NAIOA.comNAIOA.comNAIOA.com
 Create an Account
 

  
NAIOA Impala Forums :: View topic - slight miss/vibration at idle?
GarageGarage    1/4 Mile Table1/4 Mile Table    Forum FAQForum FAQ    SearchSearch    UsergroupsUsergroups   MedalsMedals
MemberlistMemberlist   ProfileProfile    Watched TopicsWatched Topics    Log in to check your private messagesLog in to check your private messages    Log inLog in 

slight miss/vibration at idle?

 
Post new topic   Reply to topic    NAIOA Impala Forums Forum Index -> 2000-2005 Engine, Exhaust and Transmission
View previous topic :: View next topic  
Author Message
billy101
Member Level
Member Level


Joined: Sep 12, 2010
Posts: 1704
Posts per day: 0.65
Location: Willow Spring, NC

2001 Chevrolet Impala
2010 Chevrolet Malibu


PostPosted: Sat Dec 17, 2011 5:36 pm    Post subject:  slight miss/vibration at idle? Reply with quote

hey guys, i dropped my cousin off at basketball practice today and was just sitting in my car waiting for 45 minutes and i felt my car almost seem to like hiccup or misfire a little bit just sitting in Park idling. no CEL, no codes, nothing...the rpms like to jump a little bit, from around 650-800ish just idling. the throttlebody is perfectly clean, new tps sensor, new idle position sensor (can't think of the real name), clean MAF sensor...the plugs and wires were done about 25k miles ago. something to worry about, or just leave it alone? i have been getting worse MPG lately if that has anything to do with it.

_________________
2002 Impala LS 3.8 -121,749 miles 11/13/2011
2001 Impala LS 3.8 - 118,510 miles. 9/2/2011. RIP - 11/12/2011
2010 Malibu LTZ 3.6 - 16,014miles. 8/20/2011.
Back to top
View user's profile Send private message
davidhoutz
Uber
Uber


Joined: Feb 28, 2008
Posts: 978
Posts per day: 0.27
Location: Clemmons NC

2001 Chevrolet Impala


PostPosted: Sat Dec 17, 2011 6:11 pm    Post subject:   Reply with quote

I had the same problem. Started to notice it over a year ago. Same clean stuff as you too. Never could figure out what it was and it never caused a problem. Had a new tranny and battery since then and still no change.

I notice if I raise the rpm's just a little, (foot on the gas) it won't do it.
Back to top
View user's profile Send private message
billy101
Member Level
Member Level


Joined: Sep 12, 2010
Posts: 1704
Posts per day: 0.65
Location: Willow Spring, NC

2001 Chevrolet Impala
2010 Chevrolet Malibu


PostPosted: Sat Dec 17, 2011 6:39 pm    Post subject:   Reply with quote

davidhoutz wrote:
I had the same problem. Started to notice it over a year ago. Same clean stuff as you too. Never could figure out what it was and it never caused a problem. Had a new tranny and battery since then and still no change.

I notice if I raise the rpm's just a little, (foot on the gas) it won't do it.


I just had my trans rebuilt too, brand new battery 3 months ago. I'm thinking it has something to do with my worn out dog bones rubber mounts, along with 125k mile motor and 180k mile trans mounts. I'm going to mention it to my dad and see what he says.

_________________
2002 Impala LS 3.8 -121,749 miles 11/13/2011
2001 Impala LS 3.8 - 118,510 miles. 9/2/2011. RIP - 11/12/2011
2010 Malibu LTZ 3.6 - 16,014miles. 8/20/2011.
Back to top
View user's profile Send private message
VictoryRed09
Forum Regular
Forum Regular


Joined: Jul 06, 2010
Posts: 263
Posts per day: 0.1


2009 Chevrolet Impala


PostPosted: Sun Dec 18, 2011 12:11 am    Post subject:   Reply with quote

It could be a injector getting a little dirty.

Try a bottle of injector cleaner, the next 2 times you fill up the tank.

