Date: Fri, 26 Dec 2003 23:00:07 -0000 From: "Pidgeonpost" <timhnopsamhries45.freeserve.co.uk> Subject: Re: Odd idle behavior
"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.
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