Post by
CanuckQx4 »
https://forums.nicoclub.com/canuckqx4-u160090.html
Sun Feb 26, 2012 2:38 pm
Basically my car idles to high. My iacv failed on me, and the car would not run, it would die as you started it. I removed the iacv and saw the end cap had broken. So I found one at the junkyard off a clean looking engine.
Installed it, and now my idle jumps to 2200 when I start the car, and when fully warm only goes to 1300. No big deal I thought, I figured I could simply do the Idle Volume Air Relearn test on page EC-60 of the FSM, which is fairly simple, but my car will not take to that test. When I get to step #7 which is:
7. Disconnect throttle position sensor harness connector (brown), then reconnect it within 5 seconds.
As soon as I disconnect that connector my idle shoots up to 2000rpm and surges (bounces) like its hitting a limiter over and over. And as I plug the connector back in, the idle only drops to where it was before, about 1300.
Is this an idication that something obvious is out of spec??
After failing to do that test several times, I started diagnosing, and diagnosis step #4 on EC-60 says to check THROTTLE POSITION SWITCH CLOSED POSITION, and the procedure for that without consult II ends up being page EC-108. I did the test with the multimeter and I was not within tolerance, my car showed continuity until the throttle was openned .013" (quite out of spec), so I followed the procedure to adjust it, and got it bang on, and verified quite a few times after tightenning it. I then followed the RESET THROTTLE POSITION SENSOR IDLE POSITION MEMORY procedure, on page EC-110 #12 which is quite involved with turning the key on and off 20 times, and I believe I did it right but theres no way to tell.....
Then again I tried the Idle volume air relearn test and it did the same thing where the rpms jumped and surged when I pulled the connector off.
I am hoping someone can help me diagnose what is going on and what my ECU is upto with this. Im hoping Im just missing something easy, or something needs to be reset. Im thinking of maybe disconnecting the battery negative overnight... but dont want to mess anything else up. Appreciate any help!!