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Murf - 7 3L Diesel Question for ya
AV8R is on the right track.
Check each glow plug INDIVIDUALLY, if any are too high or low in resistance change them.
Another known problem is that when they get older the relay that powers the glow plugs gets weak and drops the power to them prematurely.
OK, leave alone the comment about getting older and going off prematurely.... ;->
Give me a little detail on cold starts, and especially the stalling part, there are a few other possibilities.
Best of luck.
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Murf - 7 3L Diesel Question for ya
Couple of things, based on more information.
First and foremost, load test each battery separately, this requires removing the wire on the one that goes through to the other. If one, or both batteries are low, replace it or them.
Next, test each glow plug, again independently of the others. If one or more are noticeably different on a digital Ohm meter, change it or them.
Next, if the current fuel filter is more than 6 months old, change it, drain the water seperator and give it a heavy dose of diesel additive, good stuff Power Service or equivalent. A healthy regular dose does wonders at the best of times. Water up next to the injectors will also create the symptoms you are describing until things warm up and melt the ice.
You mentioned that the place that changes your oil uses Rotella, but the problems you describe also could be caused by inferior or wrong grade oil. A PSD motor's injection system requires an oil with very high anti-foaming properties. This is why you can feel it with your right foot when the truck needs an oil change, viscosity and additives are the first elements to break down in an oil with use and age.
As for 16 mpg that doesn't sound right either. I would have to guess that your truck has a 4.10 rear end, there is no way the mileage should be that low with a 3.73 rear end.
Best of luck.
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Murf - 7 3L Diesel Question for ya
Hmmm, that doesn't sound right.
I forgot to ask, and it shouldn't make a difference at road speed, but is your truck an automatic or manual ?
My personal ride is a 1999 F-350 DRW Crew Cab 4X4 (see my picture # 19) and is heavily 'tweaked' and still squeezes off about 18'ish mpg around town and 21 or 22 on the highway.
I can't believe you'd be that far behind with a stock rig.
Best of luck.
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Murf - 7 3L Diesel Question for ya
The first few 'minor' mod's I did to mine actually improved my mileage.
When it got above about 350hp it went back down again.
But it's waaaaay more fun this way. hehehehe.
Best of luck.
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Murf - 7 3L Diesel Question for ya
The very first things done were;
a) get rid of the factory plumbing and install a 4" mandrel-bent system from end to end with a zero restriction muffler, and,
b) install a K & N air filter cartridge in the factory box.
These two little things alone made probably, as a seat of the pants estimate, a 50 hp boost and made the truck really wake up, the factory setup is too restrictive, both on air coming in and leaving.
Your fuel filter was certainly past it's prime, the dark colour is a combination of debris and algae, neither of which are good.
The dirt on the intake tube is indicative of two things, too much vacuum there, causing debris to either by-pass or go right through the factory air filter, and oil vapour being drawn up through the PCV system, again caused by too much vacuum. A high-quality permanent air filter element should solve that problem.
Best of luck.
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Murf - 7 3L Diesel Question for ya
In my own truck it gets washed out and re-oiled every other oil change, which is 10,000 kilometers, about 6,000 miles. In the fleet it gets done every 12,000 miles, but they do more miles in a shorter time and mostly highway at that.
If it is not kept very clean, yes, you will get either debris past or oil vapour up from the sump through the PCV.
Best of luck.
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Murf - 7 3L Diesel Question for ya
Ken, are you sure the filter had been properly oiled ?
The filter media in a K & N has much smaller openings than the factory paper one does. It would actually catch far more, not less.
Best of luck.
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Murf - 7 3L Diesel Question for ya
You want to see the look on their face when an 8,000 pound dually breaks free and passes them going down the road on a 45° angle blowing a cloud of black smoke from the tail-pipe and blue smoke from BOTH sides of the dual's.
It's almsot as funny as when you pull ahead of them at the lights and as you start to ease away from them they see there's a TRAILER behind you that's passing them also...
As for the rear-end, I'm not sure how you could 'blow' a seal, it is a vented diff. so unless there is a blockage in the vent it can't build any pressure.
It is more likely that at some point when you were off in the rough and got a piece of greenery wrapped up around it and it burned the seal up, it is a really common thing. I picked up a piece of fishing line on a launch ramp years ago and it got wound around the yoke and took the seal out on me.
Best of luck.
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Murf - 7 3L Diesel Question for ya
The exhaust was VERY simple to put on. The trickiest part is to get the connection at the turbo, it is way in the back. I had a friend help me but about all he did was hand me stuff so I didn't have to climb out from under the truck everytime I needed something.
As for cold weather starting, it was going to be VERY cold here this morning so I decided top try a little experiment. I unplugged the block heater, but left the battery blankets on and put a small, 1 amp trickle charger on the truck.
When I went out this morning for coffee with the boys the truck lit right up, it made some pretty horrendous noises for the first few minutes, but it did start alright.
At 7:30am it was -32° Celsius which is -26° Farenheit, when you include the wind chill factor they said it was about -45° Celsius or about -49° Farenheit.
I suspect it might have been different if not for the warm, fully charged batteries.
Best of luck.
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Murf - 7 3L Diesel Question for ya
I second taheide's comments on the rear seals.
Almost everyone I have ever seen weeps a little around the pinion, enough to dampen it that's all.
If you can find it loccally try adding some Lucas Gear Oil Supplement to the diff. next time you top it up, the stuff is VERY gooey but works miracles.
Best of luck.
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12-14-2004, 15:51 
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