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- Express & G-Series Vans (https://chevroletforum.com/forum/express-g-series-vans-30/)

- - fast idle (https://chevroletforum.com/forum/express-g-series-vans-30/fast-idle-24984/)

NicaPlanter

August 7th, 2009 12:48 PM

fast idle

My 3500 express has developed a really fast idle after warming up, could this be a vacuum leak somewhere?

winkiesdad

August 15th, 2009 7:36 PM

fast idle

could be a vacume leak which you should be able to hear it sucking air or it may be a sticking EGR valve, I went through that one,gently press on the interior of the egr while it is running

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