Had a problem with rough idle at stop for about a month or so now. I have replace the EGR and IAC. Replaced spark plug wires and plugs today (got a multimeter today showed a bad wire on the first cyl.). I am using an Andriod App Torque Pro for my OBD2 readings. RPMs continue to go around 750 and at that point I have a good amount of vibration in the steering wheel. If I get on the gas to about 850 - 900 rps, the vib is gone. I have tried different tricks to raise the rpms by the screw on the throttle body (like disconnecting the tps, pulling 2 pcm fuses disconnecting the battery and even up to unplugging the 4o pin connectors to the pcm.) All to no avail. Initial start will have the rpms where I set them but tap the gas, the rpms come down to my setting for about 2 seconds then slowly drop back down to around 750. And back to steering wheel vibration.
It has a Chrysler 2.0 4-cyl. How can I raise the rpms up? If it is totally controlled by the pcm (which I suspect), what kind of computer / scan tool can give me the extra 100 - 150 rpm's? Any other tips like what sensors I can probe for readings on the multimeter or other things to check?
Saturday, November 17th, 2012 AT 7:59 PM