Date: Sun, 20 Dec 1998 10:26:34 -0800
From: "Douglas Swank" <>
Subject: Re: Ideas Needed: RPM Hunting at Idle

I would say the RPM hunting is normal *if* it's a turbo (due to the APC system), but not to that extent. I have had an '86 9000T, an '89 9000CDT, and my parents have had an '88 9000T and on all three normal idle would cycle between approx. 800-950 RPM, but at nowhere near 25 Hz, more like 25 cycles per minute. Three things that will oftentimes affect the idle are a bad AIC valve, a bad turbo bypass valve, or a bad air mass meter. -Doug Johan LAUWERS wrote: > >I believe the hunting of the RPM is normal. > >My father had it on both his 9000's. > >Johan. > >

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