350Z Help, car stalls when A/C is turned on...

NYSpeed Automotive
1

Friend here at work has a 350z which stalls on him pretty often.

I went outside to check it out, and it runs fine with the A/C off. If the car is idling and the A/C is turned on it will stall out. I did it about 5 times in a row. Give it gas and turn it on and it won’t stall.

When the car is first turned on the exhaust seems a little more poppy, might just be my imagination though.

Any ideas on what it can be? Just started happening after he hit a guard rail lightly.

2

Sounds like the compressor is binding up and difficult to turn

---------- Post added at 02:18 PM ---------- Previous post was at 02:17 PM ----------

maybe he kinked a line when he hit the guard rail, and pressure is building?

3

I looked the car over and didn’t notice any lines kinked I was looking at the compressor pretty closely too. I wasn’t sure if a binding compressor would cause a stall though, wouldn’t the belt just slip? No belt slipping at any RPM.

4

Yeah, I would think that the belt would slip before the car stalls

---------- Post added at 02:32 PM ---------- Previous post was at 02:31 PM ----------

Are there any vaccum lines to the A/C?

edit: I cannot find a vacuum diagram on google. Maybe MPD47 knows where one is on the intrawebs

5

Not that I saw, I tried looking over all the vacuum lines as well. I’m thinking maybe the jolt messed up the mass airflow sensor or dislodged something? Can’t seem to find anything looking odd though.

Oh and NO CEL!

6

Needs the Ecu reset, I have to do it every spring when I pull it out, idle air controller isn’t used to warm temps:

http://www.350z-tech.com/zwiki/Tutorial:ECU_Reset

---------- Post added at 06:28 PM ---------- Previous post was at 06:24 PM ----------

Also there is some similar method for reseting the throttle profiles google it, after I pulled my z out this year it stalled on every corner, reset everything and it runs fine

7

Yeah, I was going to say it sounds like an IAC issue. When you turn on the A/C it should up the idle to compensate. If it doesn’t, the car can stall.

8

Ended up being that the bottom of the air box had a huge crack in it.