sc4canada

I took the car for emmisions testing and I saw on the sheet that the idle RPM was 733... I've noticed that too that my RPMs are higher (up to 1000) when the car starts and stay like that till about 2-3 minutes till they drop down to about 500 or less... is that something I should be concerned about??

BLK13X

Mine idles at about 700RPM (all readings off the tacho, so all rounded off...) when warmed up, but I've had instances where she's idled at 500RPM, 800RPM (no a/c operating), upto 1600RPM on first start up.

sc4canada

so it's normal?????? that wasn't the case when I first got the car that's why i'm asking

DIrEctQL

That is perfectly normal. It all depends on the temperature. If the weather is cold the car will start off with higher RPM until it warms up and drops to about 500 to 700 RPM (depending whats running, heater, A/C, etc etc). The max RPM the engine will go to with a cold start is 2000.

Use a search I belive this was dicussed to death before.

I observed the correct numbers via my Apexi S-AFC.

sc4canada

ok Thanks i'll search and see what I find but this happens even when it's under the sun in the summer with ac off.

VSsc400

iTrader: (1)

This is according to my S-AFC readout. I get pretty much these numbers 90% of time with very little variations.

This is on a 1992 SC400 with 85k miles

Idle with gear in Park 620RPM
Idle with gear in D position stepping on brake 565RPM
Idle with gear in D position with A/C @ 72degrees and fan @ 1bar blowing to feet and defrost 705RPM
Idle with gera in Park with A/C @ 72degrees and fan @ 1bar blowing to feet and defrost 715RPM

the maximum differences at each level is 20RPM at any given outside conditions.

sc4canada

do they drop suddenly after a few mins though? I'll go from 1100 to about 800 a few mins later suddenly down to about 500-or less with no AC or heat.

VSsc400

iTrader: (1)

those number I posted are after the car has warmed up completely.

When I cold start the car it starts @ 1250RPM until it reaches operating temperature. When it reaches normal operating temperature it idles @ those number stated above.

O. L. T.

iTrader: (17)

you guy's really haven't heard of a high idle cam before?

sc4canada

Actually no.. I haven't . I asked because this was not happening when I purchased the car so I thought there might something not right with it. Now from what I've read here I see that it's normal for the most part. If I'm wrong let me know.

Angel

On startup, my car idles at around 2,600 RPM.
Once warmed up, she idles around 950 RPM.

sc4canada

Yeah but Angel you drive a beast and a half

ciscokid

Idle for me is about 750-800

-CK

sc4canada

hey sisco heard that exhaust with the intake.. sounds smooth and sweet.

ciscokid

Thanks sc4canada. That combination works good for me as I'm a conservative kinda guy and wanted something subtle yet effective. Now if I was 20 years old again my tastes would probably be different.

-CK