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Re: AIC valve - ready to replace? Posted by RS [Email] (#15) [Profile/Gallery] (more from RS) on Tue, 31 Dec 2013 10:01:29 In Reply to: AIC valve - ready to replace?, Saabath89 [Profile/Gallery] , Mon, 30 Dec 2013 12:44:12 Members do not see ads below this line. - Help Keep This Site Online - Signup |
Since nobody has chimed in yet, here are a few thoughts:
The experience with the '89 SPG I've had for the last 14 years (and the '88 SPG before that) is that fluctuating idle is more often than not caused by vacuum leaks. And there are a lot of potential sources for vacuum leaks:
- rubber bushings that hold the vacuum nipples into the intake manifold
- rubber PCV fitting bushing at the valve cover
- cracked or split rubber vacuum hoses
- cracked vacuum nipples
- Splits in the large PCV hose that runs to the plastic turbo inlet duct.
The most common sources I've found are cracked rubber hoses and oil-softened rubber bushings.
Idle fluctuations by the large PCV hose are sometimes difficult to track down and, sad to say, replacements are tough to come by - like so many rubber and plastic items for C900s, they are NLA. One person posted that they have fabricated a new one using oil-resistant hose but they never posted pictures or any details of how they fabricated it.
Check and deal with those things before you spend hard-earned cash on an AIC valve.
->Posting last edited on Tue, 31 Dec 2013 10:14:04.
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