jakesalter

Hi, is it normal that the idling on my car is around 2000 rpm for the first couple of minutes when started from cold?
Thanks
Jake.

pip

Yep

Lloyd Six

A little too high IMO it should be 14-1500rpm.

Start with the coolant sensor for the ECU, it works on a bio-metalic basis and sends resistantance value to the ECU to control the RPM when cold.

I would be confident on this if the car returns to normal revs when at running temp.

jakesalter

Thanks, also, restarting when hot, i've noticed the revs dip to around 500rpm or less as if its about to stall. It does this a couple of times then goes back to normal.
ECU reset worth a try maybe?

pip

Mine did the exact same thing and was also a 2003. It usually was about 2200rpm from start. It did also dip when starting from warm. Was never a problem.

NigelC

Mine always idles at 2000 revs when cold. I have been assured this is normal.

jakesalter

Reminds me of my old 205, thats always been terrible at idling.. You'd think on a car thats 19 years newer there'd be fewer gremlins!!

Lloyd Six

Sounds like a MAP sensor issue but an ECU reset wouldn't go a miss as it costs nothing.

jakesalter

Failing that, is it correct in saying that the map sensor can be taken off and cleaned?

Has anyone used 10k boost or similar on their S2000's, stuff that gets sucked into the air intake and cleans through?

Lloyd Six

Don't get spraying into it, TBH the MAP sensor is a VERY sensitive unit, it has an internal diaphram with flexes with manifold absolute pressure (vacuum) this again will send resistance values to the ECU.

There is a term called MAP-whack which involves tapping the unit but then how hard? Beaware that this can cause more hard than good and colud kill the MAP sensor all together. I advise only using a 13mm ring spanner and tapping lightly with the ring end. It becomes easier if you know what you are trying to achieve.

The diaphram within the MAP sensor over time will suffer because of deposits of carbon from the manifold. Tapping the sensor will clear an amount of these deposits and you will see an improvement but unfortunately due to the sensitivity of these units a new one will be required eventually.