Our 2004 Saturn Vue with the 2.2L 5 speed manual is throwing a P0172 and a P0300. Car starts every time and drives fine. Has no problem on the freeway.
However, it has this “rythmic and constant” shake on idle that starts under 1000 rpms. It is most noticeable at 700+ rpm. You can feel the whole car shaking and you can see and hear it on the exhaust tailpipe too. I can attach a video if you guys like.
Sometimes after driving a while the car idles at 1000 rpm… sometimes it idles at 700 rpm. I don’t see the tach needle jumping around.
LTFT numbers are -8 to -14 depending on load. I took it to a shop for diagnosis. They told me that it was a problem with the throttle body.
I replaced this part myself but nothing changed. They wanted $100 for throttle body calibration but I was told by an ex Saturn dealer tech that I could do this myself without a scan tool by following a GM throttle body relearn procedure…
Vehicle already has a new coilpack, ICM and new plugs.
I have attached the shop observations here.
I tried to get second opinions from other shops but because of the Coronavirus situation most places are closed. Any help is appreciated.