Slow to crank stabilitrac light and no tach

[Da2ss]

Hey guys
I just bought a cammed ls3 2013 ss it had a slow to start and Terrible 12.5 MPG when I bought it checked the battery and it was fine I felt like it is heat soak then after driving it over the last 3 days I get Service Stabilitrac and my tach stopped working I continued home and started to get small backfires and exhaust crackle that was new I was looking around under the hood and noticed no vacuum line on the back of the driver side valve cover I haven't drove it to town to get the codes pulled yet.

[PhilR4]

I had almost the exact same issues on my 2010 Camaro ss, except for the vacuum line. When I checked the engine codes, it said the crankshaft sensor was a problem also. I replaced the battery, and now almost everything is working. The mass airflow sensor is not working right now, so I tried spraying it with MAF sensor cleaner, but it didn't do any good, so I have ordered a new sensor. If I were you, I would try a new battery, and see if that fixes it. Or at least bring it to a place that does free battery testing and have them check it again.

[CyberPredator]

Originally Posted by Da2ss

Hey guys
I just bought a cammed ls3 2013 ss it had a slow to start and Terrible 12.5 MPG when I bought it checked the battery and it was fine I felt like it is heat soak then after driving it over the last 3 days I get Service Stabilitrac and my tach stopped working I continued home and started to get small backfires and exhaust crackle that was new I was looking around under the hood and noticed no vacuum line on the back of the driver side valve cover I haven't drove it to town to get the codes pulled yet.

most likely need to add a ground wire to the car. Had these exact symptoms when the car started and hot (Like just finished driving it and restarting the car). Got the ground wire and the car starts perfect.