Thread: Help! High Idle & Fluctuating idle

I'm having issues with my new motor I recently installed. SR20VE W/N1 TB & Manifold

It idles at 1800 RPM and then it will fluctuate +/- 500 RPM repeatedly.

-I've checked for Vacuum leaks for the high idle (I don't believe I have any leaks)

I believe my problem is one or more of the:

-IACV
-MAF
-TPS (how do I properly adjust this, hot/cold, ignition on/off?)
-TB

Any direction or experience of having similar issues would be appreciated.


The only thing difference from this motor than my last motor is that I added the N1 TB & manifold!

My last motor ran flawless, started right up after installing it and never had any issues.

Has no one had anything similar to this?

I've checked the forums and found similar issues, but most did not have a final conclusion or was a different outcome to my issue.

check the hose that goes to the IACV and check that your throttle has both butterfly screws, bad maf or wiring maybe

The TPS shouldnt cause your motor to fluctuate. My VE tps was pretty much dead and drove around like that for a few months before I realized that. Car ran fine but the throttle response was weak sauce.

had a similar issue years back, turned out I needed to adjust the cold idle screw on the TB

I know someone local that was having problems like this... he didnt have the cold idle coolant lines hooked up tho... maybe he figured it out by now...

@8ursi

I'm gonna hook my coolant lines up tomorrow.

+ 1 P10 goodness.
or tune?

Took some data logs in Nismotronics and sent them to john Kerr for him to look through and see if he can point me in the right direction. Gonna run some errands and then install the coolant lines to the TB.

Thanks for the replies!
I'll re-double check everything again, and change out my MAF with another one that I just picked up.