It could be winter time gas. ( At least in my area, Gas is different this time of year )
Back to top
View user's profile Send private message Send e-mail
billy101
Member Level
Member Level


Joined: Sep 12, 2010
Posts: 1704
Posts per day: 0.65
Location: Willow Spring, NC

2001 Chevrolet Impala
2010 Chevrolet Malibu


PostPosted: Sun Dec 18, 2011 12:29 am    Post subject:   Reply with quote

VictoryRed09 wrote:
It could be a injector getting a little dirty.

Try a bottle of injector cleaner, the next 2 times you fill up the tank.

It could be winter time gas. ( At least in my area, Gas is different this time of year )


I know about the winter gas myths, so from december until april i run 93 octane fuel, and in the spring/summer/fall i run 89 octane. i actually ran injector cleaner my last tank, and did a top engine cleaning using seafoam about 200 miles ago

_________________
2002 Impala LS 3.8 -121,749 miles 11/13/2011
2001 Impala LS 3.8 - 118,510 miles. 9/2/2011. RIP - 11/12/2011
2010 Malibu LTZ 3.6 - 16,014miles. 8/20/2011.
Back to top
View user's profile Send private message
chibiblacksheep
Member Level
Member Level


Joined: Dec 14, 2009
Posts: 1369
Posts per day: 0.47
Location: Philadelphia, PA

2000 Chevrolet Monte Carlo
2007 Chevrolet Impala
1968 Chevrolet Camaro
2013 Chevrolet Camaro


PostPosted: Sun Dec 18, 2011 9:56 am    Post subject:   Reply with quote

billy101 wrote:
I know about the winter gas myths, so from december until april i run 93 octane fuel, and in the spring/summer/fall i run 89 octane. i actually ran injector cleaner my last tank, and did a top engine cleaning using seafoam about 200 miles ago


So you know they are MYTHS yet you waste your money on a high octane? They all have the ability to "freeze" so they will all have additives.

Just run a can of seafoam in the spring to help clean out your fuel system. I wouldn't run higher octane all winter.

_________________
Back to top
View user's profile Send private message Send e-mail AIM Address
billy101
Member Level
Member Level


Joined: Sep 12, 2010
Posts: 1704
Posts per day: 0.65
Location: Willow Spring, NC

2001 Chevrolet Impala
2010 Chevrolet Malibu


PostPosted: Sun Dec 18, 2011 1:56 pm    Post subject:   Reply with quote

chibiblacksheep wrote:
billy101 wrote:
I know about the winter gas myths, so from december until april i run 93 octane fuel, and in the spring/summer/fall i run 89 octane. i actually ran injector cleaner my last tank, and did a top engine cleaning using seafoam about 200 miles ago


So you know they are MYTHS yet you waste your money on a high octane? They all have the ability to "freeze" so they will all have additives.

Just run a can of seafoam in the spring to help clean out your fuel system. I wouldn't run higher octane all winter.


Well, yeah. Embarassed I figure if it is true, running it during the winter for an extra 60c per fill up really isn't that big of a deal. I know it sounds stupid, I probably could still run 89 and be fine, which I'll probably start doing anyways.

_________________
2002 Impala LS 3.8 -121,749 miles 11/13/2011
2001 Impala LS 3.8 - 118,510 miles. 9/2/2011. RIP - 11/12/2011
2010 Malibu LTZ 3.6 - 16,014miles. 8/20/2011.
Back to top
View user's profile Send private message
VictoryRed09
Forum Regular
Forum Regular


Joined: Jul 06, 2010
Posts: 263
Posts per day: 0.1


2009 Chevrolet Impala


PostPosted: Sun Dec 18, 2011 2:23 pm    Post subject:   Reply with quote

billy101 wrote:
VictoryRed09 wrote:
It could be a injector getting a little dirty.

Try a bottle of injector cleaner, the next 2 times you fill up the tank.

It could be winter time gas. ( At least in my area, Gas is different this time of year )


I know about the winter gas myths, so from december until april i run 93 octane fuel, and in the spring/summer/fall i run 89 octane. i actually ran injector cleaner my last tank, and did a top engine cleaning using seafoam about 200 miles ago

i guess you have covered my suggestion.

