white smoke off idle from a stop light. Some times?

B

burnin oil

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Need a little help on this one guys. About 60 percent of the time if the truck idles for a couple minutes I will get an enormous white cloud out the tail pipe when I come off the clutch for a few shifts then it cleans up. The usual culprit for this is a stop light or sitting in stopped traffic for a long period of time. The truck idles perfectly, making good power, burning pretty clean otherwise and getting decent MPG. Absolutley no idle haze, popping or sputtering. Fuel presure was set at 45 PSI at idle and was maintaining it while free reving. Oil and antifreeze look pretty good and I don't smell either. Temps make no difference alnd his happens on a warm motor. Not sure where to go from here. I bumped the timing (around 25* now) and this reduced the frequency but it is still doing it
This pump was a good pump and is my spare but it did sit for a few months. I pulled my good pump when I cammed the truck and sent it to Seth for maxing. I would like to figure out what is going on before switching pumps again. I have no idea when the issue started either because I had a bad injector for awhile the was dribbling alot. New SDX injectors are in so I would rule out injector issues. Just not sure where to go from here.
 
It was a little low (2 qts) but this is most likely due to draining the radiator when the motor was cammed. I had to fix an oil leak on the front cover and one on the water pump while I was in there about a month ago. Since I topped of the radiator it has stayed full for the last week and a couple hundred miles, not to mention idle time. I spend alot of time in traffic each morning. That was my initial thought also but there are no bubbles in the radiator, fluid mix, external leaks, or over preasurization of the cooling system.
 
Pump timing and injector spray angle can put the fuel spray on top of the piston. With 25* of timing I would imagine you should have thin injector washers and even then you may need to retard timing a few degrees to totally eliminate the haze.
 
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I had a similar issue (white smoke after idling) for several months and it turned out to be leaking valve seals. My #2 and #5 exhaust valve stems both had a nasty coating of baked on oil.
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Yes they are the thin washers. I bumped the timing up from around 17* to approx 25* and this reduced the frequency of the smoke problem. The about is because I just popped the gear and rotated the balancer about 3/4" instead of using the dial indicator this time around being it was just an experiment and only wanted to see how it ran which is good but just starting to hinder spool. This problem is just intermitant so I am at a total loss. The injectors are 5x14s with the correct spray angle and run perfectly clean when this odd condition isn't showing its evil head. light black haze at 5-10lbs boost under moderate throttle at lower RPMs (like rolling around a corner in a higher gear) then clear again unless you are WOT. About the only other idea I have left is to retorque the head studs this weekend. This thing will roll out the white smoke, when it does it, like starting the motor on a 10* day without using the grid heaters! Then all is fine. No popping, stumbling or ruff running:doh:
 
Fatty I hope not. The long block was rebuilt 23k miles ago. Then I had the head Oringed through Tim Barber at TRE when I put a little more boost to it. I almost wonder if a ring got lined up. Motor is smooth as glass though. Interesting line of thought there.
 
Yes it was 40-45 idle up to 2500 free rev. Been raining here but I will sneek the gauge back on tomorrow. Are you thinking the OFV? It was shimmed and bic pen modded a couple months ago. I jus remembered that I think I have a spare floating around I can switch out in the parking lot at work.
 
Free rev fuel pressure tells you very little if you're running a mechanical lift pump. Also bic pen springs are so 1900s. LOL Use the spring out of a core CP3 pump, the one that hold those little check balls in that everone looses when they install a bag of parts.
 
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Thats a slippery slope! I just got told the other day to swap out the VGT on the 5500 after it hung the exhaust brake over Thanksgiving. Now ya want me to up the fueling on that one also:woohoo:
 
put additive in your fuel if you don't already and see if it goes away, most of the time if you do not put additive in the fuel every couple tanks, the injectors will stick open alittle because of the low sulfur fuel dries them out. Not saying that is your problem but it will make your truck haze do to this.
 
Good thought. I will give here a healthy dose of Power Service tonight so maybe I will notice a difference on the way home. Driving about 50 miles a day right now. Usually dump Lucas in any of the diesels if they sart to idle a little ruff.
 
burnin oil said:
Thats a slippery slope! I just got told the other day to swap out the VGT on the 5500 after it hung the exhaust brake over Thanksgiving. Now ya want me to up the fueling on that one also:woohoo:
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You missed the point. Take a spring out of a junk CP3 and put it in your P7100 OFV. Do not ruin a good CP3.
 
Lee, I followed what you were saying and was just having fun.

I power serviced the heck out of the truck and the ride to work and home was uneventful. Went to dinner and she started dumping white smoke again. Looked like someone was using SeaFoam! Now I am getting an idle haze also. No strange smells and smooth idle too. 77* outside. I think that I am going to swap the pump Saturday and see if that is where the issue lies. I will also pull the charge tubing and see if I am throwing any oil out of the turbo seals. Didn't have time to play with the truck before dark so no fuel pressure readings.
 
Diehard Ram said:
Turbo oil seals bad???? Or maybe going bad. I have seen it before.
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You beat me too it. Ive seen them leak out of the exhaust side and you don't notice it until you idle. There isn't too much flow at idle so the smoke just lingers until you start moving.
 
So how would you check this? Pull the center cartridge and look for seeping behind the blades? I have got to get this thing figured out. Ironically it was 46 degrees this morning and she blew white for first 150' then clean sailing all the way to work. Even in traffic:bang
 
Pull the downpipe and see if its oily. Sometimes they have alot of caked on soot and its not oily.
 
The exhaust has always had some caked on mess but I will drop the downpipe tommorrow and check it out. Before I saw your response I dropped the cold pipe and it was clean. Both turbos were tight with clean blades. Strangely there was a light black oil film in the cold side outlet of the atmosphere turbo that did't appear to go past the aluminum housing. I cleaned the turbo out with a little brake cleaner so I can see if it does it again. Like I said everything past that point seems clean of residue. After I drove the truck to lunch I fired the motor up with no coldside pipes and didn't see any smoke coming from the turbo even after running for 5 minutes. I free revved it to 2k RPM and let idle also. No noticable oil film on my hand after covering the turbos discharge so I think it is probably OK.
 
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