Does high idle at start-up cause wear?

[pbm]

I had disconnected a vacuum line to reach my O2 sensor. I neglected to reconnect it and when I started my car (cold...approximately 70*F outside) the next day it immediately surged to approx. 3500 or 4000 rpm.
Would this cause wear on an engine that hadn't run in about 20 hours OR does oil pressure come up immediately keeping wear to a minimum? Thanks in advance.

This is a GM 3.1 OHV.

 

[Lead Shoes]

I wouldn't lose any sleep over it, the increased wear was likely very minuscule..

 

[Klutch9]

I wouldn't worry about it. Many, if not all PZEV cars rev quite high upon startup to heat up the emissions system quickly. My PZEV Focus, for example, almost always revs close to or at 2,000 rpms for the first few seconds, and sometimes even jumps a tad above 2,000.

 

[Josh48065]

Originally Posted By: Klutch9
I wouldn't worry about it. Many, if not all PZEV cars rev quite high upon startup to heat up the emissions system quickly. My PZEV Focus, for example, almost always revs close to or at 2,000 rpms for the first few seconds, and sometimes even jumps a tad above 2,000.


+1
My mazda revs up to 2,000 at first then stays at about 1,500 for about 20 seconds.

 

[Bluestream]

My old neighbor would put the gas pedal to the floor every time he started his car...

 

[Trav]

It no problem, when you replace a cam the engine is cold and needs to be revved to 2500-3500 RPM from cold start and held for 20 min to break the cam in.
Nothing bad happened.

 

[OrdnanceMarine]

You probably put something like the equivalent of 10 cold starts on the engine (wild guess). Doing this every day and you'd likely suffer a few years down the road. Doing this once and I don't think you could identify the harm you did if you tried.

Good thing is that it was brief and while the RPMs rose quickly, it's not like you had your engine loaded and producing a lot of power.

 

[oggb]

Won't hurt a thing. Because the oil was cool you'd have plenty of oil pressure right off the bat for the bearings, and the high RPM would've gotten oil to the valvetrain plenty quickly.

 

[Eddie]

Probably not the best thing to rev to 2-3K but, not much one can do about it unless there is a problem. I did find that if I hold the throttle down about 1/2 way when starting and let go quickly after it starts that my car will idle at 1000 instead of 2,200. This on a Mazda CX7.

 

[mechtech2]

Modern FI cars have a pretty fast cold start RPM.
This actually HELPS with oil circulation and wear.

Granted, 4k RPM is too high for start up, but I don't think any problems have or will occur.
Getting the revs up on a start is good.