Re: An URGENT CALL FOR HELP! Stuck in LA!
Posted: Thu Nov 20, 2008 11:00 am
Has anyone seen the movie "The never Ending Story"?
This one features a green Delica instead of that giant flying dog thing...
So we actually got to drive it yesterday, although the experience wasn't very reassuring. The pump went on, the engine ran and it idled ok, but under load it went nowhere. It was SUPER-SLOW.
Basically, initial take-off felt OK, but as the revs built nothing really happened. It continued to build revs (slowly) until about 3000rpm then it would rather roughly change gears. After a bit of thinking and looking around they found some kind of plate that could have been on backwards - I'm not sure of the location of this "plate" (I wasn't there), but they were saying it had something to do with the turbo. This part was assembled by the pump rebuilders, not the garage where the van is.
Now, from these sketchy details I have come up with some ideas. I'm assuming the fuel pump has to have some kind of turbo pressure feedback system, so when the turbo is boosting the engine will receive more fuel. If this "plate" is somewhere in the connection between the turbo and the fuel pump and it's leaking, the fuel pump would not see the rise in boost pressure and would not be delivering fuel accordingly.
So although the turbo may be spinning, it's not delivering enough fuel to generate any useful boost, and we've effectively got a non-turbo 2.5L D lugging around a 2 tonne van.
Once again, I should know more in a couple of hours - I'm just guessing with all of this.
As for our previous problem with the bench test - you know how manufacturers have tiny, tiny percentages of manufactured parts that just fail immediately? Well, we got one of those parts when the pump was rebuilt. They changed it and it's fine - passed the bench test without a problem.
This one features a green Delica instead of that giant flying dog thing...
So we actually got to drive it yesterday, although the experience wasn't very reassuring. The pump went on, the engine ran and it idled ok, but under load it went nowhere. It was SUPER-SLOW.
Basically, initial take-off felt OK, but as the revs built nothing really happened. It continued to build revs (slowly) until about 3000rpm then it would rather roughly change gears. After a bit of thinking and looking around they found some kind of plate that could have been on backwards - I'm not sure of the location of this "plate" (I wasn't there), but they were saying it had something to do with the turbo. This part was assembled by the pump rebuilders, not the garage where the van is.
Now, from these sketchy details I have come up with some ideas. I'm assuming the fuel pump has to have some kind of turbo pressure feedback system, so when the turbo is boosting the engine will receive more fuel. If this "plate" is somewhere in the connection between the turbo and the fuel pump and it's leaking, the fuel pump would not see the rise in boost pressure and would not be delivering fuel accordingly.
So although the turbo may be spinning, it's not delivering enough fuel to generate any useful boost, and we've effectively got a non-turbo 2.5L D lugging around a 2 tonne van.
Once again, I should know more in a couple of hours - I'm just guessing with all of this.
As for our previous problem with the bench test - you know how manufacturers have tiny, tiny percentages of manufactured parts that just fail immediately? Well, we got one of those parts when the pump was rebuilt. They changed it and it's fine - passed the bench test without a problem.