KSB stuck

[BJMarshall]

My timing normally returns to normal after just a few minutes of running. This morning I think it was still advanced when I got to work after about 20 minutes of driving. It was a little colder than normal here (about 30f). The grid heater cycled normally, I never noticed the timing returning to normal, and I usually do. Can these things get stuck in the advanced position?

Barry

 

[cerberusiam]

Its an electric solenoid controled by an electric sensor, several things could go wrong in that system. Before buying those expensive things check you wires and connections and make sure they are good. Could just be time for a cleaning and greasing. The air temp sensor would be my first guess. You could pull it and make sure it is clean and looks good then go from there. Good luck.

 

[bgilbert]

I thought this myself, which is why I unplugged mine. Many guys with advanced timing unplug them, so as to not blow an o-ring or something when it advances it even more.

 

[Greenleaf]

Mine is unplugged as well. I do plug it in time to time when the engine is running. I never have heard a change in the sound of the engine. Perhaps mine does not work???



Don't care.



The internal pump psi is not a problem for a fresh pump or one that has been serviced. The problem is encountered with an older unit which exhibits dry o rings.



-S

 

[BJMarshall]

I drove it at lunch and it did fine. It had warmed up to about 50f. It functioned just as it normally does. It was advanced for just a minute or so and then it dropped to normal. I'll keep an eye on it and unplug it if it keeps acting weird.

 

[jaynes]

What are we talking about unplugging here. . ther ksb or the air temp sensor? I know the ksb advances the timing when it's cold. Mine takes along time as well when it's cold out. Just recently, it would never... uh, un-advance (?) the timing, and I found that to be the connection was loose, so I had to do alittle bending of the "female" connector's insides to make it fit properly.



When it's advanced, is the ksb energized or de-energized? When you unplug it, isn't it in a constant cold-advanced posistion? My pump itself is advanced, and has enough growl already, but when the cold advance is "on", my engine is freakin' loud! I can't even hear the turbo over it. Is this bad?



jaynes

 

[cerberusiam]

There are 2 temp sensors on the intake, one for the KSB and one for the heater grids. The feed for the KSB runs from the fuel solenoid to the temp sensor then back to KSB actuator. I think it is powered cold and unpowered warm but not positive. When its cold check the KSB with a test light and see if it is powered.



My truck definitely idles up when cold then down again when warm but there is not much change in engine noise. You may a bit far advanced if the KSB causes some significant rattle. If you haven't popped a head gasket yet its probably not an issue. My . 02

 

[JLEONARD]

I ASSUME that my KSB is working, but I have never done any test to prove it.

I do have a significant rattle when it's cold, but me thinks it would do that whether the KSB worked or not.

At any rate, truck starts and runs fine when cold, better when a little warmed up.

Started on it's own last year at -5 F and ran ok.

My asumption is all systems are OKEY-DOKEY.

 

[GBechtold]

Would this be the reason that some times my preheater cycles and some times it dosen't when it's cold out? Last winter I went to fire it up and the wait to start light came on but the preheater didn't click on the truck fired up but but missed for little bit and really smoked then ran fine.