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| Non starting/ high pressure pump ??; Diagnostics by local iveco dealer | |
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| Tweet Topic Started: May 9 2013, 02:18 AM (1,556 Views) | |
| busta | May 9 2013, 02:18 AM Post #1 |
Newbie
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Hi I have a cab chassis 8140 .4.3s . Bought it with a dud turbo . Sat for two years finally fitted the turbo , runs and drives fine . The exception is it won't start even after prolonged cranking . Easy start down the cold start injector hole is the only way . This applies even when restarting directly after it has been running for some time . It revs freely and drives fine as I've said , so the local Iveco dealer here in Perth Australia has diagnosed the high pressure pump, if the pump was U/S wouldn,t it run out of fuel under prolonged high revs (which it doesn't)? replacing the pump is quite a job and expensive so I would prefer to be sure before taking that route . I know nothing about Ivecos , but rationaly it seems like a fuel bleed back problem only the problem exists straight away after having it running. Any ideas and or sources besides the dealer for the pump if it comes down to that. They initially charged $830 to diagnose the problem after ignoring our list of things we had already checked . we were after an electronic diagnosis and as the problem is every time u try to start it I thought it would bring a code up. |
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| Bazil-S | May 9 2013, 05:59 PM Post #2 |
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Hi, The defect is too low fuel pressure. These engines needs some fuel pressure in order to start. There are two possibilities: the fuel pump can not create enough pressure, or the pressure can not be maintained in the system. If the fuel pump is worn, then the engine will not work properly at any regime, especially in high torque mode. The low fuel pressure is created by the fuel supply pump and adjusted by the low pressure regulator located on the top of the fuel filter (mechanical governor). From here the fuel is picked up by the high pressure pump and the fuel pressure is adjusted by the pressure regulator, located on the pump body, facing backwards. The pressure regulator is electric and controlled by EDC (engine ECU). The pressure created by the pump is supplied to all injectors via a common rail (actually a kind of pipe). Inside the injector the fuel pressure is evenly applied on the needle ends, of the injection nozzle. In this case the injector needle will stand still in closed position. The injector solenoid acts on a valve that will drop the fuel pressure from the upper head of the needle to the fuel return pipe. In this case, the pressure in the lower end of the needle will be greater and will raise the needle, allowing the fuel to be injected through the nozzle. This valve, inside the injector, it wears out over time and will not close properly, allowing the fuel pressure to drop to the return all the time. During starting the engine speed is low and the fuel pressure can not reach the required threshold, due the pressure loss to injectors. Once the engine starts, the pressure losses are compensated by the pressure created by the pump at a higher (idle) engine speed. So before replacing the high pressure pump, do a fuel return flow test to injectors. For this you need a test kit, or read this: http://ivecoforums.com/topic/8867060/1/#new |
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| busta | May 9 2013, 06:13 PM Post #3 |
Newbie
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Hey Brazil your're the Man ! This truck has 230 ks on it and one would have to suspect at least some injector wear . I reckon yr on to it . The high pressure diagnosis by the dealer didn,t make rational sense because under load its fine , where as u would expect it to at least run lean or perform poorly under this situation . After reading your post if I took a gamble on injectors I reckon that would nail it as opposed to the pump , which undoubtably given the kilometres would have some wear but I feel would not provide these symptoms ! cheers ... Buy ya a beer when you come to Oz for a break from IVECOs !
Edited by busta, May 9 2013, 08:08 PM.
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| cieranc | May 12 2013, 10:04 PM Post #4 |
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I'd also get the crank angle sensor scoped, to see if it's kicking a signal out. We've seen these same symptoms from a failed crank sensor. The ECU has 2 reference points for the injection timing: The crank sensor and the cam sensor. When spinning over on the starter motor, the engine isn't turning fast enough for the cam sensor to get a useable signal. But once the engine is running the cam signal is sufficient to run the injection. So when the crank sensor fails, the ECU relies on the cam sensor, but the engine won't start because it's not turning fast enough to use the cam sensor. Give it a squirt of aerosol to speed the engine up, the cam sensor generates the required signal and the engine runs. Edited by cieranc, May 12 2013, 10:14 PM.
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| howes@myconnection.co.za | Jul 23 2013, 12:16 PM Post #5 |
Newbie
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I have a iveco turbo daily 50c13.Where is the fuse thst controls the fuel pressure regulator on the high pressure pump |
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| Bazil-S | Jul 23 2013, 07:34 PM Post #6 |
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Hi, howes@myconnection.co.za: Being a regulator, it does not have a fuse... it is driven by an electronic unit. |
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