Wasted Income
July 19th, 2011, 11:41 PM
Guys, looking for advice....
I was touching up the idle tune on my buddy's 383 LS6 CTS-V last night. Ran great all day, until I got caught in the rain a few miles from home.
It started missing / shaking really bad, both at idle, and under load. I also noticed that it is now dieseling at shutdown. (runs for a couple seconds after the key is turned off).
I searched around a bit, and it seems that O2 sensors can cause the rain misfire, but what about the dieseling? Idling so rich, that it continues to run on after key-off?
The car has longtubes and extensions with new(er) sensors.
I took a datalog with EFILive last night, and it appeared that the O2 voltage was hanging "high" around 700-800 mv, with very little, if any rich/lean switching.
Please help, my bud is supposed to sell his car on Saturday, and I want to square this away before giving it back...
I can take a datalog tonight if anyone is interested...just let me know what PIDs you'd like to see?
I was touching up the idle tune on my buddy's 383 LS6 CTS-V last night. Ran great all day, until I got caught in the rain a few miles from home.
It started missing / shaking really bad, both at idle, and under load. I also noticed that it is now dieseling at shutdown. (runs for a couple seconds after the key is turned off).
I searched around a bit, and it seems that O2 sensors can cause the rain misfire, but what about the dieseling? Idling so rich, that it continues to run on after key-off?
The car has longtubes and extensions with new(er) sensors.
I took a datalog with EFILive last night, and it appeared that the O2 voltage was hanging "high" around 700-800 mv, with very little, if any rich/lean switching.
Please help, my bud is supposed to sell his car on Saturday, and I want to square this away before giving it back...
I can take a datalog tonight if anyone is interested...just let me know what PIDs you'd like to see?