Injection pump leak test cm2250 - Printable Version +- Rawze.com: Rawze's ISX Technical Discussion and more (http://rawze.com/forums) +-- Forum: Big Truck Technical Discussion... (/forumdisplay.php?fid=1) +--- Forum: ISX Related Help (/forumdisplay.php?fid=68) +--- Thread: Injection pump leak test cm2250 (/showthread.php?tid=8867) Pages: 1 2 |
RE: Injection pump leak test cm2250 - Rockinbexpress - 04-23-2023 [attachment=8888] pressure keeps dropping below commanded then ramps up and pump sounds like crap when it does it. Pressure drop was 960 in a minute ill re torque and check again today mpgs are down, power is down pump was installed 8/1/22 RE: Injection pump leak test cm2250 - Rawze - 04-23-2023 (04-23-2023 )Rockinbexpress Wrote: pressure keeps dropping below commanded then ramps up and pump and... (04-23-2023 )Rockinbexpress Wrote: ... In the meantime graph your commanded and measured fuel pressure and see if your measured falls below your commanded. Like the pic I attached. That is exactly what it is supposed to do within a given allowance .. that means nothing much whatsoever. here is why: http://rawze.com/forums/showthread.php?tid=8719&pid=75536#pid75536 RE: Injection pump leak test cm2250 - Rockinbexpress - 04-24-2023 (04-23-2023 )Rawze Wrote:What is within reason? That's the question. How many psi should it droop below commanded pressure?(04-23-2023 )Rockinbexpress Wrote: pressure keeps dropping below commanded then ramps up and pump RE: Injection pump leak test cm2250 - Rawze - 04-24-2023 (04-24-2023 )Rockinbexpress Wrote: .. That is set in the programming and the allowance is set differently for various tier engines. here are just a few of these settings that are related to your question ... *_APC_hp_BankDevThreshold {individual cylinder bank deviation allowance} *_APC_hp_ImaTrimEnTol {steady state tolerance} *_APC_hp_MaxErrorDev {above/below target pressure tolerance} *_APC_hp_MdvControlTol {undershoot tolerance} *_QTD_hp_MaxInjPressDrop {Max allowed drop in pressure for one injector firing event before a bad injector is detected} ============= Basicaly, if your engine was going out of its allowed tolerance, then it would be throwing a fuel pressure or other related fault of some sort. |