In North Carloina, Winter gas may be a myth.
In the Cold of Utah Wyoming, Idaho , Montana, it are not a myth. The first sign of winter gas is the 10% ethonal stickers are removed from the gas pumps starting in November and get replaced about the end of April.
Back to top
View user's profile Send private message Send e-mail
billy101
Member Level
Member Level


Joined: Sep 12, 2010
Posts: 1704
Posts per day: 0.65
Location: Willow Spring, NC

2001 Chevrolet Impala
2010 Chevrolet Malibu


PostPosted: Sun Dec 18, 2011 4:07 pm    Post subject:   Reply with quote

VictoryRed09 wrote:
billy101 wrote:
VictoryRed09 wrote:
It could be a injector getting a little dirty.

Try a bottle of injector cleaner, the next 2 times you fill up the tank.

It could be winter time gas. ( At least in my area, Gas is different this time of year )


I know about the winter gas myths, so from december until april i run 93 octane fuel, and in the spring/summer/fall i run 89 octane. i actually ran injector cleaner my last tank, and did a top engine cleaning using seafoam about 200 miles ago

i guess you have covered my suggestion.

In North Carloina, Winter gas may be a myth.
In the Cold of Utah Wyoming, Idaho , Montana, it are not a myth. The first sign of winter gas is the 10% ethonal stickers are removed from the gas pumps starting in November and get replaced about the end of April.


Yeah, I try to do everything possible to keep my car running top-notch, so I noticed this and I'm thinking maybe a possible fouled plug, or maybe a wire going bad...I'll just keep an eye on it and see if it progresses anymore.

_________________
2002 Impala LS 3.8 -121,749 miles 11/13/2011
2001 Impala LS 3.8 - 118,510 miles. 9/2/2011. RIP - 11/12/2011
2010 Malibu LTZ 3.6 - 16,014miles. 8/20/2011.
Back to top
View user's profile Send private message
IffyG
NAIOA Moderator
NAIOA Moderator
Silver Contributor (Amount: 1) Silver Contributor


Joined: May 19, 2007
Posts: 13731
Posts per day: 3.57
Location: Nashville, TN

2002 Chevrolet Monte Carlo
1998 Oldsmobile Intrigue
2009 Chevrolet Malibu


PostPosted: Sun Dec 18, 2011 5:27 pm    Post subject:   Reply with quote

I hate to say it, but it might just be the normal operation of the 3800. Both of my cars do this and I can't find any logical reason why they are doing it. I even mentioned it to the mechanic when the car was in the shop for the trans rebuild and he said his GP did the same thing.

_________________
helldorado wrote:
GLWTGFY. Big Thumbs Up

Dan wrote:
Protip: If you don't know what you're doing, don't do it.


d
Back to top
View user's profile Send private message
barnettimpala
Member Level
Member Level


Joined: Dec 26, 2010
Posts: 1328
Posts per day: 0.53
Location: Hawaii

2002 Chevrolet Impala
2001 Pontiac Grand Prix
2003 Pontiac Grand Prix


PostPosted: Sun Dec 18, 2011 8:46 pm    Post subject:   Reply with quote

My car does this too. But not just once. It just runs a little rough in general while idling. But if I turn on the ac, which raises the rpm, it runs perfect. And I have a 3400

_________________

2002 Impala- SSC, AGX, 18" charger R/t rims w/8mm spacers, Magnaflow cat, U-bend delete, flowmaster 80 series crossflow, z28 tips, HAI, debadged, 35% tint, smoked headlights, full sound system
Back to top
View user's profile Send private message
billy101
Member Level
Member Level


Joined: Sep 12, 2010
Posts: 1704
Posts per day: 0.65
Location: Willow Spring, NC

2001 Chevrolet Impala
2010 Chevrolet Malibu


PostPosted: Sun Dec 18, 2011 9:23 pm    Post subject:   Reply with quote

IffyG wrote:
I hate to say it, but it might just be the normal operation of the 3800. Both of my cars do this and I can't find any logical reason why they are doing it. I even mentioned it to the mechanic when the car was in the shop for the trans rebuild and he said his GP did the same thing.


