SaturnFans.com
what's new (beta) - classifieds - forums - photos


Go Back   SaturnFans.com Forums > Models > Saturn Ion > Ion Tech
Register FAQ Members List Groups Calendar Chat Room Search Today's Posts Mark Forums Read

Reply
 
Thread Tools Display Modes
Old 01-27-2008, 10:11 AM   #1
senorpineapple
Junior Member
senorpineapple is on a distinguished road
 
Join Date: Jun 2006
Location: Delaware
Posts: 35

2003 ION-2 Sedan
Default Idle RPM fluctuating

I've noticed something weird with my car.

I deliver pizza, so it's normal for my car to be run off an on for 8+ hours, 200 miles a day avg. I've noticed when I'm in someone's driveway, idling, after a few hours, the idle RPM's fluctuate about 100-200 RPM. Almost pulsing, like someone was slightly tapping the gas pedal.

Also, on highways, going a steady speed, foot at the same spot on the gas pedal, I can slightly feel the car push in those same intervals, like the gas pressure was pulsating.

It doesn't happen when the car's first started for the day, just after about 100 miles of driving for the day.

I'm thinking fuel filter/fuel pump? Compression? What could it be?

Edit: Oh yeah, '03 Ion 2 Auto with 120k miles.

REWARD EXCELLENCE!

Add to senorpineapple's Reputation
Rate the quality of this post and help senorpineapple reputation points. Click the reputation button near the bottom left corner of this message box. Thank you!
senorpineapple is offline   Reply With Quote
SaturnFans.com Sponsored Links
Old 01-27-2008, 10:16 AM   #2
fdryer
Super Member
fdryer has a reputation beyond reputefdryer has a reputation beyond reputefdryer has a reputation beyond reputefdryer has a reputation beyond reputefdryer has a reputation beyond reputefdryer has a reputation beyond reputefdryer has a reputation beyond reputefdryer has a reputation beyond reputefdryer has a reputation beyond reputefdryer has a reputation beyond reputefdryer has a reputation beyond repute
 
fdryer's Avatar
 
Join Date: Jan 2006
Location: NYC
Posts: 43,121
 

2003 L-Series 3.0L Sedan
Default Re: Idle RPM fluctuating

Replaced spark plugs lately?

REWARD EXCELLENCE!

Add to fdryer's Reputation
Rate the quality of this post and help fdryer reputation points. Click the reputation button near the bottom left corner of this message box. Thank you!
fdryer is offline   Reply With Quote
Old 01-28-2008, 08:15 AM   #3
senorpineapple
Junior Member
senorpineapple is on a distinguished road
 
Join Date: Jun 2006
Location: Delaware
Posts: 35

2003 ION-2 Sedan
Default Re: Idle RPM fluctuating

Yes, plugs were changed at 100k.

Here's something else I noticed. It has something to do with engine load.

It happened again last night, I had my car top sign lit, headlights on, radio going, and the heat on as well...

...as soon as I shut the heat off it stopped.

Is the high load causing this to happen or is this happening because of the high load?

REWARD EXCELLENCE!

Add to senorpineapple's Reputation
Rate the quality of this post and help senorpineapple reputation points. Click the reputation button near the bottom left corner of this message box. Thank you!
senorpineapple is offline   Reply With Quote
Old 01-28-2008, 08:29 AM   #4
fdryer
Super Member
fdryer has a reputation beyond reputefdryer has a reputation beyond reputefdryer has a reputation beyond reputefdryer has a reputation beyond reputefdryer has a reputation beyond reputefdryer has a reputation beyond reputefdryer has a reputation beyond reputefdryer has a reputation beyond reputefdryer has a reputation beyond reputefdryer has a reputation beyond reputefdryer has a reputation beyond repute
 
fdryer's Avatar
 
Join Date: Jan 2006
Location: NYC
Posts: 43,121
 

2003 L-Series 3.0L Sedan
Default Re: Idle RPM fluctuating

From your description, it may be the alternator switching on/off on the borderline between a fully charged battery and the electrical system drawing current while idling. That's my best guess for such a low change in rpm's unless someone else has a better handle on this. I wouldn't be too concerned at this point though.

REWARD EXCELLENCE!

Add to fdryer's Reputation
Rate the quality of this post and help fdryer reputation points. Click the reputation button near the bottom left corner of this message box. Thank you!
fdryer is offline   Reply With Quote
Reply



Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
RPM gauge fluctuating stroked383z 2008 Vue 22 02-09-2009 12:46 PM
95 SL1 SOHC fluctuating RPM when warmed up causes bucking when in gear, rolling idle Winder S-Series Tech 7 10-28-2008 08:55 AM
Hunting/fluctuating idle with A/C on Syncro S-Series Tech 4 06-03-2008 10:59 PM
Fluctuating RPMS at idle jamman S-Series General 10 05-14-2006 01:48 AM
High/Fluctuating Idle rotty_rott S-Series Tech 2 07-06-2005 12:38 AM


All times are GMT -4. The time now is 08:35 PM.

Advanced Forum Search | Advanced Photo Search


Powered by vBulletin® Version 3.8.9
Copyright ©2000 - 2019, vBulletin Solutions, Inc.
SaturnFans.com. The Saturn Enthusiasts Site.