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Re: 88 5000s FI adjustment.....

At 12:52 13.10.98 -0400, Mike Larosa wrote:

>I have a friend with a 88 5000s Avant, Auto that idles too low.
>He has fixed this in the past by adjusting some kind of allen
>screw behind the fuel injection distribution thingy... (Nice technical

The allen screw in question is the mixture adjustment screw. You *must not*
attempt to cure an idle problem by simply altering mixture. While it can
sometimes work, it's guarranteed to cause the engine to run lean or rich at
WOT, hence causing more serious problems. There's a separate idle
adjustment screw provided in the throttle body. You should bring the
mixture back to the specs, then adjust idle speed, then recheck the mixture
and so on, until you get both idle speed and mixture right (they affect
each other to some extent). If you can't do this, it means there's a
another problem (most likely a vacuum leak or bad ISV). The procedure is in
Bentley (but not in Haynes) or e-mail me privately if you need it. I assume
the engine in question is an NF, right?

>And the questions is...  what size allen screw is that ?

3mm. You need a long allen key to reach the screw. 

Aleksander Mierzwa
Warsaw, Poland
87 Audi 5000CS turbo (mine)
88 Renault Medallion wagon (mom's)
91 mountain bike (just in case both cars broke at the same time :-)