You talking about the flame trap? Since his car is a non-turbo, it could have it, but Volvo quit putting it in their cars in late '96. Volvo mechanics take them out and throw them away. I sort of doubt that's what the problem is unless I misunderstood what you were talking about. Of course, the area where the normal flame trap would go can get clogged too. A smaller vacuum line links in from a larger one at this spot.
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1998 S70 T5 Emarald Green Metallic, 2004 V70 2.5T Ruby Red, Previous Owner of Black '94 850 Turbo Wagon. My cars have been running so well lately they've got me worried.