11-10-2012, 12:51 PM
Okay, I need some severe help here. I am not new to diesels by any means, having come from the VW turbo diesel scene. However, having recently acquired a dTurbo, I do need help (maybe mental help as well). When I got the dTurbo, it was fine, I rebuilt the pump and then things started happening.
The original pump was the one that start my problems, but they are continuing even though I have replaced the original pump with a spare (the only mods I have done to the spare are the ground LDA pin and governor from the original).
The car doesn't idle properly. It hunts up and down but it's very prounced hunting; i.e. as if I was reving the engine with the accelarator pedal. While it's doing this I can get it in gear without it stalling with some careful clutch control but then it will "bunny hop" down the road until I put my foot down to get it above about 2000 revs. Before this it would just pull itself along smoothly without any throttle. Also at idle occasionally the revs go too low and it just cuts out like when waiting at traffic lights.
Also, if I am driving along and come off the throttle in a high gear, the car will shake violently but not stall. This will happen almost without any warning.
Now onto the third problem, the missfire. There is an audible missfire accompanied by a puff of smoke. It smells strongly of veg which would indictate it is unburnt fuel. The pump is in the middle of the advance bracket so it is not too far retarded.
Things I have done so far to diagnose the problem:
Checked timing
Stripped, cleaned and reassembled injectors
Changed fuel pump
Fiddled with various settings on pump, none of them seem to make a difference at all
Changed manifold gasket
Checked for air in the lines with clear fuel lines as well as running from a bottle of veg
Inspected fuel filter (I doubt this could cause such complex problems anyway)
Replaced fireseals and copper washers
Unscrewed injector lines one at a time-no change
Checked for symtoms of head gasket failure-none
I'm out of ideas. This has been going on for months and it doesn't seem to get any worse, it just stays the same which is surprisingly frustrating because it's like "If there is something so drastically wrong at least break properly" sort of thing. The way it runs you would have thought it was going to blow up on the spot, but it just keeps running like a bag of shit without getting better or worse.
The original pump was the one that start my problems, but they are continuing even though I have replaced the original pump with a spare (the only mods I have done to the spare are the ground LDA pin and governor from the original).
The car doesn't idle properly. It hunts up and down but it's very prounced hunting; i.e. as if I was reving the engine with the accelarator pedal. While it's doing this I can get it in gear without it stalling with some careful clutch control but then it will "bunny hop" down the road until I put my foot down to get it above about 2000 revs. Before this it would just pull itself along smoothly without any throttle. Also at idle occasionally the revs go too low and it just cuts out like when waiting at traffic lights.
Also, if I am driving along and come off the throttle in a high gear, the car will shake violently but not stall. This will happen almost without any warning.
Now onto the third problem, the missfire. There is an audible missfire accompanied by a puff of smoke. It smells strongly of veg which would indictate it is unburnt fuel. The pump is in the middle of the advance bracket so it is not too far retarded.
Things I have done so far to diagnose the problem:
Checked timing
Stripped, cleaned and reassembled injectors
Changed fuel pump
Fiddled with various settings on pump, none of them seem to make a difference at all
Changed manifold gasket
Checked for air in the lines with clear fuel lines as well as running from a bottle of veg
Inspected fuel filter (I doubt this could cause such complex problems anyway)
Replaced fireseals and copper washers
Unscrewed injector lines one at a time-no change
Checked for symtoms of head gasket failure-none
I'm out of ideas. This has been going on for months and it doesn't seem to get any worse, it just stays the same which is surprisingly frustrating because it's like "If there is something so drastically wrong at least break properly" sort of thing. The way it runs you would have thought it was going to blow up on the spot, but it just keeps running like a bag of shit without getting better or worse.