So, I read almost all the posts I could find on this forum about the P-0191 code, and I have a new situation lol The problem started with the check engine light coming on and the truck bogging out and making a knocking noise coming from the air box when under heavy throttle. However, when you build up RPM slowly everything is fine.

Changed Fuel pump and filter (6 months ago), Fuel rail pressure sensor(last week), Fuel pump driver module (today)

After replacing the module the truck starts right up and idles okay, but still does the same things when you go heavy on the gas pedal. I am stumped lol I have auto Xrayed three or four times and keep coming up with 1 code P0191....

THANK YOU!!!1

 

Gas cap and vent lines

 

Where would the vent lines be located? and would removing the gas cap be a way to check if its the cap itself causing the problem?

 

The vent line runs along side of the filler neck...and all you can do for the gas cap is inspect it to ensure the "O" ring is good or replace .

 

Thanks for the info. replaced the gas cap and the problem got a little better but still a little hesitation on heavy load. going to check the vent line and ilyk. thank you!

 

Your welcome...did the code go away ??

 

got a new cap in it, haven't been able to see any damage on the vent line, but it's still doing the same thing and throwing the same code....iiddkk

 

Did you clear the code...and it come's back ??