1996 F150
4.9L
5spd, 4x4

Hello all, I recently bought my truck and it has a tough time starting when the engine is hot. When it starts, it chugs for a second, most of the time for a few seconds, and occasionally stalls out. It usually is fne after t chugs, idles normal and smooth.

The codes that I pulled from the engine are:
P0411 - Secondary air injection incorrect upstream flow
P1443 - EVAP system control valve low/no flow

My freeze frame data for the P0411 is
<table class="boder-top" cellspacing="0" width="100%"><tbody><tr><td>DTC for which Freeze Frame was Stored</td> <td> P0411</td> </tr> <tr class="bg"> <td>Fuel System 1 Status</td> <td> Open Loop - Drive
</td> </tr> <tr> <td>Fuel System 2 Status</td> <td> Not Supported</td> </tr> <tr class="bg"> <td>Calculated LOAD Value</td> <td> 20.00 %</td> </tr> <tr> <td>Engine Coolant Temp</td> <td> 197.60 °F</td> </tr> <tr class="bg"> <td>Short Term Fuel Trim - Bank 1</td> <td> 4.69 %</td> </tr> <tr> <td>Long Term Fuel Trim - Bank 1</td> <td> 3.91 %</td> </tr> <tr class="bg"> <td>Short Term Fuel Trim - Bank 2</td> <td> 4.69 %</td> </tr> <tr> <td>Long Term Fuel Trim - Bank 2</td> <td> 3.13 %</td> </tr> <tr class="bg"> <td>Engine RPM</td> <td> 700.25 rpm</td> </tr> <tr> <td>Vehicle Speed Sensor</td> <td> 2.49 mph</td></tr></tbody></table>
Would the incorrect air flow cause my truck to start hard when hot?

 

I just bought the exact same truck about 3 weeks ago but with an auto trans and had the exact same problem as you. Started fine in the morning but after operating temp id turn it off then it wouldnt start. I changed the ignition control module and problem solved. Cant say that is your problem but i hope this helps. Goodluck!

 

Thanks for the tip. Wondering if there's a way to test the module and see if it s bad or not, I'd hat to buy one and have it not help!