inlet air temp sensor?

Question

I know the IAT sensor is at the inlet manifold but exactly where I need detailed instructions or a photo The car is a 2005 Rover 25GLI

Answer 1

Hi

I guess you are intending to bypass the IAT sensor with a resistor to supposedly increase perfomance? If so then please read on:-

All the sensor does is fool the ECU into thinking that the intake air is cooler than it actually is, and therefore more dense, and the ECU's reaction to this is to increase the fuelling slightly.

Unfortunately though, the intake air IS NOT cooler and IS NOT denser and therefore all you get is an overfuelling condition which will WRECK your catalytic convertor.

If your vehicle is not fitted with an oxygen sensor, then the resistor will work constantly, but your vehicle will be overfuelling and possibly illegal due to the emissions, not to mention the increase in fuel consumption.

If your vehicle is equipped with an oxygen sensor, then the resisitor will only work whilst the engine is cold.

This is because once the engine has warmed up, the oxygen sensor will detect the lack of oxygen in the exhaust gases, which is caused by the extra fuel being injected courtesy of the resistor, and it will immediately start to switch high and this will cause the ECU to turn the fuel back down to normal again.

In a nutshell, the resistor will only work whilst the engine is cold on oxygen sensor equipped vehicles, and all it does is cause over fuelling which will very slowly wreck the catalytic convertor.

The extra fuel in the injected mist will serve to rinse oil from the cylinder walls and cause slow but progressive premature engine wear, which will be more prominent in non-O2 equipped vehicles because they are overfuelling constantly if the resister is fitted.

All vehicles with a catalyitc convertor are fitted with oxygen sensors, which includes EVERY SINGLE VEHICLE from late 1993 onwards (late K reg) without exception.

This is not scare mongering, it is all very true, so fit them at your own peril and don't say I didn't warn you.

You would get a better response from a cold air induction kit which DOES induct cooler, denser air, and therefore the vehicle will not over fuel. The O2 sensor will sense the EXTRA oxygen rather than the LACK of oxygen and instruct the ECU to turn the fuel UP not down so that it was matched to the density of the cooler intake air and the emissions will remain at a legal level if your vehicle is not fitted with an O2 sensor.

Do you REALLY expect a power increase for £6 or whatever you paid? I think not!!

Cheers

Geordie

Answer 2

This sensor tells the computer what the air temp is coming into the motor. It is located either on the air filter box or shortly after. It can have a number of wires. Most have 2-3.

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Answer 4

if you are replacing it, get the new one and replace the thing that looks like it.