Interesting valve adjust result.

[SilberUrS6]

After a valve adjust on my 3.2, the idle is about 100RPM higher when the car is warm. Cold idle is about 200 RPM higher.

If nothing was touched other than the valve covers and the valve adjusting bits, why would this be true?

[Reiver]

You tuned it up...now it breathes and exhales better is all.

[DaddyGlenn]

How far off were the valve adjustments?

[SilberUrS6]

Originally Posted by DaddyGlenn

How far off were the valve adjustments?

It didn't seem like much. I *did* touch all of them up, however. It didn't seem like there was any glaring gaps or lack thereof. Maybe my unskilled hands can't tell???

[redstrosekNic]

Does the car sound any different after the adjustment (more or less clatter)?

[Chuck.H]

You sure you didn't knock a vacuum hose loose?

Idle should be set by the ICV, not by 'tune of the engine'... unless the idle bypass valve was at it's limit of adjustment (too far open) and the ICV can't adjust the idle down far enough?

Chuck.H
'89 TurboLookTarga, 347k miles

[SilberUrS6]

Originally Posted by Chuck.H

You sure you didn't knock a vacuum hose loose?

Idle should be set by the ICV, not by 'tune of the engine'... unless the idle bypass valve was at it's limit of adjustment (too far open) and the ICV can't adjust the idle down far enough?

Chuck.H
'89 TurboLookTarga, 347k miles

I could have, but I don't think so. Wouldn't a big vacuum leak after no vacuum leak make it idle lower??? And driveability hasn't changed.

It did have a bit of noise before the adjust, when the engine was cold. After, it was clatter-free. Sounds like a sewing machine when first started up.

[E Sully]

Minor valve adjust by itself would not change the idle on the 3.2. DME controls it through the Idle Control Valve. You say the warm idle is 100rpm higher, fairly small change, but more relevant is the actual rpm. Assuming that you still have the stock chip installed, does it idle at 800 rpm?
I would make sure that the O2 sensor was still connected, those connectors tend to disintegrate from age and heat. I would then reset the base idle using the jumper in the port by the electrical panel. When the jumper is removed, see if it holds a steady 800 rpm, but drops a little when the oil cap is removed.

[DRACO A5OG]

+1 check for vacuum leaks, buddy's 86 3.2 had a leak and he had higher idle, after vavle adjust and chts fix, it was higher so we checked his base idle and it was set too high, adjusted and all is well.

[Guardsred911]

I had similar results, but on the '80 SC after dropping the engine, re sealing the triangle of death, new headers and exhaust, as well as valve...

I did have a backfire that popped the Pop - Off valve glue, which I fixed... but I looked closely for cracks and saw none

Similarly, I seem to be slightly higher... 200 at cold and 100 at warm... any suggestions on setting it?

(and yes, still scrolling through the list of posts, but this one seemed fresh and relevant)

So I just went into the garage and found the idle adjustment screw... I am wondering if I tweaked it when I dropped and reinstalled the motor... and all the other work I had been doing...

[Jdub]

It wasn't until I did a valve job on a Honda 400/4 (400cc 4cylinder) that I understood what opening up the valves meant. A choked (read: tight valve) drivetrain won't make much noise and won't idle well. Getting the recessed valves to now open at the proper adjustments will increase idle and let you hear the valves sing. The toughest valve job you will ever do is on a 911 tho. - no question!

[LakeCleElum]

I had the same result (higher idle) with a 911 once. The valves had not been adjusted in a long time and were on the tight side.
My theory: Valves weren't quite closing all the way and losing a little compression? It certainly was not a vac leak.