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Re: Boost level and fuel
Posted by BillJ (more from BillJ) on Thu, 27 Jun 2002 07:57:36
In Reply to: Boost level and fuel, Andrew
[Profile/Gallery]
, Wed, 26 Jun 2002 14:24:26
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I'm not too familiar with US octane ratings, but I'll have a go since no-one else has responded yet. I know the 98 RON I use all the time in my Aero is said to be equivalent to 93 or 94 AON, and I imagine 87 AON is pretty poor stuff. It's probably around 91 RON, the lowest allowable in a 9000 according to my '96 9000 handbook. The lowest I have seen in the UK in recent years is 95 RON (around 90 AON). I wouldn't be surprised if this turned out to be the cause, especially if the weather is warm.
The easiest way to eliminate the fuel would be to have him run the tank really low and put in a couple of gallons of higher-octane stuff. If a couple of miles of running doesn't bring the boost back, then it's time to look elsewhere. Keep some decent fuel in it while you're diagnosing and fixing the problem, though, since with low-octane junk in there, you might fix a problem and not know it because the car won't boost higher on low-octane.
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