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Weird engine rpm drop when coasting

4 messages,  Last post on Sep 07, 2009 at 5:17 PM

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#1 of 4 Weird engine rpm drop when coasting by sedmonds Oct 04, 2008 (5:39 pm)
Before I take it in and have the dealer guess on what the issue is I thought I'd post and see if anyone has past knowledge of this issue. 2008 Aveo5 AT, 5k miles. When I coast with my foot off the throttle I get a regular pulsing drop in RPM's. Normally from 50mph to around 35mph as the car slows the rpm will drop from 1600 to 900 or so and then back up 1600. I first I thought it was downshifting as the car slowed by I know I don't have 10 gears. It feels like someone is touching the brake every second or two. I have tried this coasting in neutral and of course I don't feel the slow down like when in gearmbut I do the the rpm gauge bouncing up and down. I have not have any codes or warning lights. I do have a scangauge attached. Any ideas ? Steven Replies to this message: blasterollin (Nov 01, 2008 9:15 am) fendergibs (Sep 07, 2009 3:14 pm) sedmonds (Sep 07, 2009 5:17 pm)
#2 of 4 Re: Weird engine rpm drop when coasting [sedmonds] by blasterollin Nov 01, 2008 (9:15 am)
Replying to: sedmonds (Oct 04, 2008 5:39 pm) There is a tsb (technical service bulitin) on aveo 04-07, about exhaust and intake valve seats, ask about full replacment under warranty if you still are that is
#3 of 4 Re: Weird engine rpm drop when coasting [sedmonds] by fendergibs Sep 07, 2009 (3:14 pm)
Replying to: sedmonds (Oct 04, 2008 5:39 pm) steven,   did u find a solution to your rmp flucuations while coasting as my car have dev a simlar prob? 2001 automatic bmw 330c   any thoughts??   thanks rob Replies to this message: sedmonds (Sep 07, 2009 5:17 pm)
#4 of 4 Re: Weird engine rpm drop when coasting [fendergibs] by sedmonds Sep 07, 2009 (5:17 pm)
Replying to: fendergibs (Sep 07, 2009 3:14 pm) Never have gotten an answer or solution from dealer. I have found several others that have the same experience to some degree. I think it has to do with the fact it is electronic throttle, no wires, just computer inputs.

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