Ok i read a post today about how IAT sensor fixed someone's high end miss. So i figured i would try it out. so i unplug the iat sensor. i run it through first and second gear about 3 or 4 times and it runs great. So i pull up to Mc Donalds and my friend was there. i tell him about it and he's like let me take a ride in it now, get in start it back up we go out well sure enough it's missing so i'm like great, my service engine soon light comes on which i figure was from the IAT being unplugged. Could it be possible when i first unplugged the iat my pcm didnt' notice and that's why it ran good and after a while the pcm found out and did something (i don't know what it would do) and then my car started missing and hesitating and all that stuff again?

 

Ttt....

 

just replace it to be safe, they are super cheap...

 

how long does it do that? till it gets warm?

 

Are you talking about when i pull the IAT sensor out? I'll try to explain things, with IAT Sensor in it'll hesitate/breakup no matter if the engine is warmed up or cold.

With the IAT sensor out it didnt miss at all until the SES light came on and it started missing again.

 

when did you last change your opti?

 

Can you scan and find out what the code is?

 

I don't think the opti has ever been changed. I have 56,000 miles on my car i figured it would last a little longer than that. I tried to scan my car the other day but they guy said it couldnt connect it just kept retrying connection

 

Same issue,
When the SES light came on in my car after removing the IAT, it cage code #23. Manifold air temp too low.

I replaced my sensor but was still seein gthe same funky readingon my scan tool.
It was showing 168F when the outside temp was 40, even when the car was cold, When the sensor is dissconected, it should show -40F, mine is showing 360F.....But Yeah, when the sensor is our, the car was running great. I put a new one and it's still running great.....still can;t figure out the funky PCM reading

 

I put a resistor in my plug to trick the pcm into thinking the plug is still plugged up. It been raining so i havent been able to test it but i think it may be dry enough tonight to find out. I'll tell you what i find out.

 

Well guess what my hesitation is all gone! At first i could notice it barely and i mean barely from 5500 to 6000 but now i dnt notice it any.

 

In my case it came again after few days, it was also miss firing in low RPM (below 2000)
I went ahead and bought a fuel pressure gauge and tested pressue. Guess what, it was 20PSI under load.
Changed filter, checked regulator and eventually chnaged the fuel pump (accel) car is back to perfect.