rgorke
Dedicated LVC Member
04 V8
Sometimes in the morning, I get some misfiring until the motor warms up. My OBD2 phone app has a "Total Misfires" and "Current Misfire" PID and I will get 2 -6 under the "total misfires" but never a "current misfire".
Maybe related, I have had a P0171 and P0174 code pop up in the past although it has been a few months since my CEL came on. I can also see that my short term fuel trims are both high (mid 20s) until the motor warms up.
After warm up, no misfires, STFT and LTFT are +/- 5 and <12 respectively.
Checked for vacuum leaks and changed all vacuum hoses and also intake manifold gaskets.
Coils were replaced in July 2016 with Motorcraft.
I'm looking for some ideas on what to check next. Smoke test is on the list for the STFTs but the misfires are a mystery. The car runs great (now that my cooling system is behaving) so no "real" performance issues or codes, just those issues at start up.
Thanks!
Sometimes in the morning, I get some misfiring until the motor warms up. My OBD2 phone app has a "Total Misfires" and "Current Misfire" PID and I will get 2 -6 under the "total misfires" but never a "current misfire".
Maybe related, I have had a P0171 and P0174 code pop up in the past although it has been a few months since my CEL came on. I can also see that my short term fuel trims are both high (mid 20s) until the motor warms up.
After warm up, no misfires, STFT and LTFT are +/- 5 and <12 respectively.
Checked for vacuum leaks and changed all vacuum hoses and also intake manifold gaskets.
Coils were replaced in July 2016 with Motorcraft.
I'm looking for some ideas on what to check next. Smoke test is on the list for the STFTs but the misfires are a mystery. The car runs great (now that my cooling system is behaving) so no "real" performance issues or codes, just those issues at start up.
Thanks!