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Dec 8, 2001 | 03:39 PM

tommy_rebel

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From: Wichita Falls

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I have spent several hours reading these forums and have found some great tips and advice. One thing I did not see addressed was a problem I have. I bought a '87 F250, 3/4ton, 6.9L, XLT Lariat in March, 2001. The only thing I've had to do to it is change the oil and put diesel in it. Three weeks ago I was driving down the highway, cruising about 70 when it died. No noise, no shaking, just died. Both fuel tanks were full, I depressed the valve above the fuel-filter while cranking it and diesel shot about a foot out in a steady stream so diesel getting to it. It wouldn't start up again. Someone told me my injector pump was out, then someone said the pump doesn't go out all the sudden, so maybe it's the injector pump switch? I had just put on a new Fram fuel-filter which my Father said to fill with Dexron-Mecron III transmission fluid. I'm not mechanically inclined on diesel engines so I did it. Could that have done it? It snowed about eight inches that night so I didn't mess with it but two days later I started it right up! It's ran fine ever since. Was it a one time occurence or is this common on the 6.9L?

Dec 8, 2001 | 06:14 PM

powerstroker250

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Did you fill the filter with tranny fluid before this happened? If so you had a filter full of tranny fluid and no fuel. By the way, don't put tranny fluid in your fuel. There are many good fuel additives designed for diesels. Tranny fluid leaves deposits in the cylinders and on the valves plus gets into the oil.

Les

Dec 8, 2001 | 06:19 PM

tommy_rebel

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From: Wichita Falls

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[updated:LAST EDITED ON 08-Dec-01 AT 07:19 PM (EST)]Yeah, I filled it with trans. fluid the day before it happened. My father said it cleans the injectors. What a dumba--.
Tommy

Dec 8, 2001 | 08:12 PM

The Diesel Dude

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From: Indianapolis

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There is a solenoid in the top cover of the injection pump that has to activate in order for the engine to run. The next time this happens, leave the key on and use a volt meter or 12 volt test light to determine if you have voltage at the wire (the one toward the front) that activates the solenoid. If you do, it means the solenoid is sticking (tap on the top of the pump with a screw driver handle and it may activate to get you going). If you don't, then it is an electrical problem and you'll have to trace that wire back to find the cause of the problem.

Dec 8, 2001 | 10:57 PM

0patience

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Let me start by saying...

powerstroke,
this information on the trans fluid is based on what?
Leaving deposits on the injectors? Not that I have seen.
Gets trans fluid into the oil? So what? It would be minimal at best.

I'd be checking the solenoid as was brought up. You may find it quit on you. Still wouldn't rule out the injection pump and yes, they will just up and quit. You'll have to see if the fuel pressure is up to specs, but you will also need to find out if the high pressure pump is working too. Confirm that your oil pressure is correct. If the oil pressure isn't right, the injectors won't fire.