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Hello,
Forget about messing with the timing to get rid of it. If that was a solution then Volvo would have designed the B230F to have timing set that way and use cheap ass gas. Note in the owner's manual (if you have one) that the recommended fuel is an AKI (anti-knock index) eqiuvalent of 89. For those of us in North America, that translates into a RON (research octane number) of 91. Hence premium fuel is required for your 240 to not ping, go through plugs prematurely, gum up your catalytic converter and of course pass your next emissions test.
Here's my two cents. Or three. There are 3 life bloods to your engine. Oil, coolant and gas. Go cheap on any (or combination thereof) and you risk unpredictable issues with your brick. Out of all three I would consider fuel to be the most valuable of the bunch. Premium will give better mileage, so the difference in cost will be partly offset. Plus most gas stations typically give you more "bonus bucks" or "points" or whatever purchase incentive for using their premium fuel. The rest you will save in longer lasting basic tune-up items.
Happy Bricking!!!
Richard
87 245 DL 355,000 km
82 242 GLT 121,000 km
http://members.cardomain.com/richink
P.S. - Out of the last 4 bricks that I have owned and used premium in, not a single fuel or cold start injector has failed in over 450,000 km of driving - COINCIDENCE???
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