posted on Aug, 30 2011 @ 05:35 PM
reply to post by ParanoidAmerican
I will try as you suggest.
This is an intermittent problem. Most of the time it runs fine, other than the crappy fuel mileage that it gets and always has since I bought it. When
it acts up one of two things happen. 1) in drive, the idle will drop down to 400-500 rpm and possibly die. 2) in drive, and usually at a stop light
the idle will jump up to 1000-1500 rpm and idle real high. Kind of seems like the idle sensor, but I do not think it is the case here. Now, as soon as
I start it I know if it is going to run good or run bad. I can leave the house and it will run fine, and if I run into the store to get something,
then it is possible that when I start it up again it will run terrible, until I maybe shut it off and start it back up.
The times that I have had the trouble codes read, the first time it was the O2 sensors, I replaced them but did not fix the problem. The next time I
had the codes read, it reported the O2 sensors AND the mass airflow. I replaced the mass airflow, and did not fix it. The next thing, the code reader
reported an EGR problem, replaced and no joy.
Now, to me, it is becoming clear that the parts that I have replaced are operating correctly and probably were before I replaced them. But what I
think is actually happening is that, for instance, the O2 sensors were operating properly, but something further up the line is malfunctioning and
sending bad stuff to the O2 sensor that it is not expecting to see(lean, rich??? It, does run a little rich), thus making the computer think it is
bad, same concept with the mass airflow and EGR. IMO
Actually when the code reader hit the O2 sensor, it was only reporting the problem on one bank. So, only one O2 sensor was being reported
edit on 30-8-2011 by Skewed because: (no reason given)