Date: Sat, 27 Dec 2003 01:07:54 +0000 From: Johannes H Andersen <johsnopsamfitter.com> Subject: Re: Odd idle behavior
Pidgeonpost wrote: > > "Johannes H Andersen" <johsnopsamfitter.com> wrote in message > news:3FEAB225.CF77B8C6nopsamfitter.com... > > > > > > LauraK wrote: > > > > > > Had a very weird experience today with the Saab (1995 9000CS LPT 92K > miles). > > > I had checked everything including the oil before I left to do some > last > > > minute grocery shopping. Everything was fine. > > > On the way to the store, car ran great. > > > Came out and started the car and it was very rough on idle. It stayed > that way > > > all the way home. Everytime I came to a stop, it would start jerking. > The tach > > > would flip rapidly between 1500 and 2000 and the MPG indicator would go > between > > > 0 and 10. > > > Made another stop and this time when I started the car it purred like a > kitten. > > > Ran smooth and perfectly normal the rest of the way home. > > > Any theories? Is this an indication that something is on its last legs > or was > > > it just grumpy? DI was replaced at 70,000. > > > > High rpm could be caused by a vacuum leak. Examine hoses for splits and > listen for > > air leak noises in the engine bay. > > ...happened to me too. Problem in my case was idle air control valve. Before > replacing suggest remove valve, give it a good clean with whatever takes > your fancy (some say petrol, others white spirit, or injector cleaner, > or....). Did this about 12 months ago. Problem was initially made slightly > worse, but was advised to lube lightly (e.g. WD40). Did this - been OK > since. Car is '96 9000 2.3LPT - 132K miles. > Give it a go before replacing the valve - it's not cheap. > > Tim H. Yes, good point. I changed the AIV on my 93' 9000 21.0 LPT 5 years ago, but it was probably OK. Never had problems with the AIV since. Logically, it shouldn't get contaminated if the inlet air is properly filtered and there is no leaks.
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