Thread: high idling at startup in cold weather

Everything is working great except when startup after sitting overnight or about 4 hours at 40deg or less. I'm at 3000 rpm. My tps reads .68v when first turn key to on position. I made sure when I turned off the car it was at .47v. It drops down to .47v once engine is at about 140 deg. I can't fixure out if the ecu is increasing tps voltage at cold startup. Also I don't show any codes. When I hit the read code button it doesn't show anything, but can't tell if it the feature is actually working. Any input whould be much appreciated. I have very little tuning experience but learning. Thx. B14 with stepdown harness vvl, vvl maf, injectors, dizzy,

Check MAF? Usually that 3000RPM range is MAF territory?

Ya the maf is reading low when tps is .47v. It's reading lowest of .96v . It's regrounded so u think new maf would solve problem? I don't know what vvl maf should read at idol. Think the b14 maf should be between 1.3 and 1.8v

Sounds more like the "Idle Air Control Valve (IACV)-Air Regulator" which provides more air for fast idle when the engine is cold. If you can squeeze the supply hose shut when it happens, and the idle drops, that's where the extra air is coming from. The ECU simply reads the TPS and automatically adapts to changes in voltage caused by temperature changes.

Dave

This sounds more like a fast idle valve problem than anything and is pretty common with the VVL motors unfortunately.

The read codes function does not currently work in the RT version of the program. You can still read any stored codes by turning the knob on the ECU.

Ok Thx. Will check it out

The Sr20ve engine has a idle up mechanical adjustment just under the throttle. When using a sr20de ecu the ecu adds cold idle up to the idle control stepper motor, and the two together cause the high idle.

Undo the 8mm lock nut and use a 2.5mm ( i think) hex key to wind the center part in until the throttle is pretty much fully closed at a normal coldstart temperature. If you live somewhere where it can get super cold,then the valve will prob still open when its really cold, which might help bring engine temp up a bit faster.

Thx was looking at that the other day. Will adjust and let know if helps.

Tightened it down and got it to idol at 1500 right away with outside temp at 40deg . See how it does in the morning. Thx evlnxr!