SatchMax Posted August 18, 2017 Report Share Posted August 18, 2017 Wifes 2005 car with 29500 has misfire on start up. Thought it was gas, new tank full, still misfires, but runs great after 8 to 10 miles of driving. shows 28 to 30 miles per gallon on gas. what could be causing this misfire on start up SatchMax Link to comment Share on other sites More sharing options...
Bruce Nunnally Posted August 18, 2017 Report Share Posted August 18, 2017 My guess is Fuel pressure regulator Bruce 2023 Cadillac CT4-V Blackwing Follow me on: Twitter Instagram Youtube Link to comment Share on other sites More sharing options...
OldCadTech Posted August 18, 2017 Report Share Posted August 18, 2017 Does the Service Engine Soon light ( SES ) come on? My first thought is spark plugs or coil pack. Pull the plugs and check them for dry black sooty deposits which indicates rich mixture or weak spark. THERE IS ALWAYS ENOUGH TIME TO DO THE JOB RIGHT - THERE IS NEVER ENOUGH TIME TO DO THE JOB AGAIN !!! Link to comment Share on other sites More sharing options...
barczy01 Posted August 20, 2017 Report Share Posted August 20, 2017 I have a 02 Deville that sits for an extended period of time . It misfires when Started and sometimes it's real bad. I have a lifter, valve lash adjuster the bleeds down causing the mis and runs smooth as glass after a couple minutes. Link to comment Share on other sites More sharing options...
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