LT1 PCM Problem/Question (HELP!)
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I hope there are some LT1 experts here!!!!! ![Hail](https://ls1tech.com/forums/images/smilies/LS1Tech/gr_hail.gif)
I have a 1993 Z28 LT1. The "service engine soon" light comes on when I drive it. In the AM on my way to work when it is cold it is fine, light is off for about 10-15 miles of driving then the service engine soon light comes on. If I park for 4-5 hours and start it up it will come on right away. The car runs and drives fine and has no problems that I can see. The code indicates the problem is with quad driver #1 in the PCM. Quad driver #1 controls EGR sol., evap. sol. and the AIR pump relay. I have changed the EGR sol., Evap. sol. and the AIR pump relay and had the PCM gone through by A1 Cardon and I still have the same problem. Cat converter is about 1 1/2 years old.
Any ideas guys??????????????????????????![Bang Head](https://ls1tech.com/forums/images/smilies/LS1Tech/gr_banghead.gif)
Thanks
Dennis
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I have a 1993 Z28 LT1. The "service engine soon" light comes on when I drive it. In the AM on my way to work when it is cold it is fine, light is off for about 10-15 miles of driving then the service engine soon light comes on. If I park for 4-5 hours and start it up it will come on right away. The car runs and drives fine and has no problems that I can see. The code indicates the problem is with quad driver #1 in the PCM. Quad driver #1 controls EGR sol., evap. sol. and the AIR pump relay. I have changed the EGR sol., Evap. sol. and the AIR pump relay and had the PCM gone through by A1 Cardon and I still have the same problem. Cat converter is about 1 1/2 years old.
Any ideas guys??????????????????????????
![Bang Head](https://ls1tech.com/forums/images/smilies/LS1Tech/gr_banghead.gif)
Thanks
Dennis
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Thanks again for the help!
Dennis
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Thank you again for the help!
Dennis