Idle chat

[martin.herwitson]

Can anyone offer some advice? I'm struggling. Silvias idle speed has increased and now runs about 1000rpm, If I simply adjust the tickover then its too low when the engine is cold? I have tested the air control unit (choke?) as detailed in the manual...o.k. tested the engine temperature sensor...o.k. I have noticed that switching on several electrical items, lights, heater & rear screen heater causes the rpm to drop and I'm sure there should be some automatic compensation for this but I can find no mention of such a unit in the service manual and I can't think of anything else that would increase the idle like this?

any help would be appreciated.....Marty

[s13eater]

the iaa unit where you alter the tickover has the voltage compensator in it, could you have an air leek ?.

[30psi]

There is an adjustment screw for the pickup from when air con is turned on, might be an idea to see if this helps. Not sure if it switches on with the lights though.

Its probably an issue with the air regulator, prob needs cleaning. The S12 should idle at about 1,300rpm for about 30 secs when cold and slowly drop to about 8-900rpm when hot.

[s12Rob]

mine i think has an issue, start up from cold, idles about 500 rmp then picks up once hot to abuot 750. any ideas

[PukkaSilvia]

A good idea is to start your own thread rather than making this thread confusing with 2 different cars and problems.

[30psi]

Its the same problem though? Low idle when cold.