Question about 1992 Ford Explorer

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A very rough idle and hissing intake sound was traced in part to a loose vacuum hose on a fitting connected to the intake. There is still an open vacuum fitting pointed towards the firewall for which I can't find a detached hose. When I plug it, the idle completely normalizes. Am I missing a plug, or is there a loose hose I'm overlooking?

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  • Ford Master
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I'd just plug it...If it's important, something will show up as not working, then you can connect it!

Posted on Mar 07, 2009

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My 2007 Chevy Silverado loses power when I come to a complete stop no engine lights appear but if I turn off the truck the problem goes away for awhile .


Loss of power, but no mention of rough or inability to idle (including stalling). If those additional symptoms are part of the problem, check for a vacuum leak to the intake. Listen for hissing or sucking noises near air hoses. Look for loose, cracked, or broken air hose connections. Check PCV valve...Cheap to replace, could be sticking, then loosen after truck sitting with engine off. A vacuum leak will not give any light indications, and vehicle will seem to run normal when applying gas, but will want to stall or run rough (or want to stall) when at idle or sometimes when taking foot off gas when slowing down.

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