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Discussion Starter · #1 ·
Hey all need some advice

I recently started noticing that my Mazda 3 2005 2.3 was not starting as enthusiastically as it used to. I ended up changing out the battery just cuz I haven't changed it in almost 5 years. After putting in re new battery it began starting up quicker/nicer. But now I am idlng very low. I used to idle at like 850-950rpm and now I idle 750 and below and I feel the car shake as the needle kind of dances between 500 & 750. And the other day it actually stalled. I brought it into the dealership who said that the CPU brought back no problems/errors. I have a CAI and custom exhaust. What do u think it can be? Dealership will not help me sent me away saying they see no problems and idle at 750 is normal. I really don't know what to do and I don't want to prolong this and hurt my car further. Thank u very much in advance!
 

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The car is suppose to idle at 750. That is normal for it. 1k seems really high except for on a cold start. But once it is warmed up it should be at 750. now 500 is way to low and will stall you out. Have you checked your MAF wires? One or more of them may be pulled. Also, have you tried running some fuel system cleaner through your car? Mine was having the same kind of issue but mine never sits at 1k at idle. I ran seafoam through it and it starting running like a brand new car again :)
 

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Discussion Starter · #4 ·
None. Although earlier while it was jumping between 750-500rpm it dropped just below 500 and the check engine came on but I revved it a bit and it went off and didn't stall. But probably would have if I didn't rev.
 

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Discussion Starter · #5 ·
Prototype.. Thanks for the quick response. I'll try the fuel cleaner stuff. Now I am really not to savvy with cars. The MAF wired I'm assuming will be located on the sensor that is on the CAI? Also. uve seen a CAI on a 3. LOL it's like a snake trying to hide up in my car. I'll look into it. Thank u again. But if not that any other ideas? What's the fuel cleaner u used?
 

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[quote author=prototype99 link=topic=136112.msg2931722#msg2931722 date=1234454350]
Also, have you tried running some fuel system cleaner through your car? Mine was having the same kind of issue but mine never sits at 1k at idle. I ran seafoam through it and it starting running like a brand new car again :)
[/quote]

I agree, try Seafoam. It's inexpensive and might do a lot of good if you haven't done any fuel system treatments in the 5 years mentioned above.

http://www.mazda3forums.com/index.php?topic=111632.0
 

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Discussion Starter · #7 ·
just told me they replaced the throttle body to get rpms back up. Soooo guess I'll see I'm at the dealership now LOL god bless the iPhone. I'll update soon. Thanks again.
 

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My car idles @ 500, it never feels like it wants to stall.
It's never staled, I would say its the intake thats making it do that.
Before I put my CAI, it would stay around 750, now it sits at 500.
 

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check your maf wires. My gf had the same problem. They said one of the maf wires pulled lose from engine movement. She has a AEM cai if that helps.
 

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Not sure if you have an EGR valve or not, but I just cleaned mine for the first time...on a Protege5 since my car out of nowhere stalled to the point it was cutting off...what a difference...feels like a new car...
 

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Discussion Starter · #11 ·
thanks for all the suggestions guys! .. the car seems okay now after the dealership .. its idling steady at 750 .. buuuuuut .. now its like a reverse effect whereas before it was idling too low .. now, while im driving and im coming to a stop, as im stopping.. and when i stop it stays idling at like 1,250 - 1,500 which actually sounds as if i was revving it a little bit ... lmao! in any case its not stalling any more haha! it eventually kicks back down to 750 tho and no lower
 

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They probably just reset the battery while fixing it. It will stop doing that once the ECU is done relearning its fuel trims. Glad it's solved :)
 

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What did the dealer replace as the fix for this?
 

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Discussion Starter · #14 ·
they said they replaced the throttle body ... *shrug* .. when it idles like still at a dead stop it idles nice at 750.. but its odd.. .. ok i'll give you the virtual experience.. your driving.. regularly.. comin up to a stop sign so you kick it into neutral and let it glide, heavenly, and as its still rolling (while in neutral) its at 1500-1750 rpms and sounds as if im revving it myself. its not until i come to a dead stop that the rpms drop down to 1000 then to 750 slowly.. its a little annoying.. dont think its really harmful (and hopefully gets fixed over time) cuz its just the car readjusting to a (reset battery if they did) and also the new throttle body .. kind of like a person would be with a organ transplant im assuming..
 

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i idle at 650... sometimes dips to 600 or 700.. but between 670-630 all the time
 

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anyone know if they can do an idle air volume relearn? i am a nissan mechanic and on nissans with E-throttles we do an idle relearn as well as clean out the throttle body.

"blindchild" if you dont mind, please take a look at your repair order and see what all is listed on there. i would imagine some sort of "relearn" is present. i am just curious.
 

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Very interested in this, as i have the same model/year car(auto, though) and it does exactly the same thing.

It threw a CEL once and it was the maf sensor, so i switched back to the stock intake, reset ecu and it went away. for awhile. Now it does it occasionally and usually only when it's hot outside.

I've checked the maf wires and they're not loose. My next step was going to be replacing the maf sensor, but if it's the throttle body causing the problem, i'll check that first.
 

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Try a fuel system cleaner like seafoam. Will probably fix the problem. If not then you probably pulled one of the wires on your MAF. When mine was acting up (right before I extended the MAF wires) I couldn't tell if the wires were pulled or not but with the motor running just a slight tap or wiggle of the wires would stall the car. Cut the whole harnass off and re-did all the wires and was back in business without any issues. Knock on wood....
 
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