Hi to all,
When cold starting my wife's Wave 2005, 1.6L, automatic, Ecotech II, 46000km (29000mi), the battery light stays on in dash panel. After a little kick on gas pedal (more than 1600 RPM), light goes off. Restarting the engine and battery light doesn't stay on... Was like this every days.
I began changing my serpentine belt because so many cracks were on it and I suspected alternator was not running at normal speed. Was OK for 10 days and then problem came back.
Then, I noticed on the first start when cold, motor never revs higher than 1400-1500 RPM before falling to idle speed half-a-second later at 1100 RPM. I put a voltmeter on the battery and noted 12.4V. After very light kick on gas pedal... 14.6V. So, alternator malfunction...???
I disconnected the alternator cable from the battery post and tested it thoroughly. I put the meter on the alternator connexion and I can reproduce the problem. After starting, when the alternator is not connected: 1.9V. Then I connect the alternator on the battery: 12.4V. After going higher than 1600 RPM : 14.6V. Always like that, cold or hot start... I think it's the normal functionning with the electronic regulator inside the alternator. It needs a revolution higher than 1600 (a certain amount in alternator revs) to switch the regulator.
I conclude the problem is with the level of the fast idle at cold start...1450 RPM... After the first start, fast idle always reach about 1700 to 1900 RPM and the charging circuit is OK.*
What's the normal fast idle speed at cold start?
How could I put it back to normal?
Have you seen a problem like this before?