jjsbc Posted July 11, 2021 Share Posted July 11, 2021 Hi I have swift kontiki 2007 it has always been slow to crank from cold but will start (6/8 seconds) if I stop it within the same time and restart it cranks just as slow but fires almost immediately anyone know about the system? I think the system may have a lift pump feeding a high pressure pump to feed the common rail. My question is does it have a check valve or system to retain the rail pressure as it seems the initial time taken to start could be the high pressure pump having to build the rail pressure,if I stop and restart the rail pressure is good and the injectors fire almost immediately,it's a bit tech but I am sure someone may be able to give me some info. Thanks. Link to comment Share on other sites More sharing options...
Alanb Posted July 11, 2021 Share Posted July 11, 2021 Hi, A diesel engine in good mechanical condition requires three things in order for it to start. 1. A good air supply. 2. A supply of fuel. 3. A minimum cranking speed of about 150rpm. In addition indirect injection engines, and multijet direct injection engines, benefit from the assistance of glow plugs, particularly when starting from cold. As you have mentioned a slow cranking speed, it may help to investigate that first.. Have you replaced the engine block earth strap, which seeme to be a weak point on x250 vehicles? Is the starter battery in good condition? (When selecting a starter battery, choose one with a high CCA rating.) For background information on the fuel system, please see the attached pdf file, which relates to the Iveco 2.8 JTD, The principal difference for the multijet is the use of piezo injectors, instead of the electromagnetic injectors used in JTD engines. Also more generally, the fuel lift pump, and pre filter, are inserted intothe top of the fuel tank, together with the fuel gauge sender. Alan2.8JTD p118 Injection Overview.pdf Link to comment Share on other sites More sharing options...
Gman Posted July 11, 2021 Share Posted July 11, 2021 I had the same problem, turned out to be the other earth lead that you can't see, the one in the battery box, terminal nearly corroded off. New lead fixed it. Hope this helps. Steve. Link to comment Share on other sites More sharing options...
mikefitz Posted July 11, 2021 Share Posted July 11, 2021 If the problem persists having checked/replaced the negative return braid links, chassis to gearbox, battery negative to body, and replacing the fuel filter, then have a injector 'bleed off test' carried out by a specialist. Its probable that one or more of the injectors have failed. With a 2007 vehicle, unless the chassis to gearbox 'earth strap' has been changed at some time it will be a contributor to slow cranking. Mike Link to comment Share on other sites More sharing options...
Alanb Posted July 11, 2021 Share Posted July 11, 2021 Gman, A good suggestion, as I have an x244 Ducato, with the starter battery in the engine compartment, I do not have to burrow under the floor to look at it! Mike, Would not a failed injector manifest itself with rough running of the engine? Having given more thought to this problem, it seems probable that on a failed start attempt, the cylinders are charged with unburnt fuel. The subsequent successful attempt may benefit from this excess fuel. Another obscure cause of difficult starting can be the camshaft or stroke sensor, which is only used during starting, but a problem with this would affect all starts. Alan Link to comment Share on other sites More sharing options...
mikefitz Posted July 11, 2021 Share Posted July 11, 2021 Alanb - 2021-07-11 12:59 PM Mike, Would not a failed injector manifest itself with rough running of the engine? Alan A common injector failure allows fuel to 'leak' within the injector via the leak off pipes back to the tank . Normally there is a small amount of fuel that 'leaks', but as the injector ages this may increase to an extent where the rail pressure falls to a low value. The control electronics inhibits a start until a target pressure is reached so no actual injection takes place. Prolonged cranking gradually increases rail pressure, when the target pressure is reached the injection is allowed and hopefully a start occurs. With a hot engine cranking is faster so the effect is less noticeable. A real time diagnostic system could capture rail pressures and injector timing to aid diagnosing the issue. Evaluating and correcting possible electrical issued causing slow or protracted cranking is a useful first step given the age of the vehicle. Mike Link to comment Share on other sites More sharing options...
Gman Posted July 11, 2021 Share Posted July 11, 2021 There you go. Ahh still can't post photos compressed to 85 thingies. no pic of corroded lead!!!! won't try again. Link to comment Share on other sites More sharing options...
Alanb Posted July 11, 2021 Share Posted July 11, 2021 Gman - 2021-07-11 2:16 PM There you go. Ahh still can't post photos compressed to 85 thingies. no pic of corroded lead!!!! won't try again. Gman, See this thread. Alan Link to comment Share on other sites More sharing options...
Gman Posted July 11, 2021 Share Posted July 11, 2021 Thank you, As I am a member of various free forums and not one has a file size limit for photos. The forum "owners" could try a bit harder to remove this small limit, until then I won't try to post anymore photos, A picture paints a thousand words, to those who may not understand the wording. Steve. Link to comment Share on other sites More sharing options...
jjsbc Posted July 11, 2021 Author Share Posted July 11, 2021 thanks Allan all good exept crank speed ran earth lead direct from battery made little difference. Link to comment Share on other sites More sharing options...
Derek Uzzell Posted July 12, 2021 Share Posted July 12, 2021 Gman - 2021-07-11 5:16 PM Thank you, As I am a member of various free forums and not one has a file size limit for photos. The forum "owners" could try a bit harder to remove this small limit, until then I won't try to post anymore photos, A picture paints a thousand words, to those who may not understand the wording. Steve. The reasons for the 100kb file-size limit are given in the link Alanb provided above. The limit is built into the software and the software is supported by a 3rd-party, not in-house by Warners personnel. I’ve no idea how simple it would be to increase the limit and this might well have been something that the planned (but now indefinitely postponed) forum overhaul would have covered. (Even forums that appear to have no file-size limit will have one - it’s just large enough to be ‘invisible’ to the majority of the forum users.) As I said on Alanb’s link In the Forum User Guide (towards the top of the main forum webpage) in the Forum FAQ section I have included step-by-step guidance on “Uploading a file or image”, but I can’t alter the software itself. https://forums.outandaboutlive.co.uk/forums/Code-of-Conduct-and-User-Guidelines/Forum-User-Guide/Forums-FAQ/3930/ Many forum members seem able to post an image ’essential’ to a discussion easily, and most people can do it with a little help. The O&AL forums are like elderly Dormobile campervans - they are usable, have some value, but are not particularly pleasant to drive. Link to comment Share on other sites More sharing options...
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