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E34 M50 hesitation on cold start



 
 
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  #1  
Old April 24th 06, 06:07 AM posted to alt.autos.bmw
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Default E34 M50 hesitation on cold start

my '92 525i hesitates on cold start. however, car starts right up with no
hesitation if i turn key to on pos a couple times before actually turning
over starter. fuel pump? BTW, car only has 42,000 miles. i recently
purchased from original owner and brought service up to date....cooling
system and transmission service. thanks for you input. Mike


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  #2  
Old April 24th 06, 09:38 AM posted to alt.autos.bmw
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Default E34 M50 hesitation on cold start

In article >,
Mike > wrote:
> my '92 525i hesitates on cold start. however, car starts right up with no
> hesitation if i turn key to on pos a couple times before actually turning
> over starter. fuel pump? BTW, car only has 42,000 miles. i recently
> purchased from original owner and brought service up to date....cooling
> system and transmission service. thanks for you input. Mike


I *think* the fuel pump runs for a short burst when you switch on to fully
pressurise the system then stops if you don't immediately start the car.
Then runs again when you operate the starter, of course, and continues to
run after that. Sounds like you have a leak somewhere or a faulty non
return valve in the pump. Even leaking injectors. A pressure check of the
fuel rail should show this - it should retain full pressure for some time
when the engine is switched off.

(If you had leaking injector(s) I'd expect at least slight problems on a
hot restart after say a couple of minutes)

--
*Keep honking...I'm reloading.

Dave Plowman London SW
To e-mail, change noise into sound.
  #3  
Old April 24th 06, 08:10 PM posted to alt.autos.bmw
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Default E34 M50 hesitation on cold start

I too have cold start probs on a '92 525, but hot or warm restart no
problems - fuel pump?

  #4  
Old April 25th 06, 05:15 PM posted to alt.autos.bmw
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Default E34 M50 hesitation on cold start

Please let me know if you renew a part and fix the problem. I'm wondering
if it's the air flow mass meter....sure hope not because it's about $490 to
renew the part.
> wrote in message
oups.com...
>I too have cold start probs on a '92 525, but hot or warm restart no
> problems - fuel pump?
>



  #5  
Old April 29th 06, 12:24 AM posted to alt.autos.bmw
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Default E34 M50 hesitation on cold start

On Tue, 25 Apr 2006 10:15:46 -0600, Mike wrote:

> Please let me know if you renew a part and fix the problem. I'm wondering
> if it's the air flow mass meter....sure hope not because it's about $490 to
> renew the part.
> > wrote in message
> oups.com...
>>I too have cold start probs on a '92 525, but hot or warm restart no
>> problems - fuel pump?
>>


Don't forget to consider the ignition coils. They are 50 a piece for each
valve and are one of the main ignition causes of immediate ignition
problems. http://www.bmwe34.net/E34main/Mainte...e/M60plugs.asp

This will take some looking into by a mechanic. You want to isolate the
problem before you throw money at it. Join this is you haven't already:

http://216.27.82.195/

Wait 5 days and get your membership card. Find a nearby BMW mechanic(not
a stealership) that gives a 10-20% discount for the membership. Most
do. Get your car diagnosed for those symptoms. Let them check the engine
codes.

As it is now you are looking at 500 dollar parts no matter where you turn.
Make sure you find the problem before the fix. Good luck.

ER

 




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