idle rpm
- Thread starter rshaw
- Start date
You gotta tell us more....
Fuel injected or carbed? What year and engine? Any mods?
And are you reading the RPM from the car's dashboard tach, or are you hooking up a proper dwell/tach to the distributor to measure the RPM? The stock dashboard tach is fairly unreliable.
Fuel injected or carbed? What year and engine? Any mods?
And are you reading the RPM from the car's dashboard tach, or are you hooking up a proper dwell/tach to the distributor to measure the RPM? The stock dashboard tach is fairly unreliable.
rshaw
True Classic
same thing happend last fall also
i adjusted the screw on the linkage to lower the idle and thought nothing of it until this summer had to put it back because the idle was back to 600 rpm
I figure it has something to do with the high idle circuit but when I first start up the idle is around 1500 and it kicks down to 1300.
i adjusted the screw on the linkage to lower the idle and thought nothing of it until this summer had to put it back because the idle was back to 600 rpm
I figure it has something to do with the high idle circuit but when I first start up the idle is around 1500 and it kicks down to 1300.
Idle, etc...
On the injected models, the idle adjustment is not on the linkage but instead on top of the throttle body.
There is a 17mm locknut with a slotted screw in the center, clockwise screws it in and lowers the idle, counter-clockwise does the opposite.
Your idle can change if the Auxiliary Air Valve decides to suddenly work, or if you have air or fuel leak (think bad injector spray pattern).
You may need to follow the idle setting instructions in the "best of" if you've messed with it too much. The adjustment on the linkage is only a throttle stop.
On the injected models, the idle adjustment is not on the linkage but instead on top of the throttle body.
There is a 17mm locknut with a slotted screw in the center, clockwise screws it in and lowers the idle, counter-clockwise does the opposite.
Your idle can change if the Auxiliary Air Valve decides to suddenly work, or if you have air or fuel leak (think bad injector spray pattern).
You may need to follow the idle setting instructions in the "best of" if you've messed with it too much. The adjustment on the linkage is only a throttle stop.
rshaw
True Classic
drove x to work yesterday and the idle was surging 1500 to 1800
drove home was idling at 1800
tps ok
changed aux air valve and initially no change
checked volts on connector was 14.4
changed double relay for kicks... nope.
pinching of aux air line and no change
decided to adjust idle and would only lower to about 1100
then...... I turn my back and it suddenly lowered to about 700
the only thing that was different was engine temp got hotter than normal running (for this time of year)
anyway adjusted idle to about 900 and drove to work today all ok
another x mystery
drove home was idling at 1800
tps ok
changed aux air valve and initially no change
checked volts on connector was 14.4
changed double relay for kicks... nope.
pinching of aux air line and no change
decided to adjust idle and would only lower to about 1100
then...... I turn my back and it suddenly lowered to about 700
the only thing that was different was engine temp got hotter than normal running (for this time of year)
anyway adjusted idle to about 900 and drove to work today all ok
another x mystery
Check this too...
The Auxiliary Air Valve is partly warmed through its mounting, in that it absorbs heat through its housing from whatever it's mounted too. On the X it's the block and the bolts need to be tight for this to work. It's also heated with an internal electrical element and 12v from the ignition switch.
I bring this up because mine was found to be loosely bolted and although it was difficult to tighten, it helped with my idle.
The Auxiliary Air Valve is partly warmed through its mounting, in that it absorbs heat through its housing from whatever it's mounted too. On the X it's the block and the bolts need to be tight for this to work. It's also heated with an internal electrical element and 12v from the ignition switch.
I bring this up because mine was found to be loosely bolted and although it was difficult to tighten, it helped with my idle.