88 528e races at cold start...

Frank H > wrote:
>
>It now starts up without the racing that it had done before.
>
>After warming up, the idle is just a tad slow, and a bit rough
>sounding at the tail pipes. There is the odd
>bump....bump-bump.........bump...This goes away when I just slightly
>increase the idle speed, by hand or by foot.

Are you sure it wasn't there before the problem started?

It may also be that your plugs are gunked up a bit from the engine having
been run with an improper mixture for a while as a result of the vacuum
leak.

>Perhaps the computer is still sorting out the new conditions.

No, the computer is just combinational logic. It doesn't have any
nonvolatile memory at all, thank God.

>Nothing I could not get used to, that is for sure.
>I am already very happy with these results as it is.

I'd check for more vacuum leaks... then I'd do it again in six months
or when you do your next scheduled maintenance. If there's one rubber part
gone, there are more on the way.
--scott
--
"C'est un Nagra. C'est suisse, et tres, tres precis."

I never noticed any rough idle before, but I am planning to get a new
set of plugs tomorrow, and just switch them.
While I am at it, I will continue to look for vacuum leaks, and also
make it part of my inspections. At least I am more aware now of what a
little leak can do. Those hoses do not get any younger, just like
myself.
Cheers, Frank
..

On 8 Apr 2009 14:26:35 -0400, (Scott Dorsey) wrote:

>Frank H > wrote:
>>
>>It now starts up without the racing that it had done before.
>>
>>After warming up, the idle is just a tad slow, and a bit rough
>>sounding at the tail pipes. There is the odd
>>bump....bump-bump.........bump...This goes away when I just slightly
>>increase the idle speed, by hand or by foot.
>
>Are you sure it wasn't there before the problem started?
>
>It may also be that your plugs are gunked up a bit from the engine having
>been run with an improper mixture for a while as a result of the vacuum
>leak.
>
>>Perhaps the computer is still sorting out the new conditions.
>
>No, the computer is just combinational logic. It doesn't have any
>nonvolatile memory at all, thank God.
>
>>Nothing I could not get used to, that is for sure.
>>I am already very happy with these results as it is.
>
>I'd check for more vacuum leaks... then I'd do it again in six months
>or when you do your next scheduled maintenance. If there's one rubber part
>gone, there are more on the way.
>--scott

Frank H > wrote:
>I never noticed any rough idle before, but I am planning to get a new
>set of plugs tomorrow, and just switch them.
>While I am at it, I will continue to look for vacuum leaks, and also
>make it part of my inspections. At least I am more aware now of what a
>little leak can do. Those hoses do not get any younger, just like
>myself.

The good news is that BMW still has just about everything available for
these cars available, so _now_ is the time to totally replace all the
rubber parts while new ones are still being made.
--scott
--
"C'est un Nagra. C'est suisse, et tres, tres precis."

Frank H wrote:
> Hi gentlemen,
>
> I wonder if somebody has an idea what I can do to fix this myself.
> At cold start in the morning the engine races, and it takes a while to
> calm down, to get to normal idle speed. After that, it restarts fine
> and at proper speed. Is there a sensor that can give a bad reading to
> get such high engine speeds? Coolant level is fine, and i have no
> vacuum leaks as far as I can tell.
> Could it be in the computer perhaps? But I feel it must get the
> request to run very fast from some place.
> I really would appreciate any help I could get.
> In the last while I have started it after cranking it with a
> deliberately entered false code, to get the oil circulating before I
> fire it up with the proper code.
>
> Sincerely, Frank H.

I assume that this car doesn't have a check engine light coming on,
then? I have a Subaru which sometimes has this problem. Everytime it's
happened, after a few times of it happening a check engine light usually
comes on, and it indicates a faulty Oxygen sensor.

Yousuf Khan

On Fri, 10 Apr 2009 16:29:34 -0400, Yousuf Khan >
wrote:

>Frank H wrote:
>> Hi gentlemen,
>>
>> I wonder if somebody has an idea what I can do to fix this myself.
>> At cold start in the morning the engine races, and it takes a while to
>> calm down, to get to normal idle speed. After that, it restarts fine
>> and at proper speed. Is there a sensor that can give a bad reading to
>> get such high engine speeds? Coolant level is fine, and i have no
>> vacuum leaks as far as I can tell.
>> Could it be in the computer perhaps? But I feel it must get the
>> request to run very fast from some place.
>> I really would appreciate any help I could get.
>> In the last while I have started it after cranking it with a
>> deliberately entered false code, to get the oil circulating before I
>> fire it up with the proper code.
>>
>> Sincerely, Frank H.
>
>I assume that this car doesn't have a check engine light coming on,
>then? I have a Subaru which sometimes has this problem. Everytime it's
>happened, after a few times of it happening a check engine light usually
>comes on, and it indicates a faulty Oxygen sensor.
>
> Yousuf Khan

Cripes, Yousuf. you ain't no Usenet Neophyte.
You should know by now to follow an existing thread to the end
first....

;-)