Why Does My R33 Hate Air Con?!

[Emrarrr]

Hey All,

I have a 1996 R33 Series 2 which hates having the air con running! I have noticed that whenever it is on the car seems to miss on idle, kind of feels/sounds like it runs on three cylinders for a brief second. When the air con is off idle is perfect and I have no issues. Does anyone know what might be the cause of this? I had an ac idle up valve problem in my GT4 so am wondering if this might be the cause?

Any advice on what to investigate would be greatly appreciated I do have broken manifold stud bolts which are being taken care of this weekend but not sure if that is contributing in anyway.

Thanks

Em

[danny14]

Hmmm without having a look could be a few things maybee iac valve . And the studs could have something to do with it if its sucking air sounds like idle control though from a sparkies point of view

[Sinista32]

A/c drops idle speed - maybe in the tune if aftermarket ecu

[Sparks]

My 34 hates having the air-con running too. For some reason it effects the way my clutch engages? makes it

very difficult to shift and I also get the odd effect on my idle too, only drops rpm slightly but you can feel it stumble through the whole car.

I haven't got a clue whats wrong with it. The aircon is super cold and it still revs out okay.

[Emrarrr]

Thanks guys! Cleaned the iac valve etc. Actually ran diagnostic codes and found out water temp sensor is faulty and for some reason the cold start valve wasnt even connected properly! Hopefully those things fixed will help at least! Haha weird isn't it re ur R34? Mine feels like it almost drops a cylinder occasionally on idle!

[Sparks]

So did those things fix the issues? I might have to look into those myself.

[Elegant Skyline]

At least this is better then my old Honda, when the A/C comes on it sounds like a half dying cat and the POS gets jumpy back and forth.

[Emrarrr]

Hey Sparks, damn not yet! I actually cleaned my coolant temp sensor n the code went away- weird!! But it's still idling like ass now without air con haven't tried with air con tho! I assume worse lol. I did mess with the idle screw but it was shit before then. I'm wondering if throttle body or TPS maybe?

Hahaha ok well your Honda story makes me feel a bit better!

Sucks cos the car drives absolutely perfect otherwise