Re: MB engine overboost.

[Avi <Avi@cosmoslink.net>]

Why is extra power a problem?........
I'll trade you with my problem, underboost........
Avi


At 12:20 PM 12/29/97 UCT, you wrote:
>
>Hello,
>
>Its Joe Lowe again with the '89 MB Ur quattro.  Some of you might remember 
>that I wrote back in August asking the question why my engine gave me over 
>boost and then cut out.  I got a satisfactory answer and spoke to BR 
>Motorsport on the matter, confirming that it is known as "MB warm up over 
>boost".  I also found out that back then there is was no cure for this 
>problem.
>
>Well over the past month or so I have been experiencing over boost on a few 
>long journeys.  The over boost has happened on approx 50% of the long 
>journeys and has either been on the journey to or from the destination but 
>never both.   The car has been hot and running for between 30 minutes and an 
>hour when the problem manifests itself.  I'm unsure if the air temperature 
>has suddenly dropped causing this to happen.  It mainly happens if the 
>engine is at 3000 rpm or over and the throttle is being opened more than 
>half way.  Some times I can feel the extra urge the over boost gives at at 
>around 2500 rpm and if I back off the throttle the engine will not cut out. 
> I have had the situation were I get over boost and the engine cuts I have 
>backed off the, engine comes back to life, I have put my foot down again but 
>only lightly and I get over boost again, this will repeat itself 3 or 4 
>times and then it will be fine.  This problem does not affect the whole 
>journey either.  As you can imagine it is embarrasing for me, uncomfortable 
>for my passangers and dangerous for other road users. So please if there is 
>anybody that can help I would really appreciate it.
>
>Apart from this the car is wonderful.
>
>Regards,
>
>Joe Lowe.
>
>