Bad spark plugs, bad eng coil or my Z4m is allergic to hot weather?

[JeffchaPz]

Hello everyone... well, about a month ago after driving the car for few hours here and there.... in a 90 degree temp, the RPMs would drop a little while waiting for the light, then at a diffrent light... the engine stopped. It actually happened about 3 different times on different days.... but now it seems fine although I haven't been driving when the temp is above 85 or so so I don't know if I should order new coils or spark plugs.... or ignore it. what gives?

[seank]

I am pretty sure that it is not coil or plugs. I have never heard of them being affected by temperature. I would check things that are affected by temperature, like water temperature sensors.
Just my .02 cents but what do I know.

[JeffchaPz]

True true.... now I'm thinking if I had picked up some sore of bad gasoline. I was planning to remove the plugs to see if anything looks abnormal.... but the phreaken car runs fine now. Now, when I'm at a light I'm constantly paying attention the RPM needle.... I guess I'm paranoid.

[dreamingat30fps]

I've had the same issue posted about it here:
http://www.zpost.com/forums/showthread.php?t=656319

Seems a lot of people have experienced this.

[JeffchaPz]

Hummm ok, so others have the same problem but no one knows what causes it.

[MHeavNC]

I blame ethanol,...for pretty much everything that I can't figure out... Lol..!

[RichardTS]

Originally Posted by JeffchaPz

Hello everyone... well, about a month ago after driving the car for few hours here and there.... in a 90 degree temp, the RPMs would drop a little while waiting for the light, then at a diffrent light... the engine stopped. It actually happened about 3 different times on different days.... but now it seems fine although I haven't been driving when the temp is above 85 or so so I don't know if I should order new coils or spark plugs.... or ignore it. what gives?

I have had this when temps in the mid-90's in LR. Mine had all the symptoms of heat soak (idling at a long light when it is hot causing the engine to run rough and sometimes stall). Sometimes you need to blip the throttle so that you can get some cooler fuel in the runners.

Might also be heat exacerbated by ethanol.