Before you get mad and think "another freaking post about the rough idle??!! Don't you search the forums first??!!" let me explain...
First, i have read probably every forum on here dating back 5+ years about the idle issue. And i've tried just about every suggestion i've come across, spare the major PITA ones. Second, i haven't crossed a description of the problem that quite matches what i've got yet, so i'm hoping someone sees something here that i'm not seeing.
Background -
just bought the car, 2008 Mazda 3i sport 2.0l with 119k miles, a few weeks ago and it's been doing this since i got it. But i've never owned one of these when it WASN'T doing it, so i'm not exactly sure what it's supposed to sound/feel like when it's running right.
Description -
When i start the car cold, it revs up to about 1500-2k rpms and slowly comes down to what i'd consider a normal idle of ~800-900 rpm's. After driving a bit and the engine warming up completely, whenever i stop the idle drops down to ~400-500 rpms and feels/sounds rough, no AC on. But it has never died on me, never thrown any lights or codes, and runs like a champ when you're actually driving and idle improves when in park or neutral.
What i've already tried -
New spark plugs (OEM replacements), new air filter, throttle body cleaning as per TSB instructions, purge solenoid valve clean with PB blaster, clean MAF sensor with CRC MAF sensor cleaner, ran bottle of injector cleaner through it, and did the disconnect the negative battery terminal let it idle and relearn process, dealer said there's no ECU reflash available for it.
Thoughts? I know it's been suggested to replace the PCV valve, but it's such a PITA to get to that i don't want to do it unless there's a good chance that's what it is. I'm about out of ideas though. Other than this frustrating idle issue, and needing to put new brake rotors on the front, i loveeee the car so far. Any help/ideas are appreciated!
First, i have read probably every forum on here dating back 5+ years about the idle issue. And i've tried just about every suggestion i've come across, spare the major PITA ones. Second, i haven't crossed a description of the problem that quite matches what i've got yet, so i'm hoping someone sees something here that i'm not seeing.
Background -
just bought the car, 2008 Mazda 3i sport 2.0l with 119k miles, a few weeks ago and it's been doing this since i got it. But i've never owned one of these when it WASN'T doing it, so i'm not exactly sure what it's supposed to sound/feel like when it's running right.
Description -
When i start the car cold, it revs up to about 1500-2k rpms and slowly comes down to what i'd consider a normal idle of ~800-900 rpm's. After driving a bit and the engine warming up completely, whenever i stop the idle drops down to ~400-500 rpms and feels/sounds rough, no AC on. But it has never died on me, never thrown any lights or codes, and runs like a champ when you're actually driving and idle improves when in park or neutral.
What i've already tried -
New spark plugs (OEM replacements), new air filter, throttle body cleaning as per TSB instructions, purge solenoid valve clean with PB blaster, clean MAF sensor with CRC MAF sensor cleaner, ran bottle of injector cleaner through it, and did the disconnect the negative battery terminal let it idle and relearn process, dealer said there's no ECU reflash available for it.
Thoughts? I know it's been suggested to replace the PCV valve, but it's such a PITA to get to that i don't want to do it unless there's a good chance that's what it is. I'm about out of ideas though. Other than this frustrating idle issue, and needing to put new brake rotors on the front, i loveeee the car so far. Any help/ideas are appreciated!