2008 Mazda3 with Rough Idle

Well, the dealership had it for 3 days and told me they could find nothing wrong with it. The engine light came on finally and the code read that it was a bad fuel cap so they replaced that, but still having issues with the rough idle. They even drove it around with the computer on it but I guess now I just have to wait and see what happens.
 
Well, the dealership had it for 3 days and told me they could find nothing wrong with it. The engine light came on finally and the code read that it was a bad fuel cap so they replaced that, but still having issues with the rough idle. They even drove it around with the computer on it but I guess now I just have to wait and see what happens.
Fun times! From personal experience, I would not trust the dealer when they say they drove it around. They probably just ran the engine at idle on the lift or in a bay with the computer hooked up...if they even did that.
 
I am getting the same thing as pretty much everyone else on here. My car will be idling fine at stop signs/red lights and then all of a sudden a rough bump or even a series of bumps. The AC makes it even scarier to the point where I turn off my AC when idling now because of it. (unamused)
 
me to....

i have a 08 mazda 3 2.0 and that happened to me to. i start my car up when its cold and it idel's rough... almost like studdering. anyways it was so bad that my check engine light turned on and they had to recalibrate my intake manifold threw a computer. after that it was ok. have them do that to yours and it should be good!
 
soo aggrivated!

I have an 08 m3 2.3 and less than a month ago i began having issues with the car starting. one morning it would not start at all. i had roadside assistance come and take the car to the dealer- he could also not get the car started. when they took it to the dealer they called me and said "car starts fine, you can come get it" i told him i wasnt coming to get it- there was clearly an issue. he agreed and said they would "check everything". i didnt hear back all day- the issue began at 7am and it was now 4pm. when i called back he said they wanted to let it sit overnight to see if they could duplicate the problem. i asked for a rental and they told me no because since they didnt know what was wrong- i dont qualify for a rental. only once i fought back did they decide to give me one and said they would call me the next morning- which was a saturday. all day, no call and they didnt return any of my calls. they were closed sunday, so i called monday. they stated that they had no ide what was wrong and that they still could not duplicate the problem, but hopefully "this week". Then i got a rude email from the service manager stating they had gone above and beyond and couldnt find anything wrong and they had one of the "top 10 mazda techs in the country look at it". he told me to come get my car and bring theirs back. i went and got my car and then had my 20 yr old brother, who isnt even a mechanice (he does autobody though) look at it. He popped the hood and removed the engine cover and there was a huge nest right under the cover. now i was really angry because the told me they checked everything, including the coil packs, which are under the engine cover. so basically they checked NOTHING. i brought the car back again, they cleaned the engine and did all of that. 2 weeks later (this past monday) i started the car and it immediately stalled. i thought i must have taken my foot off the clutch, started it up and it ran fine. then i came to a stop light on my way to work and it stalled. i started the car again, went to the next light and again it stalled. i brought the car back to the dealer yet again and left it for them to look at in the morning. they then called me back the next day and told me they did get the car to duplicate the issue and it stalled at 3 of 6 stop lights. they stated that the throttle body was getting stuck closed or not opening all the way. they stated that this is not something that is replaced, but serviced. they stated that they cleaned it and it is working fine now, but they wanted to keep it for another day. now i did my own research and everything that i find says they DO replace them and people who have been told this is the issue started having the problem again about a month later. i told the guy that i found this and he said that i must be wrong... i am coming up on my 1 year and i dont want to get screwed over here... any suggestions? the dealership treats me like i am some stupid naive girl... im fed up!
 
I am getting the same thing as pretty much everyone else on here. My car will be idling fine at stop signs/red lights and then all of a sudden a rough bump or even a series of bumps. The AC makes it even scarier to the point where I turn off my AC when idling now because of it. (unamused)
Sadly, that's the way the idiots that built the car designed it.
 

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