A whole bunch of problems

[m0ng0]

So the wifes van 2003 Montana is really giving us trouble these days.

We have the following codes
P0107, replaced Map sensor, code still there
P0138 o2 sensor was replaced, code still there
P0140 o2 sensor was replaced, code still there
P0300 Random misfire (we did have new plugs installed) but not wires or coils
P0442 gas cap?
P1107 Mass airflow sensor was cleaned but not replaced

In addition to these the heated seats stopped working, now we are getting intermittent issues with the power windows, power seats and sometimes the AC fan will not turn on.

Could a wonky alternator or voltage regulator do this? Could it be the battery or do I have bigger issues with the ECM or another of the computers in this thing? The only reason I ask is because most of these problems seem to have voltage in the code.

Thanks everyone!

 

[melsg5]

have you checked the alternator output and had a load test of the battery?
before replacing the map sensor did you do any of the tests on this link?

http://www.obd-codes.com/p0107

 

[m0ng0]

update!!! Got a scan tool and went down the list.....

brand new MAP sensor tested bad, installed new and two codes cleared p1107 and p0107.

Then I swapped out all the ignition coils....did not clear.

I bought new plug wires and AC plugs, was at the end of the day and really did not want to attempt to change the backside plugs and wires, so I just did the front side plugs and removed the NGK(!) plugs that were in the front p0300 CLEARED and it runs great.

Now its just down to the 02 sensors and replacing backside plugs and wires and she will be right again!