air temp sensor bypass. good or bad idea? my friend used a resistor to bypass my sensor. seems to knock out the CEL. runs perfect.. what do you guys say,... B18 c OBD1

 

You may have trouble if you experience weather changes.

 

i had it on my d series like this. the aF was always okay. what issues . symptoms can occur?

 

Well it's not able to read intake temperature... so when the weather changes it can't compensate.

Don't take a D series as an example. They don't flow much air to begin with. Either way, sounds like you have your mind made up. Good luck.

 

Keep in mind that the IAT is there for a reason, the ECU uses it for not only fuel, but ignition as well.

What bypassing it will do it really depends on what resistor you use, if you set the resistance to show the ECU that it's colder (to get more fuel) you'll likely get **** poor mileage, and more than likely less power.
If you set it to really warm (ie less fuel) you'll likely get decent mileage but run an good chance of running overly lean and possibly causing the EGT temps to get dangeriously high.

This is of course assuming you live somewahre where the temerature doesn't change. Running the car like it's 80*F when it's 20*F is going to cause serious problems. (and vice versa)

IMO, bypassing any engine sensor is risky unless you know exactly what you're doing and what it will change. (few people understand what the ECU is really doing, I'm still learning)

Tuning the maps and tables in the ECU will result in what you're looking for, and is not near as expensive as what you can cause by messing with the way the ECU+engine sees the world it's running in.

 

Keep the sensor, there isn't any reason why you would want to remove it. As the previous posters said you will start to affect the ecu's ability to compensate for outside air temp with fuel corrections, these corrections are minor the main problem is the timing corrections.