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5-Series (E12,E28, E34, E39, E60) Chat relating to the BMW 5-Series of all generations. Specific models include: BMW 518, BMW 520, BMW 520i, BMW 530i, BMW 528i, BMW 530i, BMW 518i, BMW 524d, BMW 525i, BMW 525e, BMW 528e, BMW 540i, BMW 535i, BMW 520d, BMW 525td, BMW 525d, BMW 530d, BMW 525i/xi, BMW 530i/xi. (BMW 5-Series Forum)

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Old 04-26-2008, 07:57 PM   #1 (permalink)
n00b
 
Join Date: Apr 2008
Location: New Zealand
Car: 1994 E34 525TD, all standard.
Posts: 5
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rolli is on a distinguished road
Unhappy E34 525TD running very rough

Hi All
I have a 1994 E34 525td which has stumped everyone I have taken it to.
The injection pump can be adjusted to make it either idle smoothly, but with no throttle, or to have throttle but run very rough - hunting, I believe is the correct term. This a fly-by-wire system - no accelerator cable.
It has a remanufactured injection pump, reconditioned injectors, a new in-tank fuel pump, and the fuel filter has been replaced.
I guess part of the problem is I'm in New Zealand and I'm only aware of 2 of these in the country, which would be why nobody knows much about them. I believe the other one is still running OK.
Before the new injection pump went in it didn't hunt as bad as it does now.
It runs well for about 4 minutes - until the engine starts to warm up - then the hunting quickly gets worse.
With the top of the pump removed (I think) the mechanic has watched the throttle device moving quickly back and forth causing the irregular idle etc.
I really like the car, but it's driving me crazy!
I will be very grateful for any help/sugestions.
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