300zx revvvss itself?

Post by **sdkid123** » Sun Mar 06, 2011 6:38 pm

hey guys so i changed the engine in my car and i got it to turn on but as soon as it turns on it rev's up to like 3500 rpm???I got soooo scared because the exhaust is off and its super loud soo i just shut it off lol

Anyways i set the tps to .45 and the cas is not set right but i want to get the rpms low before i set timmingt to 15 degrees so what can it be?

i heard the iav or something like that lowers your rpms or idle???

Post by **robomatic12** » Sun Mar 06, 2011 7:53 pm

Make sure neither the throttle cable or the throttle linkage are binding. Set the cas to the middle of the adjustment range. I'm not sure if the iacv can make the idle that high, sounds like something is wrong.

Post by **sdkid123** » Sun Mar 06, 2011 8:39 pm

robomatic12 wrote:Make sure neither the throttle cable or the throttle linkage are binding. Set the cas to the middle of the adjustment range. I'm not sure if the iacv can make the idle that high, sounds like something is wrong.

i disconnected the throttle cable to see if it was that and it wasent still reved up...what could be wrong?

Post by **es.biggs** » Sun Mar 06, 2011 8:41 pm

Double check for vacuum leaks?

Post by **sdkid123** » Sun Mar 06, 2011 10:52 pm

es.biggs wrote:Double check for vacuum leaks?

No I haven't because it to loud to hear and I don't want the engine revving up that high for too long:/

Post by **robomatic12** » Mon Mar 07, 2011 11:05 am

3500rpm isn't really going to hurt anything, it's a little hard on it if it's completely cold but you need to have it running to figure out if there are any vacuum leaks. or you could try using a boost leak detector

Post by **sdkid123** » Mon Mar 07, 2011 9:25 pm

robomatic12 wrote:3500rpm isn't really going to hurt anything, it's a little hard on it if it's completely cold but you need to have it running to figure out if there are any vacuum leaks. or you could try using a boost leak detector

Ima put the exhaust back on so it won't be as loud and do that but also can maybe the iac be stuck open or something making the rpms rise? I can't think of anything else other than that... the car starts right up but as soon as it stars it revs its self?.. is it easy to swap the iac without taking the plenum off?

Post by **sdkid123** » Tue Mar 08, 2011 3:51 pm

Fixed it it was the iav that was like half way open took the one of my old engine and it shot up to 2000 rpms but dropped right away to like 1200 now I just need to adjust it but timming comes first!!!

thanks for all your help I love NICoCLub

Post by **robomatic12** » Tue Mar 08, 2011 7:02 pm

Nice, glad to hear you got it sorted!

300zx revvvss itself?

300zx revvvss itself?

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