Ksb problem??? Might need some help
11-12-2010, 06:10 PM
#1
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Ksb problem??? Might need some help
Hi everyone, I think i might have a problem with the ksb on my 92 w350. The other day i noticed that there wasnt any power getting to the ksb while the truck is cold or fully warmed up. I tested the what i believe to be the temp switch and there is power to the black wire and none to the white one. i hooked a temporary wire to the voltage reducer or whatever it is and powered the ksb. That lowered my idle rpm a little and made the engine sound really weird at higher rpms. Does that indicate a ksb problem? Im prety sure the temp switch is bad, but somthing still aint right here. Any input please. Thanks. P.S. Sory about the long writing, hope it aint to confusing. Thanks again.
11-12-2010, 06:16 PM
#2
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what do you consider "cold"?
you dont want power to the ksb all of the time by the way so if you have direct power to it, you remove that wire.
the idle and rpm sound indicate the ksb does work.
you dont want power to the ksb all of the time by the way so if you have direct power to it, you remove that wire.
the idle and rpm sound indicate the ksb does work.
11-12-2010, 09:07 PM
#3
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Meaning at cold start, not ran since the day before. Wire is removed, was just a test. From what i"ve read in the past, the ksb aint supposed to have power til engines at opperating temp, is that correct? My ksb is not getting power at all that i can tell. I just hooked the wire into the what looks like a voltage reducer thats on the side of the head. Also i unpluged the ksb and it dont run or sound any different than before. That means that the timing is fully advanced all the time if its unhooked, correct? Thanks for the reply.
11-12-2010, 10:17 PM
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The textbook answer is this: KSB is a kalt-start-beschleuniger. German for cold start accelerator. It takes a signal from a temperature sensor in the manifold to actuate a solenoid (may be an electric solenoid post-'92 or a thermal wax pre-92) which redirects fuel pressure into the injector pump. This increase in internal pressure in turn bumps your timing (5degrees?) to smooth out the chilly beast on those cold mornings. The temp sensor will cut power when manifold temp reaches 90 degrees F.
The KSB is located towards the bottom of the injector pump. 2" long x 3/4" cylinder, electrical terminal on one end, a fuel outlet in the middle.
Dodge lists them, it's a discontinued part but some dealers still have one on the shelf ($540 was my quote). Contact your local Bosch supplier and you'll save about $100, I think they were in the $400plus range. They wanted $110 simply for the electric solenoid.
The KSB is located towards the bottom of the injector pump. 2" long x 3/4" cylinder, electrical terminal on one end, a fuel outlet in the middle.
Dodge lists them, it's a discontinued part but some dealers still have one on the shelf ($540 was my quote). Contact your local Bosch supplier and you'll save about $100, I think they were in the $400plus range. They wanted $110 simply for the electric solenoid.
does this answer all of your questions? if not, keep asking.
11-13-2010, 09:22 AM
#5
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Yea, that helps alot. I read in cummins service manual says no power to ksb advances the timing. That must be for a different year. Heres what it says, "If the wiring is disconnected, the KSB remains activated and the injection pump timing is fully advanced." That would be the opposite of what mines supposed to do, right? So i guess the apparently just the temp switch is bad on mine. I'll put a new switch in and see what it does 
, THANKS
, THANKS
11-13-2010, 04:37 PM
#7
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You should have power to the KSB when the manifold temp is under 90 degrees. I agree that the switch is probably at fault. Tomorrow morning, before you start the truck, unplug the switch and check continuity across it. If it's open, replace the switch.
It sounds like the solenoid works, BTW.
It sounds like the solenoid works, BTW.
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11-23-2010, 07:33 PM
#9
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Would anyone happen to know a part number for a ksb temp switch? I could'nt find any usable numbers on the switch its self, im having to get one from a dealership and a part number would be really helpful helpful.
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