Hey guys, got a strange issue popped up now that outside temps are warming up. Car runs great until full temp (180) then sitting in traffic it will go to 190 and then i try to go and it wont, wants to die and usually throws a P0507. Its almost clock work when it hits those temps. Mods, S3 HE, 50lb, 2.8, 3" catted DP, Aero scanguage, wideband, Dual pass Endplate, ZZP Can tune. It seems like limp mode, could this be due to hi temp?

 

P0507 Idle Speed High -PCM

could be a t plate problem

 

Is this your IAT2 or your coolant temp? My coolant is almost always 192 as I drive with this displaying all the time, I'm pretty sure most people with cobalts are around 180-190 all the time. Dunno anything about the code though, I'm a n00b.

 

Stock tune expect to see about 185 driving around. Sitting in traffic it will jump up till fans kick in but that is well above 190. If your IAT2 is 190 that is not good at all..

Just saw you have the aero, what is your IAT2/RPMS reading?

 

oh hell no, if my IAT was that high i would be effed. my IAT are around 65-85. my rpms are fairly normal

 

I've seen my IAT2's over 200 before..

damn ic pump.

 

I have too but I had a kink in my line

 

any ideas why it would barely run at certain temps, or what causes the P0507 code?

 

as in Throttle plate? i cleaned it 2 months ago.

 

just because you cleaned it dosent mean its still good you also should look into the pedal it also has alot to do with the t plate

 

iat and iat2 are alot diff, make sure your checking the right sensor!

 

so i can only read AIT on my PLX, how do i read ait2? is there already a sensor or what?

 

I cleaned my tb and messed up n cleaned plates also.
I get high idles and when mine hits 185 it runs like **** at idle.

 

What do you mean "and messed up"? im thinking bout upgrading my TB, any thoughts?

 

My car is almost always at 190 but I runs fine maybe cuz it's always warm in Miami lol

 

I always just used to spray the plates inside the TB with carb cleaner

But this time I used a rag and cleaned them up. Right after I get high idles n when it sits and raises to that temp it runs like crap. Sounds like it wants to die and goes extremly lean.
I guess your NEVER suppose to touch the plates inside the tb. Gets out of whack real easy

 

So whats the fix? new Throttle Body? ive heard you can get the blade relearned at the dealer but where i live the dealer wont touch this car....... sissies

 

Does any1 know how i can read AIT2 with the PLX DM-100/200 scanguage? im going nuts with this issue. I can see AIT but i guess 2 is the important one.