Engine Mechanical problem
1997 Plymouth Voyager 6 cyl Two Wheel Drive Automatic 157000 miles
Even though my mini van has high mileage, It still has about 98% of engine compression still left. It still runs great, but my question is that why does my engine idle smothly during the summer months, but somewhat erratically during the winter months? In the drive position, while stopped, after engine has reached normal operating temperature, the R.P.M's sometimes dips to about 490 to 510 rpm, then it goes back to it's normal 670 rpm to 725 rpm if accessory is turned on, but during the summer months, it stays on 670 rpm in drive, and 725 rpm with A/C on, and running smoothly. I always check for vacuum leaks, and also frequently manualy clean the intake plenum, and intake system. I frequently change the oil, tune-up the minivan, change the fuel filter, change the trans fluid and filter, you know the works, but what happens puzzles me, so if anyone know the answer to this question, please let me know.
have the same problem?
Thursday, October 22nd, 2009 AT 6:29 PM