My 2001 mustang v6 has a bad misfire upon starting but only if the engine has been warmed up, turned off and then restarted while still warm. I also smell strong fumes/exhaust when it misfires. It’s definitely NOT gasoline though.
If I let it cool down first or do a cold start there is no misfire and it will continue to drive perfectly even when it warms up to operating temperature.
So far I have only got a bank 2 lean code (P0174) and a P0193 code which indicates the fuel rail pressure sensor is malfunctioning.
First thing I tried was replacing the IAC (own idea) and also the fuel pressure regulator and fuel filter after looking up the code but none of these fixed the problem.
I reset the code after replacing these and nothing came back yet other than the CEL blinking 3 times and then shutting off (which indicates a misfire.)
My questions are:
1.) would a regular OBD 2 scanner tell me which cylinder misfire(s) are stored in the computer even though there is no check engine light now? Or do I need a super expensive scanner to see stored code history?
2.) Lets say hypothetically, when I do the scan, if it showed only cylinder 1 and 6 were misfiring for example, then could the fuel pump be ruled out and the injector for the corresponding misfiring cylinder would be the issue? If I’m not mistaken a bad fuel pump would cause all the cylinders to misfire?