Engine

Idle Stabilizer Diagnostic / Temporary Fix

>My shark idles at around 5-650RPM and at times is very rough. It
>always seems to threaten to drop off to nothing but doesn't. Also, on
>rare occasions at a stoplight the idle will jump to 11-1200RPM. I am
>beginning to suspect the injectors.
>Any help?

Maybe it's to do with the idle regulator under the front of the intake. Learned a trick from Kevin
Jackson who had surging and after clutching from a high rev the idle dipped enough to stall.
Procedure that diagnosed the idle regulator (problem only cured for a while, it turned out that a
new regulator was needed):

take off the air box top and bottom and air mass sensor
looking into large elbow there is a big vacuum hose exit to the cars' left
this splits into a line to the idle stabiliser and to the intake
feed a capillary tube, about 40 cm, in the line going to the front
this vacuum line branch goes under the intake to the idle regulator
spray wd-40 into the tube a few times and blow it forth (mouth power)
take out the tube, put everything together and let soak in during the night

The next morning my idle was stable, smooth and no more dip. It lasted for quite a few weeks.

Regards,

Math Creemers
87 5sp