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Two questions... hesitation and spark plugs
Posted by Aaron S. [Email] (more from Aaron S.) on Mon, 9 Apr 2007 20:24:00
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I've been getting a bit of a hesitation lately in my 9000. ('91, 2.3 nonturbo, 5 speed) It only happens at low RPMs, so once I've gotten up to speed it is pretty normal, but the RPM range it hesitates at is starting to get higher. I have to rev a bit to start off or it will choke and sit without building speed for a few seconds no matter how hard I hold on the gas. Also, my fuel mileage seems to have tanked since this happened. I only get about 22MPG around town now. I'm used to getting 26-28. My highway mileage is still in the low 30s, and it drives fine up there, it just chokes at lower speeds. I've replaced the fuel and air filters, which helped slightly, but it is still there. I suppose next is the spark plugs. Anything else I should try?
Which brings me to my next question. It is a Saab DI engine, so I know it is very sensitive to spark plugs. I bought the car used and don't have a manual, and searching on car sites comes up with an assorted list of Bosch, Denso, and NGK plugs (made in different countries too, so not rebranded) which are all listed as OEM. And this is for the 2.3 DI. So I'm assuming that any of them will be fine? I just don't want to cook my DI cartridge. Also, one of the plugs listed are the platinum +4s. Do those offer any real advantage, or is it just a gimmick? Thanks in advance.
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