I've got a '98 12v engine mated to a NV4500. The problem is "sometimes" I lose all power from the engine and immense amounts of black/white exhaust pours from the exhaust. This has only happened twice in the last six weeks. The first time the outside temp was about 40 degrees and I was doing approximately 60-65 and went to pass another truck on a straight away and the symptoms mentioned above happened. The other time was this afternoon; I was going through town at about 35 mph the outside temp was 13 degrees and she just bogged down on me. Both times the truck died but restarted after sitting for a minute. After the restart the idle was rough and I had to feather the throttle. Also, both times the problem eventually cleared and the truck ran fine with no problem. I've tried to describe as much as possible. Thanks for any help. :huh:
lbeenken
12-20-2004, 07:47 PM
I would start with the fuel filter. Sounds like your getting some but not enough. Make sure you put some additive in it too. I use Powerservice (white bottle) year round in mine. I wouldn't use the red bottle unless it is jelled. Truck really seems to like the red for some reason and sucks it down real quick. Make sure that you are getting good enough fuel so there is no water in it and it won't sludge up on you. Most places sell an "artic" fuel of some sort or you could mix #1 and #2 fuel together. If the problem is still there then I would probly get the injectors checked for flow and the pump for fuel pressure too.
PSiemens
12-20-2004, 09:11 PM
"Sometimes" problems are hard to diagnose especially over the net. You might have two or more issues to repair. Do you have gauges? They would help to diagnose. Is the truck stock or bombed? Is this a Calf. emissions truck?
The black smoke is a fuel and or air problem. It is doubtful that your air cleaner is clogged so fuel it is. I'd look for a pin hole or cracks in the AFC diaphragm. This is located at the back of the injection pump. Hint, follow the short little black boost signal line. There are 4 bolts that need to be removed. One is a breakaway. This cover is vertical. The diaphragm is round and made of a pinkish rubber-like material.
Have the fuel supply and fuel return lines every been changed? It just takes a bit of air to enter the fuel system to wreak havoc. Any other symptons? Is the truck hard to start?
Phil
RAMBCS
12-20-2004, 09:13 PM
Thanx for the reply. I've been using the white bottle of powerservice since the temps got below thirty-five. The fuel I've been getting is "supposed" to be winterized. The town fuels all their diesels from the same pump but not sure if that means anything. I'll start with the fuel filter. I'm not sure how to check the injectors or fuel pressure - any other suggestions would be greatly appreciated. Thanx again for your advice.
RAMBCS
12-20-2004, 09:28 PM
Phil,
The truck is not stock and is not a CA emissions equipped. It's putting out about 330hp and 750+ qt. I have pillar mounted boost and egt gages but no fuel pressure gage - is there one you recommend? The truck had been running like a raped ape just until recently. It's 15 degrees here and I have no shop so trouble shooting and maintenance is going to be a joy. The truck isn't hard to start at all. I plug it in each night and she fires right up.
Phil - another question I have is about a WTC light. The engine I have is dropped in a F350 that started its life as a gasser. I've been turning the key on for about 15 seconds and then giving it a go. Should I wire up some system for the future? Just curious. Thanx
PSiemens
12-20-2004, 10:05 PM
Are you referring to the Wait To Start, WTS? The WTS time varies. It comes on about 50*F. You can tell when the grid heaters are working by watching the volt gauge and the headlights when they are turned on and it is dark out. If you are controlling the grid heaters manually, 15 secs is long enough providing truck is plugged in. You will know by experience how long to turn on the heaters.
When the truck starts to blow out black smoke, what are the EGT and boost gauges reading? Does the EGT peg, steadily rise? Does boost pressure drop? A fuel pressure gauge is not a necessity on a 12v. The manual pump mandates use of an isolator in a permanent installation.
