General Question: Idle during warm up?

[ToroGTS]

Does the GTS ECU increase idle speed during warm up on skylines? Where does yours typically idle when cold?

Mine seems to idle at about 800 rpm at all times, despite resetting base idle to spec using the manual.

[Voodoo_ChildR32]

Both gts's I've owned always idled around 750-800ish. I think you're good.


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[Skym]

Does the GTS ECU increase idle speed during warm up on skylines?

From what I can remember, it starts at around 1250rpm and goes down to 650rpm when engine is warm. ECU can make engine idle higher than 1250rpm, run richer on very cold days (when coolant + water is colder).

Where does yours typically idle when cold?

Mine is around 1250-1300rpm, depending on coolant + water temp.

Mine seems to idle at about 800 rpm at all times, despite resetting base idle to spec using the manual.

You need Nissan's Consult (handheld diagnostic computer) or Nistune to reset idle properly, as get accurate rpm readout. It should drop from 800rpm and idle at around 650rpm if engine idles for a long time and is warmed up. Also it should initially sit around 800rpm after starting engine when warm.

ECU can raise idle rpm if turn steering wheel or turn on aircon, light's, etc (raises idle to around 1000rpm).

[ToroGTS]

Given my lack of normal idle response to cold condition and drivibility issues before full warm, I tend to lean toward a ECT issue. Although my ECT gives normal resistance readings over the temp range..... Is it possible that it is defective despite this?

[Skym]

ECU pulls ignition timing up until certain coolant temp is reached or if you rev engine over around 3200rpm it switches out of this warmup mode, etc. You can adjust these settings via using Nistune. Also runs engine richer. If engine is modified, these settings are usually out and need to be retuned.

As far as I know, coolant temp sensor usually produces coolant temp sensor error code on ECU. But sometimes sensor is not out by enough to produce error code on ECU. I found this with TPS that was faulty, but ECU says it was ok. It is recomended to check sensors via multimeter or oscillioscope if ECU doesn't show any error codes. With Nistune you can datalog sensor voltage, ignition timing, etc while driving, so is alot easier to diagnose problems.

Sometimes faulty TPS is the cause of drivability problems (Have replaced 2x TPS so far on my car) or dirty MAF (clean with CRC MAF cleaner), faulty solders on plug side of circuit board inside square part of MAF.