Hi guys. Ill try to be as brief as possible. I need guidance. 1995 F150, 302, auto, 4WD. About 160k miles. Been having issues and today it got worse. Truck has been not wanting to start when warmed up to operating temp. Starts great when cold. Hesitates and stumbles (like it's running on 2 cylinders) when it's warm. Check engine light goes on and off intermittently. I took it to O'Reilly a few weeks back. Codes were 181, 172, and 565. Recently got a new job and haven't had 2 min to spend on it. Just drive to work in the morning and back at night. No running errands in town where I know ill need to shut it off. Last week a couple times parking when I'd shift into reverse from drive it would die. But start back up after a try or two. Today at a stop it was idling fine then died. Started right back up and idle normal but when I'd go to accelerate it would stumble bad and I'd put pedal to the floor and barely get any power. Tonight I tried to start it. It starts great, runs for 5 to 15 seconds then dies. But starts right back up, runs and dies. Several times. First time it's ever done this. Any advice on where to start would be awesome. No idea if I have any new codes. Ill try to get them read tomorrow. Thank you!!!!

Side note: when I first start the truck I can smell fuel. No leaks but seems to run really rich.

 

The first two codes point to a faulty O2 sensor. 565 is likely related to it as well. I remember my mother's '89 Chev Cavalier had the exact same symptoms and it turned out to be the O2 sensor around the cat, in her case.

I'd say to start looking at the O2 sensor first.

172 - Oxygen sensor not switching – system is or was lean – Single, Right or Rear HO2S – Fuel control
181 - Fuel system was lean at part throttle Single, Right or Rear HO2S – Fuel control
565 - Canister Purge 1 solenoid/circuit failure – Solenoids

 

I'd be looking at the plastic vacuum lines and the vacuum reserve canister as well.

 

Ok. Awesome. Thank you! I think there is only 2 sensors so this must be the rear one I'm guessing?

 

Ill be sure to check those out. Is the canister that big coffee can thing?

 

There is two, but I'm not sure which one it would be. One's near the firewall. Check the wiring/connections and make sure the electrical is all good at both.

The answer to your other question is yes, its the coffee can on your passenger fender well.

 

Great. Thank you. Ill check it out.

 

Fuel pressure gauge to test pressure. TPS is another possibility as well. Plus what the other guys said.

 

[QUOTE=Chris_1;4418506]Fuel pressure gauge to test pressure. TPS is another possibility as well. Plus what the other guys

Well problem solved. Ended up being the fuel pump. Down to 11 psi. Runs good now. Thanks to you all

 

F/P gauge sure narrows things down fast, doesn't it ? Glad you got it fixed.