fiatslug87 Posted February 27, 2008 Share Posted February 27, 2008 Thought I'd share my experience since this topic gets a lot of coverage. ’90, 4.0, 5 speed idled at ~1600 rpm, I tightened the intake/exhaust bolts and idle dropped to 1200 (the lower rear one was finger loose). Then my vents stopped working so I fixed the vacuum leak which was in the hard line by the battery. Well guess what, my idle is now at 800!! It makes sense when you think about it since the vacuum to the reservoir comes from the intake manifold but I wouldn’t have looked at the vent line to fix the idle problem. I’ve had the high idle problem for quite a while before the vents stopped working (they also worked intermittently for a while). Is it possible to have enough vacuum for the vents to work while having enough of a vacuum leak for the fast idle? Hope this helps someone. Link to comment Share on other sites More sharing options...
Pete M Posted February 27, 2008 Share Posted February 27, 2008 Is it possible to have enough vacuum for the vents to work while having enough of a vacuum leak for the fast idle? Sure. All depends on where the vacuum leak occurs. Link to comment Share on other sites More sharing options...
BLHTAZ Posted February 27, 2008 Share Posted February 27, 2008 Good info. Thanks for sharing :cheers: Link to comment Share on other sites More sharing options...
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