ran about a day and a half(~200 miles) after filling up and the it just died.


I checked the oil and there are no signs of fuel mixed with the oil.

I didnt get a chance to check the wiring last night. but I will do that today, and let you guys know if I find something.

 

Just checking back to see if you found anything out yet?

 

How long did it run backwards? I would be concerned that the oil pump would not supply any oil pressure/lube with the engine running backwards. Good luck.

 

...on a reverse-start. If the engine is running backwards, it's sucking air through the exhaust and spitting exhaust out the intake...thus, sticking your arm up the exhaust pipe is the same as plugging the intake of a regular-running engine. Still not sure how it got enough fuel to actually fire though.

 

Well I checked the wiring that goes in the PMC last night, but every thing looked fine.

the engine ran backwards about 7 to 10 seconds.

Could it be a problem with the injectors or the CP3?

 

1. This seems like an electrical issue, not a physical mechanical problem. It may be coincidence that you ran out of fuel around the same time your truck had an electrical problem. Don't assume the running out of fuel caused the problem, look at them first as isolated incidents.

2. ECM/PCM power intermittent would cause all sorts of erratic operation, may even make the injectors fire at the wrong time thus giving white smoke (white smoke = unburnt raw fuel out the tail pipe). It may have even cause the computer to think your cam/crank sensor was faulty.

3. I have seen fuse conductors crack and one cannot tell that they are discontinuous/intermittent. To be on the safe side replace the any and all fuses associated with the ECM/PCM circuits, each fuse is probably a 25 cent part, you can't really loose here if you just replace 3 or 4 of them.

4. If you need the wiring diagram they are availble from dodges website, or you can PM me and I'll send you the .pdf files for the dodge ram wiring.

5. The loud knocking while cranking fits with the injectors firing at the wrong time and possibly a cause for running the motor backwards. If the injector(s) fire too early the engine could stop turning forward and be forced backward, thus your backward rotation and "arm-in-tailpipe" episode, you do have to admit that is a bit funny , or admit it later after the problem is fixed.

6. I would also check to see if the cam sensor power circuit has anything to do with the ECM power circuit. Both codes could have been caused by a fault on a common power circuit or two wires form each circuit shorting together.

7. Don't worry about the batt temp code, that is a common nuisance problem and is virtually guaranteed not to be related to the problems you are having, so discount that code now and concentrate on the other issues.

Keep in mind 9 times out of 10 when there is a tough problem that causes erroneous operation it is a wiring problem. I would focus heavily on the wiring having a short or two circuits shorting to one-another.

The more I analyze it the more it leads me to believe there is a problem with the ECM and/or ECM wiring. If you can get chrysler to swap an ECM in to the truck for no cost as a test trial try that.

If your electrically inclined I'd check the power circuits to the ECM/PCM for proper voltage and possible shorts before I try the new computer. You may even be able to source one on e-bay or through a local wrecker.

Good luck hope this helps weed through the wiring nightmare! PM me if you want to discuss this over the phone.

Eric

 

... also refer to this post (has same issues as you and found and fixed the shorted wire!)

https://www.dieseltruckresource.com/...ad.php?t=81936

 

Hmmmm......post looks familiar!

 

Ya. Don't listen to the guy that posted that thread originally. He's full of it.

On a side note. I think it may be easier to get to that wire for the repair if you take the oil filter off. I'm going to check mine again.

So,,,have you checked for the shorted wire by the A/C compressor

 

eastmentCTD600 I will PM you.

Checked the wires and everything looks fine. But im going to double check again.

 

Whatever happened with this? I am real curious to know what the cause of the problem was.