Join Date: Nov 2010
Feedback Score: 0 reviews
18 or 19% is a little high for the IPR duty cycle at idle. You should be down around 11% at idle. The higher numbers would lean to an issue, but it doesn't indicate where. The PCM is looking for a target RPM at idle, and increases the IPR duty% to achieve it. Leaking o-rings on the IPR could lead to the higher numbers, a sticky IPR needle, leaking injector o-rings, bad oil, the list can go on. You're going to have to do a few tests to start narrowing it down from system to components. The white smoke is unburnt diesel. That's easy enough. Why is a bit harder. If there is insufficient fuel in a cylinder, it won't explode because the A/F ratio is wrong. It will start to burn but the violent air currents will snuff it out and push it out the exhaust. A bad injector tip might put the correct amount of fuel in, but not atomize it, and again- no explosion.
First, ensure your oil is correct for the truck and within mileage. Make sure the air filter is clean, and you already looked at the fuel filter. Next, get the On-Demand-Tests performed, KOER, CCT, and injector buzz. These will help narrow it down to a particular system or cylinder as the problem.
99.5 PS CC 4x4 SRW ZF-6
Triple Pillar Gauges; Fuel pres, Pyro, Boost
AE, Alldatadiy, and half a clue
- AKA "The Big White Truck"
The first part to be thrown at these trucks should be a PSD compatible scanner
PM please. No Visitor Msg if you want a response anytime soon