Welcome to the North American Subaru Impreza Owners Club Saturday August 30, 2014
Home Forums WikiNASIOC Products Store Modifications Upgrade Garage
NASIOC
Here you can view your subscribed threads, work with private messages and edit your profile and preferences Home Registration is free! Visit the NASIOC Store NASIOC Rules Search Find other members Frequently Asked Questions Calendar Archive NASIOC Upgrade Garage Logout
Go Back   NASIOC > NASIOC Subaru Models > Baja Forum

Welcome to NASIOC - The world's largest online community for Subaru enthusiasts!
Welcome to the NASIOC.com Subaru forum.

You are currently viewing our forum as a guest, which gives you limited access to view most discussions and access our other features. By joining our community, free of charge, you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is free, fast and simple, so please join our community today!

If you have any problems with the registration process or your account login, please contact us.
* Registered users of the site do not see these ads.
Reply
 
Thread Tools Display Modes
Old 07-05-2007, 12:43 PM   #1
Kev5n24
Scooby Newbie
 
Member#: 105711
Join Date: Jan 2006
Location: Vegas
Vehicle:
2005 Subaru Baja
Black on Black

Default Hiccup @ idle w/ AC on...

So just the other day I noticed while stopped at red lights around town only if I have the AC on (which is pretty much all the time here in Vegas), my Baja has a separatist hiccup. Yes a hiccup, you can actually feel it the whole car lightly jumps or rocks. I thought someone bumped into me first time it happened but no. Then I remembered all the older cars I've owned in my life that idled rough at a stoplight or even worse with the AC on, but it's not a continuous things, it's random and the RPM's don't dip below it's normal 750 they actually jump a little bit after the hiccup. I just put new plugs, wires, oil, and air filter in 2 weeks ago so I know it's not any of that.



...boy I'm so glad they checked everything 1K miles ago when I had it in the dealership just before the 36K warranty ran out. Now I'm at 37K and on my own...
* Registered users of the site do not see these ads.
Kev5n24 is offline   Reply With Quote
Old 07-05-2007, 01:56 PM   #2
Valhakar
Scooby Specialist
 
Member#: 39514
Join Date: Jul 2003
Chapter/Region: SWIC
Location: Avondale, AZ
Vehicle:
2003 WRX 2.5L Hybrid
Mostly Blue

Default

It is the AC clutch kicking in and the engine bumping the throttle to compensate. You should feel it in the AZ heat, you can actually feel it kick in at 55 MPH.
Valhakar is offline   Reply With Quote
Old 07-05-2007, 02:34 PM   #3
Kev5n24
Scooby Newbie
 
Member#: 105711
Join Date: Jan 2006
Location: Vegas
Vehicle:
2005 Subaru Baja
Black on Black

Default

well I've got 37K on the car and I've never felt it do this before so why would I feel the AC clutch kicking in now all of a sudden?
Oh and FYI, Las Vegas is in Nevada not Arizona
Kev5n24 is offline   Reply With Quote
Old 07-05-2007, 03:11 PM   #4
moonzie
Scooby Specialist
 
Member#: 128537
Join Date: Oct 2006
Chapter/Region: MWSOC
Location: Bloomington, Indiana
Vehicle:
2004 Baja Turbo
Red/Silver

Default

If you had your AC recently serviced or had freon added to the system then you may not have ever noticed it before because it may not have kicked on before. The compressor won't kick on unless there is adequate pressure (hence freon) in the cooling system.

And yes, with the exception of a few V6s and most all V8s - you will always 'feel' a slight tug or 'hiccup' as you described it in the system when the engine is idling.

