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5 Posts
Hi,
new to the forum would appreciate some help with a real odd problem I have with a dci 100 master. Vehicle came into use with non start in the mornings and poor running, did an injector leak back test, no 4 was leaking back before the others were even starting to fill, and number 2 wasnt far behind, 1 and 3 were matched perfectly. Changed 4 and 2, rechecked the leak back and they were all now well within tolerance and used gen renault parts, (cheaper than everyone else!!!) van now revved clean, no more misfire, roadtested and all ok. Went to start it up 2 hours later to recheck, bugger to start, and tottally flat when revved, pumped the primer and re reved all good. let it run to see if system had air in, turned off and retested 2 hours later same fault. Removed fuel filter and housing, fuel filter was old and quite badly blocked, change for new with seals. rechecked and guess what, same thing again!!!! rechecked fuel filter housing and did a vac test on to make sure its not leaking, seems fine.
Scanned using my snap on Modis, no fault codes apart from airflow meter (it doesn't have one, so no prob there).
Heres the thing, on live data the commom rail instantly sees 300 bar on start up, but the engine will be flat as a witches *** to rev, go to the engine bay pump the primer 3 times, or leave it to idle for 20 seconds and it will rev perfectly cleanly, and yet the live data is still showing 300 bar wether its revving flat or revving cleanly.
On the clear fuel line from the filter to the primer to the tank (the in line) after 10 seconds from shut down an air bubble will appear and continue to grow, so obviously air is getting in the system, but I have checked and double checked the filter housing, and the only place I can think its getting in (due to the way the air bubble travels towards the tank) is fowards of the filter housing ie pipe to the high pressure pump. This in itself is odd, and it has a spur off to nothing, next to the high pressure pump, could this be leaking?? I cant see it being the high pressure pump due to the live data readings when flat and when fine is the same, no other fault codes are stored, and the problem starting from cold HAS to indicate diesel leak back, and when I say problem I mean it takes 7/8 attempts to start.
Does the return system affect leak back on these systems, sory if that sounds stupid but it back feeds to the high pressure pump and then back to the tank so I would have thought the systems are seperate.
Please help me someone this van is starting to test my knowledge and patience!
Thanks in advance
Rich
new to the forum would appreciate some help with a real odd problem I have with a dci 100 master. Vehicle came into use with non start in the mornings and poor running, did an injector leak back test, no 4 was leaking back before the others were even starting to fill, and number 2 wasnt far behind, 1 and 3 were matched perfectly. Changed 4 and 2, rechecked the leak back and they were all now well within tolerance and used gen renault parts, (cheaper than everyone else!!!) van now revved clean, no more misfire, roadtested and all ok. Went to start it up 2 hours later to recheck, bugger to start, and tottally flat when revved, pumped the primer and re reved all good. let it run to see if system had air in, turned off and retested 2 hours later same fault. Removed fuel filter and housing, fuel filter was old and quite badly blocked, change for new with seals. rechecked and guess what, same thing again!!!! rechecked fuel filter housing and did a vac test on to make sure its not leaking, seems fine.
Scanned using my snap on Modis, no fault codes apart from airflow meter (it doesn't have one, so no prob there).
Heres the thing, on live data the commom rail instantly sees 300 bar on start up, but the engine will be flat as a witches *** to rev, go to the engine bay pump the primer 3 times, or leave it to idle for 20 seconds and it will rev perfectly cleanly, and yet the live data is still showing 300 bar wether its revving flat or revving cleanly.
On the clear fuel line from the filter to the primer to the tank (the in line) after 10 seconds from shut down an air bubble will appear and continue to grow, so obviously air is getting in the system, but I have checked and double checked the filter housing, and the only place I can think its getting in (due to the way the air bubble travels towards the tank) is fowards of the filter housing ie pipe to the high pressure pump. This in itself is odd, and it has a spur off to nothing, next to the high pressure pump, could this be leaking?? I cant see it being the high pressure pump due to the live data readings when flat and when fine is the same, no other fault codes are stored, and the problem starting from cold HAS to indicate diesel leak back, and when I say problem I mean it takes 7/8 attempts to start.
Does the return system affect leak back on these systems, sory if that sounds stupid but it back feeds to the high pressure pump and then back to the tank so I would have thought the systems are seperate.
Please help me someone this van is starting to test my knowledge and patience!
Thanks in advance
Rich
