Adjusting fuel mixture

["content22207" <brobertson@xxxx>]

Fully agree that fuel mixture screw isn't going to turn itself. If
yours hasn't been touched, look elsewhere for problem.

BUT

If you've touched screw and want to put it right again, there's a
visual procedure known as "cracking" a fuel injector:

1) Ensure everything else on engine is tight, properly adjusted, etc.
Make sure you don't have vacuum leak in front of vehicle (cap big take
off on passenger intake rail). MAKE SURE PROBLEM ISN'T WARM UP
REGULATOR. You only want to do this to put mixture screw back where it
used to be.

2) Run engine until warm (driver's formed coolant hose hot --
thermostat open).

3) Stop engine. Pop #3 fuel injector out of head and place in neck of
empty Coke bottle. Use length of 3/4" hose and 1/2 NPT pipe plug (or
other suitable metal object) to cap #3 injector port. Is little bit of
tight fit over metal lip.

4) Restart engine. You'll be able to see injector spray pattern in
Coke bottle. Adjust fuel mixture screw until pattern just changes from
a stream to a spray (clockwise to richen, counter to lean). This is a
"cracked" injector.

5) Leave mixture screw alone in the future.

Yet another helpful procedure from the Volvo newsgroups (DMC owners
should hang out there too -- treasure trove of useful info).

Bill Robertson#5939 (acting more like a Swedish "brick" every day)