What does a rough idle mean? I have 29,000 miles on my 2004. Could I need new coils and spark plugs? How often are you supposed to replace them?

 

could be:

1. plugs
2. coils
3. wires
4. cat
5. bad gas
6. clogged sock
7. bad MAF

some people replace plugs every 20k, some replace coils every 20-25k. Some people go 50k or more with plugs and coils.

 

I'm taking it to the dealership on monday. I told them it has a really rough idle, and another problem with the transmission being crunchy when cold...... almost like its grinding before it goes into gear.

 

AT or MT? Could be a bad engine mount.

 

does the car vibrate at idle? or does the rpm fluctuate?

 

It idles really rough, its a manual transmission and it seems to fluctuate a little as well..... how rough is rough if the engine mount is bad?

 

I am having the same problem. I had the engine mount replaced already but it still does it. 2005 m/t 25,000mi

 

engine mounts and reset the ac amp.

beers

 

Don't mean to hijack the thread but I have a similar issue. 2004 AT, 39k miles.

in December '08, weeks before my warranty runs out, I complained of a rough idle when in Drive and Reverse. The car shakes pretty violently in reverse, and in D when stopped it feels like a 20 yr old car, not a modern one. They did a flash, thinking it was a rough idle problem.

The problem didn't go away.

After doing some research and finding the TSB for engine mounts, I believe that is my problem. I took the car in a week ago, and they're saying it's out of warranty now and will cost $800 to replace. ?!?!

The local dealership has it documented that this problem occurred before December 31, 2008 (car was purchased Dec. 31, 2003). We have a 5 year warranty with the extension, right?

What can I do? This smells like BS to me. The dealership isn't giving me a hard time, he's waiting to hear back from Mazda HQ if they will do the work under warranty or not, but it's been a few weeks now. I don't think I'm going to get a call back.

 

mines not quite as bad as you all are describing. I think i am to critical of the car at times. I always want my stuff to work perfectly. I think the rx8 vibrates a little hard in general so maybe you all have an actual problem and im just creating mine in my head. if you have the extended warrenty i know mine is $100 deductible.

 

try the free stuff first. remove the plugs and inspect them for wear. remove the coils and inspect and test per fsm. thats a good start before taking the car into the dealer. if you remove those parts and are unsure about their condition, post a pic here and we'll take a look at them and help determine the problem.

 

I myself have an 04 A/T and I have an extended warranty but figured I'd just do the work myself. I bought the right side motor mount and replaced it in like 30 mins. I did plugs, wires, coils and motor mount last week. Completely different car now. The mount was the most noticable. The mount was $126. Hell if you were near me, I'd help ya, no charge.

 

An update: I just got a call from the dealership. MNAO agreed to give me the new mounts under warranty, but I still have to pay the dealership for labor, quoted @ $160.

I wonder if I can grab the parts and do it myself? Haha!

 

Thx for the offer. People like you are what make this forum awesome.

 

You said you took it in to the dealership on Mon - what was the outcome? I hope they still don't have it!

 

the dealer pretty much said nothing was wrong with the car when, even when i printed out the service bulletins about the clutch squeaking and the airbag rattle, and the engine vibration was supposedly "the nature of the beast"

 

oh and the fact that when my cd player is cold, you might as well not even try to listen to a cd.

 

I may be heading towards charlottsville in the next couple weeks. Maybe we can meet up and compare the vibration?