» » »

Saturn Q&A

Ask Your Question

2007 Saturn Ion Question: Check engine light illuminates

 

Question

jvito, Lemoore, CA, December 29, 2010, 16:11
 Rookie

The check engine light of my 2007 Saturn Ion 3 illuminates constantly. I took it to a repair shop and the owner told me that the 3rd cylinder is misfiring. However, no one could figure out the cause of the problem I took my car to a friend's house, and he used a code reader to extract the trouble code from the computer. I don't know what the code was, but he confirmed a misfire in the 3rd cylinder. The car seems to run fine, but the check engine light stays on. What could the problem be?

2 Answers
Flag This
  • Answer #1

    December 29, 2010, 16:23
    Profile_thumbnail
     Master

    well, you need compression, spark and fuel to make the cylinder work. all these things need to be checked.

    Roy

    Flag This
  • Reply

    Visitor, December 29, 2010, 19:31

    what about oxygen?

    Flag This
  • Reply

    jvito, January 24, 2011, 12:15
     Rookie

    I took my car to another mechanic, and he performed a compression check on all 4 cylinders. He discovered that the compression was relatively low in the 3rd cylinder compared to the others. He believes there is a problem in the valves. I hope he is right, because a valve job is pretty expensive.

    Reply
    Flag This
  • Answer #2

    patrick mannion from Greg Solow's Engine Room, December 29, 2010, 22:03
    Profile_thumbnail
     Master

    A professional grade scan tool will give misfire count per cylinder, and air/fuel ratio fuel trim figures to show if a cylinder is "lean", as Roy said, check compression see its even, look for vacuum leaks at manifold, mis-fires can be hard to trace without training or very good scan tool.

    Flag This
  • Reply

    jvito, January 24, 2011, 12:15
     Rookie

    I took my car to another mechanic, and he performed a compression check on all 4 cylinders. He discovered that the compression was relatively low in the 3rd cylinder compared to the others. He believes there is a problem in the valves. I hope he is right, because a valve job is pretty expensive.

    Reply
    Flag This