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tector 75e17 engine misfire
Topic Started: Jan 22 2013, 07:28 PM (5,460 Views)
yamriam
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HI , I Have a tector engine in an iveco 2001 75E17. On driving home the other night the engine went down from 4 cylinders to 3 and now sounds like it is running on two, so it is hard to start but does start. i have put new fuel filters on and basically the common rail appears to be full of diesel and under pressure. Cylinders one and four appear to be firing, but no diesel appears to be coming out of the valves on two and three (these are the valves that fit between the common rail and the injector feed pipes that go to the tubes) when we had it running the other day on two cylinders, we actually took the two feed pipes off and it made no difference at all, it carried on running and no diesel came out of either, there is def not blockage in the common rail as we have stripped it and checked it. But if we swap the valves from cylinders one and four to two and three the problem remains on cylinders two and three ! does anyone know what these little valves do ? when i take them out i can just about blow through them (50 and asthmatic!) and yet the diesel doesnt seem to come through them at all !! any help would be greatly received, it is stumping us......
thanks pete
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aidan
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Hi

the valves in the rail are doing there JOB ! which is to prevent high pressure fuel escaping (and associated risks) if a pipe is loosened or fractures.

PLEASE BE AWARE THAT FUEL RELEASED FROM A COMMON RAIL UNDER PRESSURE CAN KILL YOU. Do not work on this unless you have a understanding of the system & risks involved

Appropriate testing needs to be carried out to determine the fault, start with check on fault codes+ live data check and then suggest check on injector current / voltage with scope. injector leak off test on the head gallery is also worth while. Possible compression issue i.e gasket between 2 & 3.

Cheers Aidan
Edited by aidan, Jan 23 2013, 10:42 PM.
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seth
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The engine is an isbe cummins with ivecos own take on the ECM.The valves are known as transfere tubes.I dont understand how you can check them in the engine because the other end screws in to a taper on the injector body.the problems i come across are(agent for cummins)transferes tubes loose in the head,resulting in feed and return mixing and lack of fuel pressure.Injectors with excess static leak back.Low pressure pumps pulling air in after about 30 seconds of running and refusing to restart.High pressure pump shearing the drive shaft.By undoing the fuel pipes on the middle cylinders which is as said extremly dangerous the engine should cut out due to lack of fuel pressure.
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