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there was a bullettin about tweaking the cam timing to smooth out a fluctuating idle. That's all I remember, I can look it up next time I'm at the dealership. I don't think it was as much as 4 degrees though. I knew a tech who tried it on a '99 S80 T6, and really screwed it up, idle became horrible and check engine light was on for a CVVT (continuous variable valve timing) solenoid code, retimed the engine, and all it needed was an air mass meter.
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cjregensurger@yahoo.com '86, '88 740 GLE; '88, 89 740 Turbo, '88 760 Ti
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