Hello, my name is Nate, I'm having issues with my 2009 mustang V6 4.0. I have been driving it for work lately and as of this week it's died while at a low rpm or idle. If replaced the fuel filter, the crank shaft position sensor, the MAF sensor, the fuel pressure control module and now I'm uncertain if it's my fuel injection pressure sensor or my fuel pump. Could you give me some insight on which route I should take to figure out which one is bad?
I'd suspect either a dirty/malfunctioning MAF sensor or a dirty throttle body because your Mustang doesn't have an Idle Air Control valve.
Idle is computer controlled by inputs from the MAF and Throttle Position Sensor(s).
((it could be the TPS sensor but if it runs good at all other RPMs, then probably not))
replaced the fuel filter, the crank shaft position sensor, the MAF sensor, the fuel pressure control module
Did those parts test as bad? Have you checked fuel pressure with an external gauge? Scanned for codes and live data? Fuel system problems should show up in the fuel trims.
@NateDavis808
It could be any number of things, including a vacuum leak.
I have a 2010 V6 4.0L Mustang with ~140,000 miles. I had rough idle, borderline stalling, and simply replace the spark plugs and ran a few a few tanks of gas with fuel injector cleaner. I also found a cracked spark plug on one of the cylinders.
With a Ford, I recommend you look at https://forscan.org/ Windows ODBII software and a Forscan compatible OBDI II scanner https://www.amazon.com/gp/product/B081VQVD3F for $60. It will allow you to read all the raw engine data to help isolate the problem more precisely.
The extended license will allow you to run service functions and reprogramming new/used electronic modules. You can use the free extended license for 2 months, or buy the one year extended license for $12.
I bought a used ABS module off evilBay and took it to a ASE certified shop to have installed on a different Ford. The ASE certified shop could not reprogram the ABS control module to the vehicle. I used Forscan to reprogram the used ABS module using the as-built configuration information Ford makes publicly available. https://www.motorcraftservice.com/
You can read about it here. https://carkiller.com/scottykilmer/qa/2012-ford-escape-abs-module-vin-reprogramming/
