Weird engine rpm drop when coasting
#1
![Default](/forum/images/icons/icon1.gif)
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 gear
but 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
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 gear
but 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
#2
CF Monarch
![Default](/forum/images/icons/icon1.gif)
Downshifting will cause RPMs to increase, but cause the car to slow. [/align]You might have to get the codes read at an auto parts store to get a better diagnosis but I don't think that its downshifting.[/align]
#4
![Default](/forum/images/icons/icon1.gif)
HAVC controls off, even tried with the fan completely off and it still does it when my foot is off the gas and coasting. If I turn on the air it seems to hold a little more throttle than normal and actually doesn't see do do the rpm drop. If I put it in Neutral when coasting off the freeway of course I don't feel it like when it's in gear but I still can see the rpm's just bouncing up and down.
Thread
Thread Starter
Forum
Replies
Last Post
CADru
Express, Savana & G-Series Vans
7
September 28th, 2019 7:26 AM
97RedBull
General Tech
0
February 12th, 2010 6:58 PM