Re: <E28> flat spot - engine acceleration

[alex.fadeev@xxxxxxxxxxx]

whensley11@domain.elided wrote:
> 
> On a 1987 528e with an automatic transmission, the engine has a 
> "flat spot" or hesitation when you accelerate.  Once it picks up,
> it's fine. 

Is the hesitation related to engine temperature? Ambient temperature? 
Throttle position? Slush box gear selection?
Barring further details, I would go with the usual suspect - the Idle 
Control Valve (ICV). Even if it passes Bentley resistance checks it may 
still be bad. New ones used to go for around $100 and junk yard used ones 
for half that. Or borrow one from a friend who owns an Eta engined bimmer.

> Also at idle.

Engine hesistates at idle?
Do you mean your idle is unstable?

> There's been quite a bit of energy (and money!) expended to solve 
> this, but so far it remains elusive.

What checks and new parts did all that money buy you?

> Any ideas?

Yeah, but we need more background info to narrow things down.

alex f

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