Re: 200 Turbo 2 WD surging and noisy fuel pump.

[Pcarselle <pcarselle@worldnet.att.net>]

Chris Wilson wrote:
> 
> 1987 Audi 200 Turbo 2WD. 80K miles.Fuel pump noise started about 2
> etc....
> --
>     Best Regards,
>                  Chris Wilson
> http://www.maximun-bhp.u-net.com
> mailto:chris@maximum-bhp.u-net.comChris:
Re- your questions:
1.- No specific problems with gas pump other than getting noisy. After noise starts, the 
pump may last for 5o,ooo miles or more, it is only irritant !
2.- Computer (ECU) controls waste gate release, Internal spring controls mechanical 
response to boost. In your case if you are getting 1.4 to 1.5 bar.... you are boosting 
within good parameters, unless someone altered the computer mapping or spring wastegate 
spring in which case you would fly ! and boost in excess or previously mentioned 
readings.
3.- Fail safe device is computer controlled and is a gas pump shut-off via relay 
intervention !
4.- Accuracy of reading of boost meter I believe to be +/- 10% but is affected by 
adjustment.
5.- Water temp failure from intermittent to full death is "very common !!!!". Trouble is 
multisender ( it also feeds computer ) located in the block at the point where the upper 
radiator hose connects ( I believe there are two other sensors in the same area), and 
the particular sender has an hexagonal brass nut, and a 4 wire connector coming in form 
the bottom. It is the cluprit!!!.
6.- Replace fuel filter, air filter and check "ground connection to intake manifold" I 
mean "clean it !!!", then check as many vaccum hoses as you can for leaks, in that order 
Good Luck !
Pablo