02-10-2015, 07:55 AM
So long story short, the hdi has had it.
Two weeks of chasing a fuelling issue resulted in taking a day off work, changing every sensor and relay in the fuel circuit to try and solve the issue of cutting out under full load.
End of the day and the only things that hadn't been changed were the hp pump itself and still with the same problem. Thought to try my other set of injectors back in since they were tappy yet they definitely worked before, old injectors fitted, all good, no leaking took it up the road to see if it solved the cutting out problem, made it about 500 yards and bang! Big puff of exhaust smoke, very loud metallic death rattle from the head. It now only turns over under full throttle just to get idle and when it does there are some very bad noises coming from within the head.
Possible conclusions:
Replacing the cam pulley put the timing too advanced by thousandths of a mm, just enough to kiss a valve at high rpm which resulted in bending then snapping
Or, injectors were the fuel problem, only 3 seemed to be fuelling properly and one was possibly causing a massive hot spot in the head with the numerous test drives trying to see if changing fuel system components had fixed it.
The fault flagged up on pp2k was intermittent fuel pressure monitoring fault (leak) which could be anything from the pressure regulator, fuel pump relay, rail sensor...
Looking for a new engine now
Two weeks of chasing a fuelling issue resulted in taking a day off work, changing every sensor and relay in the fuel circuit to try and solve the issue of cutting out under full load.
End of the day and the only things that hadn't been changed were the hp pump itself and still with the same problem. Thought to try my other set of injectors back in since they were tappy yet they definitely worked before, old injectors fitted, all good, no leaking took it up the road to see if it solved the cutting out problem, made it about 500 yards and bang! Big puff of exhaust smoke, very loud metallic death rattle from the head. It now only turns over under full throttle just to get idle and when it does there are some very bad noises coming from within the head.
Possible conclusions:
Replacing the cam pulley put the timing too advanced by thousandths of a mm, just enough to kiss a valve at high rpm which resulted in bending then snapping
Or, injectors were the fuel problem, only 3 seemed to be fuelling properly and one was possibly causing a massive hot spot in the head with the numerous test drives trying to see if changing fuel system components had fixed it.
The fault flagged up on pp2k was intermittent fuel pressure monitoring fault (leak) which could be anything from the pressure regulator, fuel pump relay, rail sensor...
Looking for a new engine now
Current stable
'09 Mercedes E320cdi wagon
'99 306 gti6
'09 Mercedes E320cdi wagon
'99 306 gti6