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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 05-08-2010, 10:05 AM   #1 (permalink)
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Unhappy Erratic Acceleration...please Help!!!


Someone PLEEEEEEEEEEASE help.
My 525d Touring (2002) has developed a fault that no one i've taken it to seems to be able to solve.
When I accelerate SLIGHTLY aggressively (When pulling off onto an island slightly sharpish), my Beemer stutters.
By this I mean it accelerates & decelerates until I put my foot down HARD & then it picks up properly.
I can actually see my revs yo yo as I accelerate.
The only acceleration I have is SLOW (Driving miss daisy) or HARD & FAST
I have NO in between
I really can only describe it as losing power & then gaining power in 1 second intervals.

According to the last guy to check using autoboss he says it shows lack of power to turbo.
I have no really heavy smoke from the rear exhaust (Unless I drop my foot heavily on the gas).

I've change ALL the seals on my inlet manifold as he thoguht there may be an air leak.
But apart from a very small leak from my intercooler ( I couldn't see it but he said he could), I cannot find any further leak areas.
He says he checked ALL the pipe work & it seems "OK".

The History on my car is:-
1. The dreaded Butterfly valve issue - changed 4 valves.
2. When the head was placed back on it blew one of my pistons ( Moron who replaced valves unconnected wrong valve which then destroyed one of my pistons) - It now has an extra 4 new valves & NEW pistons etc.

It was "OK" after repair (So far as I can remember) but seems to have developed this issues 5/6 months later.
I have NO oil leaks anywhere either.

PLEEEEEEEEEASE help me as I can't accelerate with passengers in my car without embarrassing myself. (it's either full on or driving miss daisy mode)
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Old 05-08-2010, 05:13 PM   #2 (permalink)
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Maybe dirty injectors, blocked fuel filter, dodgy air flow sensor or possibly throttle position related issue. I am just guessing, but theyd be worth a look.
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