Hello,
I have a question. - Can old oil result in a higher idle speed (1500rpm)? I thing, that is as the only possibility to come...I have exhausted all possibilities (releases vacuums, senzors...). I read a lot of there, but I donīt have a solution....

Crossfire 2004 3,2l 160kW

Thanks

 

Short answer : NO

Still acts like a vacuum leak to me.

 

Simple solution - change the oil.

But that will not solve the problem as far as I am concerned, look for a vacuum leak.

 

I really tried everything. Re-sealing the lid, intake, trottle ...... MAF change .... I'm unhappy

 

And you have no "Check Engine" light? Is that right?

You might try to get the codes read, even without a Check Engine light, there may be pending codes that give you a hint of what is going on.

This can't be that hard, the PTCM knows the engine speed based on the Crank and Cam sensor signals. It has to be speeding up the engine because it is trying to compensate for SOMETHING.

I wonder if the temperature sensor is telling the PTCM that the motor is not warming up? That is, it is "high idling" because it thinks it's not warmed up yet.

This device would allow you to read codes AND see the readings the PTCM is getting from various sensors. I have one and it has helped from time to time (and is a fun toy to use when things are working right!)

UltraGauge OBDII Scan tool & Information Center

 

Have you looked at the vacuum line that passes underneath the battery?
It has failed in some cases, it was damaged by battery acid and leaked. Just a thought.