You use a seperate carter pump about 48 lpm I thinkQuote:
Originally Posted by Sprock
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You use a seperate carter pump about 48 lpm I thinkQuote:
Originally Posted by Sprock
Just found Fletchs' post about lift pump . I'll try that . If the Injector pumps' the problem that won't solve it will it ? Changed ECU relay this mornin - check light still on but no loss of power at this stage but that fluctuates every other time anyway . Will disconnect batteries again now that I've played around with a few things & see if it goes away . Not confident but we'll see .
You mean the ECM relays dont you,
you can swap with the air-con just for test purposes
Nope, you are not masking a problem with a additional lift pump, indeed you are helping the system big time and best news; also brings improvement to low down torque as well.Quote:
Originally Posted by threedogs
Bosch designed the injection pump to work with additional lift pump (VP44 has internal lift pump to cope with certain fuel flow) but left it up to vendors/manufacturers to implement , most don't as that means extra money to spent and we all know how vehicle manufacturers design their vehicles: bare minimum and cheapest!
Once under full load the internal lift pump barely copes on its own especially at lower revs range when fuel is used not only for power but for lubrication, cooling and hydraulic timing operation. Ever wondered why ZD30 Di is such a slug at take off, watch the ICV% as it drops bellow 50% it needs to go higher for fuel timing advance, essentially a drop in the pressure and volume causes the injection timing to retard hence a poor performance on take offs.
Bosch radial injection pumps are terrible design and nightmare for customers full stop. This lunacy finally stopped when "common rail" was reinvented again.....
Regards
Not really if the pump is already knackered but since you are well advised to fit lift pump for a new/replacement IP what have you got to loose by trying the lift pump first.Quote:
Originally Posted by Sprock
Having positive pressure on the suction line might show other problem which is the cause (leak)
Just don't forget you will have to carry out "injector leak off line fuel return mod" before fitting the lift pump otherwise you'll pump the sump full of diesel in no time.....
Regards
Thanks all for your input , yeah 3dogs the ECM relays - that's what I've always called them but someone referred to them as 'ECU' relays so I thought Nissan terminology was different to Cummins like I'm used to . Swapped A/C relay with ECM & went for a drive & engine light came on but no power loss - sometimes it takes a while other times power loss is instant . Disconnected batteries while I removed intercooler & pipes to check & clean , fair bit of oily gunge around the sides of intake pipe directly above EGR pipe but nowhere as bad as some of the pics I've seen. Ran out of time to pull manifold off but cleaned down in there as far as I could with a bent screwdriver & rags . Took it for a squirt for 20mins & touch wood NO LIGHT came on , I'm not confident as I haven't really changed anything apart from ECM relay , however optimistically hopeful it helped & disconnecting batteries reset ECM .
Thanks Rumcajs - Fletchs' post about lift pump clearly states ( & shows ) the spill line mod . I'll try that as like you say I've got nothing to lose .
Hey my catch can arrived - it's poor quality plastic thing & the lid doesn't screw on properly , it does however have a stainless mesh filter . It was $100 & now I see on EBay there's allot catch cans for half that price but don't look to have a filter - do they need 1 or can someone give me direction to a decent catch can ?
Mudski is a vendor here look up northern4x4 on ebay mate..send him a pm here and he'll look after you
Thanks mate 👍🏼