R33 Gtst Running Rich On Idle

[barnoon]

Hi guys,

Purchased a R33 Gtst last week, mods: fmic, 3" exhaust, power fc, z32 afm, bov, fpr. It's always been running fairly rich on boost which im not too worried about as when Unigroup Engineering re open i'm going to take it in for a tune, but what ive noticed now is that if you have the air con on the car will spew out black smoke constantly even on idle, as soon as you turn the air con off the black smoke goes away and it only returns on acceleration when the car starts making boost.

On the FPR gauge under the bonnet the car runs around 40psi with aircon off at idle and 45psi with aircon on, are these normal values?

Anyone got any ideas what could be causing it to run so rich all the time once air con is put on?

Thanks

[Moodles2]

When the aircon is turned on, the AAC opens up. The AAC probably needs a good cleanout as it could be letting in too much, or not enough air in.

[barnoon]

thanks for the reply, im trying to remove the aac now undid the 2 plugs going into it and took out the 2 bolts but it seems to be staying firm and not budging is there a special trick to get it out?

[barnoon]

never mind found a third bolt hiding around the back and once i removed that it came off and i cleaned it out with carby cleaner, yet to take it for a drive to see if its any better

[bluey33]

thanks for the reply, im trying to remove the aac now undid the 2 plugs going into it and took out the 2 bolts but it seems to be staying firm and not budging is there a special trick to get it out?

The trick is that there are 3 bolts holding it on

[89CAL]

BOV

If it is atmo it will run rich at idle because it will be partially open and not returning through the normal return pipe back into the system

Might have been tuned without the AC on so its fine until you turn the AC on

try at idle just holding your hand over the BOV outlet so no air can escape and see if that helps

Thats just assuming it is an atmo bov

Edited January 1, 2011 by 89CAL

[barnoon]

Thanks for the reply, I'm fairly sure my BOV is plumb back but I took a picture to be sure as i'm still learning

Also I should mention the car is terrible on fuel only getting around 250 - 300 kms per tank of bp ultimate

[89CAL]

yeah that is plumback so the bov should be fine

but they may not have tuned the idle with the AC on properly, but because I dont know who tuned it or anything like that, I'm not gonna slag on the tunning to much

try cleaning the AAC, and get some contact cleaner and lightly spray the sensor inside the AFM. Thats pretty poor fuel economy (unless your thrashing it everywhere)

I was fairly easily getting around 400km to a tank with my tune and the stock turbo, only mod i didnt have that u do is the FPR. That was giving it a bit every now and then

if all else fails take it back to your tuner and say your unhappy with the fuel economy and how rich it is at idle and see if they will have a look at it

[barnoon]

nah I dont thrash it ive been babying it as it blows too much black smoke when i give it a hit, ive cleaned the aac, ill give cleaning the afm a go tomorrow. other than that i think ill have to take it to a tuner to look at..

Edited January 1, 2011 by DMS87