Biba:
Fuel rail: I've not paid attention to the past discussions
regarding replacing the fuel hoses. I recall something about
barbs and that there is a very specific size of hose to use,
but... Can someone enlighten me what is involved?
The injectors are connected to the fuel rail with 8 mm fuel injection hose.
Most auto stores carry 5/16" which is very close and can be substituted.
I've found the 8 mm hose to be slightly easier to put on. Use ONLY fuel
injection hose, not regular fuel hose. The hoses are retained on the rail
and injector nipples by tapered barbs. The only way to remove the hoses is
to cut them. Make a slice lengthwise along the mounted section of hose and
you should be able to pull it off. Cut new hoses using the old ones as a
gauge for length. Then, placing the metal ring over the nipple first, press
the new piece of hose onto its nipple. This will take a good deal of force,
and may even leave your palm bruised. Make sure the hose is seated all the
way down, against the ring. Install the hoses dry. Use no lubricant or
gas. And make sure you orient each injector correctly as you attach it to
the rail.
The 'section' with the butterfly: Does the coil spring, when
removed, just unwind a little bit, or are there a specific
number of turns from rest before/while installing? If the
latter (of course) how many turns?
Uh oh. It sounds like you're describing the airflow meter, that's attached
to the end of the large intake hose and the air cleaner housing. Is that
right? Or are you describing the throttle body, which is attached to the
other end of the hose and the intake plenum? If someone has disturbed the
setting on the airflow meter, that's really bad. You may or may not be able
to get it set back to where it belongs. The best way I have found is to
disconnect the O2 sensor with the car warmed up and running. Place the
positive lead of a VOM on the O2 sensor's output wire, and the negative lead
of the VOM on a ground. You're looking for the O2 sensor to read about 0.5
volts DC. If it's higher than that, the mixture is rich. Increase the
spring tension to bring the reading in line. Increasing the spring tension
will lean out the engine, reducing it will make it richer. Again, you're
looking for somewhere near 0.5 volts. After you get it close, then use the
air bypass screw on the airflow meter to set it right on. Closing the screw
(clockwise rotation) enriches the mixture. Turning the screw out
(counter-clockwise rotation) leans out the mixture. Once set, when you
reconnect the O2 sensor, you shouldn't notice a significant change in idle
speed or smoothness. And once set, seal the cover with silicone so that
nobody messes with it again. The air bypass screw is the only thing on the
airflow meter that should be adjusted.
Rich Wagner
Montrose, CO, USA
'82 GTV6
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