Author Topic: high revving when cold (Read 3109 times)

fisherman · « **on:** November 29, 2017, 06:52:47 PM »

On starting the wife's Fit/jazz revs at 1800 rpm, far to high in my book, anyone got ideas on how to moderate this behavior? When warmed up rpm is 600/700.

guest1372 · « **Reply #1 on:** November 29, 2017, 10:02:08 PM »

Fast idle when cold is specified as 1500 ±200rpm, warm 650 ±50rpm (manual) / 750± (CVT) so it's a little high initially. If your car has an electronic throttle body then this is monitored & controlled by the ECU although there are a bunch of sensors that could affect this.
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TG

fisherman · « **Reply #2 on:** November 30, 2017, 08:10:10 AM »

Thanks, so it would appear to be about normal.?

sparky Paul · « **Reply #3 on:** November 30, 2017, 09:04:59 AM »

It doesn't sound too far out.

Seems a bit odd at first. Ours sounds fast when it's really cold, but it's probably near the 1500rpm mark.

Jocko · « **Reply #4 on:** December 01, 2017, 07:00:59 AM »

Checked my tick over rpm this morning, using the ScanGauge. On initial start up it was 1600 rpm, but as soon as I was out of garage it settled at 1100 rpm (sitting for almost 24 hours, unheated garage - frosty outside). Once I was off on the road it dropped back to 900 rpm before blue light went out, and by the time I had returned back to the garage it had settled to a steady 790 rpm. I have no idea what it will settle out to when fully heated through, but I will check that tomorrow, after my usual 40 mile run over to Danderhall.
I have never paid a lot of attention to rpm as the Jazz rev counter, especially at low revs, could hardly be classed as a precision instrument.