tin747

Date posted: 10/07/2006 7:39 pm  Subject: Weird idle and missing

I have a 05 saturn ion with 13,000 miles. (Manual Tranny) It idles fine 95% of the time, but every once in a while it may drop to 500RPM or go up to 1100 Rpms for no reason. Also when driving sometimes I can feel the car missing. Doesn't matter what speed I am going at. It has a 2.2Liter Ecotec motor. The check engine light came on a few days ago and stayed on for 1 day. I turned it of and on several times that day and it stayed on. I had it scanned yesterday when the light was off and he got code p0171. If anyone has any idea what to do please help. Thanks!

 

mrdiy

Date posted: 10/15/2006 8:09 pm  Subject: re: weird idle

A code P0171 refers means that your car is experiencing a lean fuel situation. Possibly fuel injectors, fuel filter, fuel pump or a number of other systems that effect the fuel/air ratio, such as the EGR.

I suggest, first try some fuel injector cleaner and changing the fuel filter (since those are the easiest and cheapest) and go from there.

If you are getting a misfire code for a specific cylinder, then the fuel injector for that cylinder is likely bad.

 

alexred

Date posted: 11/14/2006 7:23 pm  Subject:

The most common cause of lean misfire is vacuum leak. Before going into fuel delivery diagnostics, check all vacuum hoses and pipes after Mass Air Flow Sensor.