I have been having idle issues for a while now, but it usually only happens on a hot day. Now it has gotten so that my car is not driveable. If im driving and i engage the clutch or shift into idle. my car will drop to 750 to idle, then the car will die. any other time i have my foot on the gas. the car runs fine. accelerates alright, no loss in power at any other rpm so i dont think it could be a seal problem. i do have a little vibration at anything below 1500 rpms. my car seems to be running very rich. i thought it might be an ignition problem so i bought the mazsport ignition solution replacing the wires, ignition coils, spark plugs, and i even replaced the maf. my current setup that could possibly reflect these problems are racingbeat intake with cold air duct, underdrive pulley kit, magnaflow catback exhaust, mazsport ignition solution, and a optima yellow top battery. i just installed the ignition solution today. when i started it the first time, it was fine, every time i engaged the clutch or shifted to neutral, it idled perfectly. but after i turned off the car and started it back up again a few minutes later. it wouldnt hold idle again. when i first I do have a small exhaust leak right behind my cat at the gasket. i have bought the gasket but havent fixed it yet. the only thing i can think of to replace next is the rear O2 sensor because ive heard that the sensor also controls the fuel trim for the idle. when i replaced my spark plugs, they were pretty bad but still looked operational but still showed that my car has been running too rich. I know that some people have had fuel trim problems that have changed the intake system, but never heard of anything as bad as it not even holding idle. please any ideas will be greatly appreciated. ive tried almost everything.

 

Location?!

Also try posting in issues and problems forum.

 

I did. im just posting here too to see if people in my area can help out

 

Isn't bad idle on a hot day a symptom of low compression? I'm only guessing you are still within the 8yr/100k mile engine warranty, and if so just take the mazsport ignition (and maybe the RB intake) off and go to the dealer.

 

you have a loose plug wire, loose plug, bad coil or a vacuum leak...

and i would have to think a vacuum leak first..

beers

 

intake seals ...check them ...

 

I ended up taking it to my mechanic. they ran diagnostics on it and found out that I had one of the bad 04 engines. so I took it to the dealership and now am getting a new engine under warranty.

 

dang I have an 04, maybe mine will go bad so I can get a new motor........how many miles did you have on it when it started to go bad?

 

around 56000 when it started getting noticeable. and now im at 59500. the weird part is i still had power across the band, it was just the idle. but i cant complain about a new engine

 

I have 60k on mine and I have started to notice that when I first start it up it idles at 2k....is that normal?

 

My engine idles very strange on hot days and I notice terrible tq lag when accelerating from a stop. Does this sound like a new motor possibility? I have a 06 though :/

 

Everyone has that 'torque lag'..haha

 

Well i got my 8 back with the new engine, and while they were replacing that, i had them put in a new clutch cause my old one was shot. but the new engine definitely fixed all of my problems. the idle issues are gone, less engine vibration and noise and just all around better. it feels great.