Car Leans Out With Air Con On.

[Cristian]

Ive been doing a bit of tuning to my R33 and have noticed when i turn the Air con on the A/F ratio (only at idle) leans out to around 17.1 It is not effecting the A/F ratios anywhere else in the map. Has anyone else every experienced this problem or may know what is causing it?

Thanks

Cristian

[raz0r$harP.UK]

Power FC?

When you first install PFC you're supposed to run idle correction, eg 10 min with A/C on, 10 min with demister, 10 min with both (or something like that). If you didn't run it properly...?

[Cristian]

Yeah it is a Power FC.

So that could be the problem. Is there any way to reset the ECU so I can run the idle correction?

[rob82]

Power FC?

When you first install PFC you're supposed to run idle correction, eg 10 min with A/C on, 10 min with demister, 10 min with both (or something like that). If you didn't run it properly...?

<{POST_SNAPBACK}>

This is just a learning proceedure for idle control vavle. Its just a loop it performs until it determines what the optimal position of the vavle is to acheive the desired idle RPM. It just needs to learn 2 modes neutral AC on and neutral AC off. Its the same proceedure the AU fords use and if its auto it has 4 modes as in neutral AC off and On and Drive AC on and off. Note this proceedure doesn't have anything to do with mixtures.

Chances are you will pull more load with AC on so it look at what cell its on and check the cells around it as it might be interpolating around that cell.

Make sure you tune the with 02 feedback off and once your done turn it back on. Aim for stoic at idle. Drop me a PM if you need some more help.

Edited February 16, 2006 by rob82

[Sass]

what are you using to read the A/F

please don't say a turbo timer or af guage off the stock 02 sensor

[Sass]

if you dont perform the idle procedure correctly the car stalls everytime you try and start it

[Cristian]

what are you using to read the A/F

please don't say a turbo timer or af guage off the stock 02 sensor

<{POST_SNAPBACK}>

I am using an auxillary/external 6 wire wideband 02 sensor.

I have got all the equipment to log properly

[PHATR32]

arnt o2 readings usless at idle and only read at wot?