Alright, guess I'll just have to live with it. It wouldn't hurt to change out my motor mounts though being as they're rather old, they'll probably get changed out rather soon.

_________________
2002 Impala LS 3.8 -121,749 miles 11/13/2011
2001 Impala LS 3.8 - 118,510 miles. 9/2/2011. RIP - 11/12/2011
2010 Malibu LTZ 3.6 - 16,014miles. 8/20/2011.
Back to top
View user's profile Send private message
IffyG
NAIOA Moderator
NAIOA Moderator
Silver Contributor (Amount: 1) Silver Contributor


Joined: May 19, 2007
Posts: 13731
Posts per day: 3.57
Location: Nashville, TN

2002 Chevrolet Monte Carlo
1998 Oldsmobile Intrigue
2009 Chevrolet Malibu


PostPosted: Sun Dec 18, 2011 9:41 pm    Post subject:   Reply with quote

If by motor mounts you mean the uppers, I can tell you putting in my MSP poly mounts made the studder/miss/whatever it is more perceptible to me.

_________________
helldorado wrote:
GLWTGFY. Big Thumbs Up

Dan wrote:
Protip: If you don't know what you're doing, don't do it.


d
Back to top
View user's profile Send private message
billy101
Member Level
Member Level


Joined: Sep 12, 2010
Posts: 1704
Posts per day: 0.65
Location: Willow Spring, NC

2001 Chevrolet Impala
2010 Chevrolet Malibu


PostPosted: Sun Dec 18, 2011 9:48 pm    Post subject:   Reply with quote

IffyG wrote:
If by motor mounts you mean the uppers, I can tell you putting in my MSP poly mounts made the studder/miss/whatever it is more perceptible to me.


I know my upper motor mounts are worn because the rubbers that attach to the physical motor brackets are loose, there is a good amount of play. I have the mounts flipped.

_________________
2002 Impala LS 3.8 -121,749 miles 11/13/2011
2001 Impala LS 3.8 - 118,510 miles. 9/2/2011. RIP - 11/12/2011
2010 Malibu LTZ 3.6 - 16,014miles. 8/20/2011.
Back to top
View user's profile Send private message
cooperaaaron
Cadet
Cadet


Joined: Jul 28, 2011
Posts: 53
Posts per day: 0.02
Location: Joliet, IL

2003 Chevrolet Impala


PostPosted: Mon Dec 19, 2011 12:07 am    Post subject:  My car did the same thing.... Reply with quote

a couple of days ago, I had changed out the C.converter and the light went out.

A couple of days ago, I was at a stop light and the car burped or missed, and the light came back on. I change out a bad coil and checked out the ignition control module, all was well. I might be having an issue with the grounds, I cleaned the one under the fuse box, and I understand there is one more with the starter, which I will tackle tomorrow. My MAF might be old, and I will change that out; I changed out my MAP sensor during the summer, so I know that's not the issue....
Back to top
View user's profile Send private message
Display posts from previous:   
Post new topic   Reply to topic    NAIOA Impala Forums Forum Index -> 2000-2005 Engine, Exhaust and Transmission All times are GMT - 4 Hours
Page 1 of 1

 
Jump to:  
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum

Powered by phpBB © 2001, 2005 phpBB Group
Forums ©
All logos and trademarks in this site are property of their respective owner. Comments and posts are property of the poster. All other content is © 2008 by the NAIOA.


Use of this site constitutes agreement with the NAIOA Terms of Service (TOS)


PHP-Nuke Copyright © 2005 by Francisco Burzi. This is free software, and you may redistribute it under the GPL. PHP-Nuke comes with absolutely no warranty, for details, see the license.
Server Local Time: November 23, 2017, 12:22:47 pm
Page Generation: 0.13 Seconds ( SQL 45:143 in 0.01 Seconds )