If you recently had your dealership do a checkup they probably found your system was a bit low and charged it up to spec.
moonzie is offline   Reply With Quote
Old 07-05-2007, 03:21 PM   #5
Kev5n24
Scooby Newbie
 
Member#: 105711
Join Date: Jan 2006
Location: Vegas
Vehicle:
2005 Subaru Baja
Black on Black

Default

Weeeeeeeell they never put anything about an AC charge on the bill, it's not blowing colder like they did anything, and just to clirify this hiccup is happening like 6 or 7 times as I wait at a light, so say in 45 seconds. Sometimes 2 or 2 will come right one after the other then nothing for 20 seconds then it'll do it again once.
Kev5n24 is offline   Reply With Quote
Old 07-05-2007, 03:49 PM   #6
moonzie
Scooby Specialist
 
Member#: 128537
Join Date: Oct 2006
Chapter/Region: MWSOC
Location: Bloomington, Indiana
Vehicle:
2004 Baja Turbo
Red/Silver

Default

Wow.. Well it might be that you have a loose wiring connection somewhere and that's causing the compressor clutch to be engaging/disengaging erratically. possibly a bad clutch?

Minimum cycle time for your AC would probably be somewhere around 4-5 seconds I would think. The cooler the air going across your evap coil (cold side in the cabin) or the lower your fan speed, the smaller the cycle time will be on the compressor. Anything lesser than 4 seconds I'd say there's a problem.
moonzie is offline   Reply With Quote
Old 07-05-2007, 03:53 PM   #7
Kev5n24
Scooby Newbie
 
Member#: 105711
Join Date: Jan 2006
Location: Vegas
Vehicle:
2005 Subaru Baja
Black on Black

Default

Ya it's a problemo for sure but what I don't know. The air blows cold as it ever did so everything seems to be working fine as far as the AC goes. I mean it really rocks the car when it does this. Like I said I thought I got rear ended first time it happened.
Kev5n24 is offline   Reply With Quote
Old 07-05-2007, 04:43 PM   #8
bulwnkl
Scooby Specialist
 
Member#: 41070
Join Date: Aug 2003
Location: Arizona
Vehicle:
2005 Black Tiger
(Black Turbo Baja)

Default

I don't have quite this problem, but ours does sometimes shudder quite significantly at idle (like at a light or stop sign). It seems to reduce or almost go away once the engine is at full operating temp. Really not the same as what you're describing, but there is a similarity. Folks at USMB usually claim my condition is "normal," though no other Subie I've ever had has done it like this.

In any event, I doubt your condition is related to the A/C system. I wish I could guess what it is. The only time I've had anything like what you're describing, it ended up being a bad TPS (throttle position sensor) on a Dodge Shadow that would cause the engine to "shut off" for just an instant every so often as I was driving down the highway. Good luck!
bulwnkl is offline   Reply With Quote
Old 07-06-2007, 03:15 PM   #9
moonzie
Scooby Specialist
 
Member#: 128537
Join Date: Oct 2006
Chapter/Region: MWSOC
Location: Bloomington, Indiana
Vehicle:
2004 Baja Turbo
Red/Silver

Default

Quote:
Originally Posted by bulwnkl View Post
The only time I've had anything like what you're describing, it ended up being a bad TPS (throttle position sensor) on a Dodge Shadow that would cause the engine to "shut off" for just an instant every so often as I was driving down the highway.

*<- Deeply misses his late 92 Shadow, RIP.

moonzie is offline   Reply With Quote
Old 07-06-2007, 04:47 PM   #10
Kev5n24
Scooby Newbie
 
Member#: 105711
Join Date: Jan 2006
Location: Vegas
Vehicle:
2005 Subaru Baja
Black on Black

Default

I think you're right bulwnkl, its got nothing to do with the AC being in use. After further testing I've realized if I put the car in neutral it wont do it with the AC on, even after just having had a spaz attack in drive. If I'm on the gas in the slightest it doesn't do it either. Also I forgot to mention sometimes when I first start the car it sometimes dogs on take off like it's flooded, till I get going, then it clears out and takes off great. Gas millage isn't quite what I think it should be for city driving either...
Kev5n24 is offline   Reply With Quote
Old 07-06-2007, 06:21 PM   #11
Hawk296
Scooby Specialist
 
Member#: 14555
Join Date: Jan 2002
Chapter/Region: MWSOC
Location: Troy, MI
Vehicle:
1995 Impreza L
Baja

