Re: 88 528e races at cold start...

In article <vc6jt4hh8uhv1qphvnsvb7epnavblu8629@xxxxxxx>,
daytripper <day_trippr@xxxxxxxxxxxxxxx> wrote:
On Sun, 05 Apr 2009 22:36:59 +0100, "Dave Plowman (News)"
<dave@xxxxxxxxxxxxxxx> wrote:

In article <k2oht417rbt08q18tbg804nqmvuqhuao6u@xxxxxxx>,
Frank H <gacksakura-unsubscribe@xxxxxxxxxxx> wrote:
I have had normal idle for over 10 years before this racing idle speed
started. 2300rpm at cold start is too high I believe. Something is not
right. Which sensor could cause this?

Assuming it's an injection engine check for air leaks round the inlet
system first. Unlike carburettors, these cause a fast idle.

But, he says once the engine has warmed up the idle rpms are normal.
Further, if the engine is warm, a restart does not produce the fast idle
condition.

I suppose an intake manifold leak *might* "heal" once the head has
heated up,

That was my guess.

but it seems much more likely there's an engine temperature
sensor that has gone to Heaven...

I'm not certain what variety of injection was fitted to that model. Some
early systems didn't have ECU controlled idle. But I'm sure some searching
should give details of how it works on that particular one.

--
*When blondes have more fun, do they know it?

Dave Plowman dave@xxxxxxxxxxxxxxx London SW
To e-mail, change noise into sound.
.

Relevant Pages

  • Re: 88 528e races at cold start...
    ... Which sensor could cause this? ... Assuming it's an injection engine check for air leaks round the inlet ... these cause a fast idle. ... he says once the engine has warmed up the idle rpms are normal. ...
    (alt.autos.bmw)
  • Re: 88 528e races at cold start...
    ... 2300rpm at cold start is too high I believe. ... Which sensor could cause this? ... Assuming it's an injection engine check for air leaks round the inlet ... *If all the world is a stage, where is the audience sitting? ...
    (alt.autos.bmw)
  • Re: MOT emissions failure (s )
    ... get the fast idle emissions down far enough to pass. ... re routed the breather hoses away from entering the air ... intake, blocked the pipe up.. ... i have in the past come across pinholed welding around the o2 sensor ...
    (uk.rec.cars.maintenance)