smoke

[DPKetchum]

Hey guys,after installing new injectors was curious why only at times at idle it smokes and at times on wot it hazes?Why not consistent?First time I noticed smoke was stuck in traffic at idle. Try to make it smoke,extended idle in drive i could'nt duplicate!Also after injector change idle went down slightly. Only pump changes that have been done is about a 3/4 turn on power screw a long time ago and after injector change the high rpm screw 3 turns. Truck runs great from idle all threw rpm range.

 

[formula]

I had the same things happen when I installed my injectors. Had me wondering what was going on too. Here's what I found to explain the situation:



The reduction in idle is probably due to the larger nozzles, different spray pattern, etc. not operating quite so efficiently when flowing small (idle) amounts of fuel. This also increases idle smoke, which can be reduced or even eliminated by advancing the timing. The intermittent idle smoke is most likely caused by the KSB which advances the timing at idle, by way of increasing the internal pump pressure, depending on the intake air temp. So, if you run the truck down the highway and then stop and check idle smoke it'll probably be very little. This is because the cool air coming from the intercooler has cooled off the intake manifold and the KSB temp switch which will turn on the KSB and advance idle timing. If the truck sits with the engine off for a few minutes, the heat from the engine will warm up the intake manifold and the KSB temp switch, turning off the KSB and retarding the idle timing and making more smoke. You can check this by idling the engine when it's all warmed up, if it smokes, jumper the KSB solenoid to the battery +terminal and see if the smoke is reduced. You should also hear a change in engine sound and a slight increase in rpm. Also, if it's idling with no smoke, try unplugging the KSB wire and watch for the opposite effect. As far as the WOT smoke, I've noticed that I get more smoke if the engine is not fully warmed up or if the ambient air temp is below 40 degrees or so.

Hope this helps a bit,



Sean

 

[DPKetchum]

Ok I understand!Forgot to mentioned way back when power screw turned up slightly A tech at work did adjust pump timing to specs Banks gave us for a automatic truck. Before injector change other then cold start slightly and a puff on hot restart it never smoked at all. The other day it smoked at idle in traffic was after having lunch and getting stuck in traffic withen a mile of leaving. It brothered me some becuse all of a sudden i noticed diesel smoke blowing around truck and i was only diesel stuck in two lanes of traffic. It runs great and pulls strong high gear from 50mph to 90 makes me want to hunt up strokes and duras and see what happens!It was like going from a 305 2barrel to a good running 350 four barrel. Really woke it up.

 

[formula]

At least you got some information out of banks regarding the pump adjustments. You probably know of this already, but if not, http://www.dodgeram.org has a great description of VE pump adjustments. Also, if you look up BushWakr in the readers' rigs, he's got some nice pump picturesOo.



Sean