Default

Coolant temp sensor?
Hawk296 is offline   Reply With Quote
Old 07-06-2007, 10:20 PM   #12
moonzie
Scooby Specialist
 
Member#: 128537
Join Date: Oct 2006
Chapter/Region: MWSOC
Location: Bloomington, Indiana
Vehicle:
2004 Baja Turbo
Red/Silver

Default

Quote:
Originally Posted by Hawk296 View Post
Coolant temp sensor?
Extremely doubtful.
moonzie is offline   Reply With Quote
Old 07-07-2007, 06:21 PM   #13
Kev5n24
Scooby Newbie
 
Member#: 105711
Join Date: Jan 2006
Location: Vegas
Vehicle:
2005 Subaru Baja
Black on Black

Default

Ok new symptom today! I pulled into the garage and turned the car off, went inside but back into the garage in like 10mins to do some work and the smell of gas about knocked me over! Its not leaking anywhere that I can see. I looked under the hood and on the ground. Also I could hear it running back into the tank... WHAT THE HELLS WRONG WITH MY BABY!!!???!!??
Kev5n24 is offline   Reply With Quote
Old 07-07-2007, 06:39 PM   #14
Hawk296
Scooby Specialist
 
Member#: 14555
Join Date: Jan 2002
Chapter/Region: MWSOC
Location: Troy, MI
Vehicle:
1995 Impreza L
Baja

Default

Quote:
Originally Posted by moonzie View Post
Extremely doubtful.
Hey, its something that would cause over fueling. Just threw it out there.
Hawk296 is offline   Reply With Quote
Old 07-07-2007, 06:50 PM   #15
Kev5n24
Scooby Newbie
 
Member#: 105711
Join Date: Jan 2006
Location: Vegas
Vehicle:
2005 Subaru Baja
Black on Black

Default

would the check engine light be on if it were the coolant temp sensor?
...reason i ask is cuz mine isn't

Last edited by Kev5n24; 07-07-2007 at 06:59 PM.
Kev5n24 is offline   Reply With Quote
Old 07-07-2007, 07:10 PM   #16
bulwnkl
Scooby Specialist
 
Member#: 41070
Join Date: Aug 2003
Location: Arizona
Vehicle:
2005 Black Tiger
(Black Turbo Baja)

Default

You smelled raw fuel strongly? Sounds like a leak to me. If there are no external leaks, then I'd look for a leaking injector. You don't suppose you have one stuck open, do you? I'd have thought that would cause you a permanent misfire. Change your oil very frequently if you have a leaking injector (until you get the problem fixed, of course) because the raw fuel in the oil will tear the engine apart from the inside out.
bulwnkl is offline   Reply With Quote
Old 07-07-2007, 08:14 PM   #17
Kev5n24
Scooby Newbie
 
Member#: 105711
Join Date: Jan 2006
Location: Vegas
Vehicle:
2005 Subaru Baja
Black on Black

Default

Well there's no permanent misfire to speak of,.. just the occasional relatively violent hiccup when @ a stop light like I spoke of, but even that seems to be dissipating over the last 2 days. I did JUST fill up the tank and only had 20 miles on it before it was in the garage when I smelt the raw gas for the first time ever. If it doesn't persist throughout the beginning of the week ill assume it has to do with it's fullness. Still not sure why I'm getting the hiccup, the bog on take off when I first pull out of the garage, and the pour fuel economy though
Kev5n24 is offline   Reply With Quote
Old 07-09-2007, 11:13 AM   #18
Kev5n24
Scooby Newbie
 
Member#: 105711
Join Date: Jan 2006
Location: Vegas
Vehicle:
2005 Subaru Baja
Black on Black

Default

well gas smell has gone away, must've been something to do with the very full tank i had that day. still getting the hiccup though,.. and Ive typed hiccup so many times I'm now going to start calling it a heart palpitation just to break up the monotony.
Kev5n24 is offline   Reply With Quote
Reply

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


All times are GMT -4. The time now is 02:20 PM.


Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Powered by Searchlight © 2014 Axivo Inc.
Copyright ©1999 - 2014, North American Subaru Impreza Owners Club, Inc.