iX ... weird revving pattern

[EA8]

Just within the past couple of days I have noticed the engine revving around 1500-1700 when the car is in neutral, but once I shift into gears, the revs drop down to around 800 or so (which is normal). this all happened after I did some maintenance (oil change, fuel filter and cleaned out my ICV).

Before any of this, my idle revs would jump around between 700 & 1200, which is why I decided to clean out the ICV and it seems to have cured the jumping around issue, but now I am lost as to why the revs are the way they are.

Any assistance? Ideas of what the hell is happening?

Cheers

[jlevie]

My first suspicion would be an intake leak.

[gearheadE30]

Yeah, probly a vacuum leak. Check everything that you touched while you were in there first, but the leak may have been the cause of your idle issues in the first place.

[EA8]

I have already went through and checked all the intake parts from before and nothing so far ... is there anything else it could be??

thanks fellas

[JGood]

Is the car automatic?

Sounds like the ICV may still be bad. Do you have access to a known-good part to try?

[EA8]

Is the car automatic?

Sounds like the ICV may still be bad. Do you have access to a known-good part to try?

car is a manual ... I will go through and double check everything once more. Maybe I'll even take everything apart and put it back together carefully.

the thing that is confusing is that this intermittent.

I'll keep you guys posted

[EA8]

I just went through and took it all apart and tightened everything back together carefully with new hose clamps and still same issue. I am going to run some fuel injector cleaner through it over the next couple of days and see if that helps at all.

[JGood]

When you shift gears, how do the revs drop? The Motronic system does not interface with the trans... Actually nothing interfaces with the trans, there is no way rpm's would drop when you put it in gear (as long as the clutch is depressed).

[EA8]

When you shift gears, how do the revs drop? The Motronic system does not interface with the trans... Actually nothing interfaces with the trans, there is no way rpm's would drop when you put it in gear (as long as the clutch is depressed).

true ...

the drop in rpms from 1500 to the normal 700-800 comes right after pressing the gas pedal slightly, when in gear. I should have been a little more clear on that. sorry for the confusion.