I agree the car is very temperature sensitive. Here in Texas we often have days over 100F and it really can make a difference. But why do you think there is a problem with the IAT sensor? I certainly have seen reduced performance and occasional low idle in hot conditions but don

 

agreed...I don't know if the sensor is faulty or our car is just overly sensitive to the heat...I'd vote for the second. And we can remedy the latter in several ways.

 

From my understanding of the diagnosis given to me by our head technician, the IAT sensor intermittently goes out of range. Let's say it is designed to measure a value from 1 to 10. It sometimes gives a value of 12 which is out of spec. I dunno, I'm not really too sure about the intricacies of the ECU but this was the read-out made by the OBDII scanner.

Remember, the stalling, bog, hesitation and stumble only happens to me when the temperature is very very hot. Like bumper to bumper traffic at noon time. Possibly the hot exhaust of cars in front of me gets sucked in by my S2 which further increases intake temperature. Also, when the car does stall, restarting is not a problem nor is revving the engine and keeping it at a constant rpm of let's say, 1500rpm as not to bog.

But the moment I let go of the accelerator, the stumble begins a new. I believe relocating the IAT sensor should solve the problem, perhaps bypassing it using a resistor should work. Unfortunately, I do not know what ill effects this will do to the car.

 

Hmm... Even in 110+ degree days here in Texas I don't have any issues with stalling or stumbling.

The only times I've heard of people having issues like you describe, it's been the MAP sensor.

 

I've swapped MAP sensors with a CRV. My stook still stumbled, the CRV didn't.

I have no problems with my stook except this stumbling thing during very hot days. Perhaps the air here is much thinner. I really do not know. It's not a clogged fuel line, it's not a faulty spark plug either. I can restart the car 20x times over when it stumbles and dies. Shifter has never grinded, the car pulls like mad when into vtec.

The check engine light pointed to the IAT sensor. After resetting the ECU, the check engine light does not come on again. Problem is intermittent. Which makes me believe that it is a characteristic problem of the vehicle.

 

my computer threw an exception on the IAT sensor as well. funny thing was it happened the morning after going to the track...but the air was cold! it didn't occur the day before at all. once we reset it it hasn't come back.

 

How many 110+ days have you seen in Texas. To me this is the coolest July and August in years.

 

None this year, but more than enough last year.

 

Tmkarab,

Your description of the clutch sticking even when the clutch pedal is fully depressed is also a characteristic problem of this car. Mine occurs more often when going reverse. The cars doesn't stall in this scenario, it merely shudders as if the car wasn't given enough gas as the clutch is released. In this case, the clutch wouldn't be engaged since the pedal is all the way in. I doubt if the problem is the clutch itself.

I believe, it still has something to do with the IAT sensor giving the car difficulty in idling, thus, the perception the clutch is still sticking.

 

I just experienced this yesterday (very hot and humid here). The car was warm and I started it to leave a parking lot. While I was sitting in the drive waiting to pull out, it stumbled and died. I restarted, and it happened again. I restarted again and gave it some extra gas to keep the idle up, pull out, and got the car some air. By the next light it was fine. I plan to have this looked at sometime this week. Keep me posted if someone finds the culprit.