Ecu not giving a code

SOURCE: new coil pack in 1998 Ford Escort failed in one week?

alright the most likely cause is the spark plug wires. put a set of wires on it and let us now how things are. good luck.

SOURCE: My Ford 2000 Windstar van is missing

Since you are getting the 171 and 174 at the same time you need to replace the mass air flow sensor.then clear the codes.After which take the car for a drive and let me know how it does.

SOURCE: 2002 ford taruas 3.0Lv6 keep having 2 replace coil

check your vacuum line and the electrical systems

SOURCE: schematic of front end parts for 99 f250 4x4 v10

4x4 will not ingage in f-250 v-10 checked all fuses under dash not sure what relay it is

SOURCE: I have a miss in my 2003 F250 super duty, replaced

I would say to replace the sensor and see if it helps. I assume you had the truck scanned and that was the only problem. The speed sensors usually relate to the ABS and Transmission shift points.

Both Autozone and Oreillys will scan for FREE. After you replace the sensor, get a water spray bottle and go around all the seams you can find on the engine while it is running. If the RPM changes you have found the vacuum leak that is causing the miss.

There is also another test that can be done electrically. It is the cylinder balance test. This directly relates to the compression of each cylinder.
While all the Diagnostics that showed the fault are accurate, the onboard computer does not tell everything.

Usually it can miss the mechanical issues like a vacuum leak, or a bad valve in a cylinder that is firing good electrically without the whole bank running rich with the unburned fuel from that one cylinder. This is because it averages the total burn rate for each bank.

On the V8 engines there are cavities below the Airhorn for EGR flow. If your V10 is similar you may want to look under the Airhorn gasket and clean the cavities. It should only cost your time and a gasket.