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ntc350 bc cummins no power in high gears?

Discussion in 'Trucks [ Eighteen Wheelers ]' started by flc120, Dec 18, 2014.

Page 5 of 9
  1. Jan 3, 2015 #41
    flc120

    flc120 Heavy Load Member

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    Jul 11, 2012
    Miami,FL (yeah i know :( )
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    thanks for chiming in guys. the overhead i have not done yet, i was under the impression that the overhead usually shows signs of being needed if truck is burning excessive smoke at idle white,or black or if it had a miss?? or can the truck still.idle fine and still need an overhead done?

    smokincat thanks for info.on solenoid i figured that much didnt think it had crap to do with flow. on the stc i thought that only came one the 444 series engines? this is just an old school bc350, or am i wrong on this.

    i deleted the small cone looking mesh that was in line on one of the radiattor hoses it was all clogged up, i deleted it. going to take her for a spin a bit better. i also installed new aftercooler to turbo silicone couplers as the old ones were bad looking
     
    flc120, Jan 3, 2015
    flc120, Jan 3, 2015
    #41
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  3. Jan 3, 2015 #42
    SmokinCAT

    SmokinCAT Road Train Member

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    Engine serial number and I could confirm, was there a line from fuel pump that went to square block on the side of engine block, it would be odd to be that new of a truck and not have an STC engine.
     
    SmokinCAT, Jan 3, 2015
    SmokinCAT, Jan 3, 2015
    #42
  4. Jan 3, 2015 #43
    flc120

    flc120 Heavy Load Member

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    were is this stc valve guys? is it the line that gets the boost reference from the intake manfiofd?i even changed the square type oring it has on the line going into the pump and still runs and drives the same way as before the pump if so, yes it has one and secondly the pump was rebuilt why would that have not been changed? besides the fact the pump is bench tested, these guys do have a fuel lab and all?
     
    flc120, Jan 3, 2015
    flc120, Jan 3, 2015
    #43
  5. Jan 3, 2015 #44
    SmokinCAT

    SmokinCAT Road Train Member

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    Hillsboro, OH./ Adrian, MI
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    Should look something like this if it has one.
     

    Attached Files:

    SmokinCAT, Jan 3, 2015
    SmokinCAT, Jan 3, 2015
    #44
  7. Jan 3, 2015 #45
    pup

    pup Light Load Member

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    Dec 3, 2011
    n.h.
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    A 350bc would not have a step time control system. 365 & up used that. On the bc engine the stc valve signal line would come off the shut down solenoid. #4 aeroquip hose. To troubleshoot this problem further you need a fuel pressure guage on the shut down solenoid & a boost pressure guage on the aftercooler. Take it for a ride & compare the fuel & boost pressure to spec. The pump shop should be able to look those values up using the fuel code on the pump.
     
    pup, Jan 3, 2015
    pup, Jan 3, 2015
    #45
  8. Jan 4, 2015 #46
    Stone Express

    Stone Express Medium Load Member

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    Has the cam shaft timing been messed with? I once drove a 300 that pulled very well, as it gave 350s fits as yours did, until Cummins changed only the camshaft under warranty, and it lost at least 30 hp. Never again pulled the same.
     
    Stone Express, Jan 4, 2015
    Stone Express, Jan 4, 2015
    #46
  9. Jan 4, 2015 #47
    flc120

    flc120 Heavy Load Member

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    Jul 11, 2012
    Miami,FL (yeah i know :( )
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    at least in the time ive owned it no....i havent messed with any timing whatsoever only fuel. i want to.install a boost guage on it atl east to see how its boosting.


    on furl pressure whats the max psi the fuel will go up to so i can find a guage
     
    flc120, Jan 4, 2015
    flc120, Jan 4, 2015
    #47
  10. Jan 4, 2015 #48
    SmokinCAT

    SmokinCAT Road Train Member

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    Hillsboro, OH./ Adrian, MI
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    300 psi should be plenty to cover a road truck.
     
    SmokinCAT, Jan 4, 2015
    SmokinCAT, Jan 4, 2015
    #48
  11. Jan 5, 2015 #49
    BoxCarKidd

    BoxCarKidd Road Train Member

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    Aug 26, 2014
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    A lot of good info on this problem, I have frequently cost myself a lot of time and money by rushing in & now try more than ever to follow a logical least cost & labor first procedure. Please excuse some repetition but this is where I would start. Are you sure the clutch is not slipping under high load? Throttle shaft: full rotation at WOT (wide open throttle) plus 1/4"brake over of spring loaded throttle shaft. AFC (air fuel control) will not allow the pump to supply full fuel intell it receives sufficient turbo boost. That should be notable by the beginning of shake rattle and roll at aprox. 1500 RPM. Any loss of boost pressure can prevent this. Bad diaphragm in pump, grommet on AFC line above diaphragm, broken clamp on or pin hole in hoses between turbo and aftercooler, gaskets etc. Check fuel pressure under load. Adj. valves & inj. remove inj adj screws flip rockers over pull inj plungers out & visually inspect for scoring,one at a time. Exhaust and intake restrictions a good point! If its a STC hybrid it will have a braided oil line on top right side of rocker boxes. Turbo turns freely no scrubbing.
     
    BoxCarKidd, Jan 5, 2015
    BoxCarKidd, Jan 5, 2015
    #49
  12. Jan 6, 2015 #50
    haycarter

    haycarter Road Train Member

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    The OP's truck is a '90 Build.
    If the Engine is Original?
    It would HAVE to be a STC engine.. (imho)

    When those STC engines First came out they were available as either 365/400 Or 444.
    Bur later on they were available in "Fleet" spec at 350 or 400 hp..
    But more than happy to be corrected...
     
    haycarter, Jan 6, 2015
    haycarter, Jan 6, 2015
    #50
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