Tried A-Answers but possibly relavent info would not open, much remained unavailable. Anyways, thanks to a recommendation by David Miller regarding a Canadian based reader, I made a posting on an American corolla forum, which is as follows: Theirs a vucuum controlled servo on the fuel pump. When I turn on a/c, it pulls in and lifts idle. So far, so good, however, when I turn of a/c, no drop of idle occurs. If I pull hose off, servo releases and idle drops correctly. Hose I traced to thingy at top of power steering rack? Two other hoses goes to this thingy. Car hoses may be mixed up? Or a/c relay dropping out is not switching a solenoid to drop vacuum to this idle up servo? OR what? Opening bonnet to pull off hose is a drag, so I disconnected the sucker. HELP Me.FINISH/// I checked back today, had 9 looks but no replies. Figure it might end up in the too hard basket. By the way, its a 1997 corrolla 2c that I purchased only last week. I got it cheap as much maintenance (and a good all over scrubbing) was needed. Paid out for a cambelt+pulleys+seals, also an auto tranny flush. Otherwise engine, rad, exhaust, interior, etc, is all in good repair. I think its a Carina by British standards. Hopefully, this variation from the towny may be similar enough or the same to make a comparison. And a warm merry Xmas to all you fine gentlemen, with a safe and properous new year. In the words of our woollen black singlet, shorts and wellington boot wearing, immortal NZ Bard (circa75'), Fred Dagg, "we dont know how lucky we are".... Thanks F

- (#14708) Frank, 30 Dec 04 14:30

OK. If the diaphragm is pulling in that means the solenoid is working OK. There should be three fittings on the solenoid. Vacuum in, vacuum out to the diaphragm, and the third one would normally have a little air filter on. It's there to let air in to break the vacuum inside the diphragm, so that it can retract. A blocked air filter, or the relief port being connected to something else, would cause the diaphragm to hold on.
Now, the power steering thing is interesting. Petrol engined toyotas tend to have a little vacuum valve somewhere around the steering system, linked in to a similar diaphragm. This is all to stop the engine from stalling at full lock. Totally unnecessary IMHO with the torque of the diesel.

I've no idea whatsoever what the correct hose routing should be, and I don't believe the American market vehicles are included on either the Euro or Jap cd. But it's normal for American vehicles to have a hose routing sticker inside the bonnet.

My guess is that the steering thingy is buggering about with the normal idle-up function. But I have no clue, as they say, as to whether the thingy is duff or rather misconnected...

- (#14708) david miller, 30 Dec 04 16:14

There is an electric solenoid and filter nearby, and I beleive the other hoses from the steering vacuum valve go there. So, the steering valve (thingy) is probably in vacuum hose series with electric solenoid and idle up vacuum device. Its dark now, and nearly 2005, will try bypassing steering valve tomorrow. If no luck will have to source diagram(?!), mine was imported from japan in 2000. Is there cd's available for corolla's too? I'm in nz. Thanks David. Yes, turning the steering causes the rpm to wander up and down, when idle up servo has failed to release after a/c off. Somethings up, its originally a deisel and auto. Why have this antistall valve at all? Happy new year all. F

- (#14708) Frank, 31 Dec 04 05:20

I've looked at all the Euro and Jap Corolla parts views that I can find and there are NO diesels that have the p/s valve. Any chance the p/s pump has been replaced?
Does it have EGR?

- (#14708) david miller, 31 Dec 04 15:57