Codes PO171/PO174
 

1997 Ford F150XL 2WD 4.2LT.
Today I replaced the 2 upstream O2 sensors and I got it running,But still has a slight miss.And still running like crap.
And I tried to start it an hour ago and it won't start,It acts like it wants to start,But won't.

This is what I have done in the last 4 months:
New;
Air filter
Mass Airflow Sensor
Spark Plugs
Spark plug Wires
Fuel Filter(was very dirty when draining fuel from old filter)
PCV and Elbow

And 2 years ago,I replaced the EGR Valve(new),EGR Vacuum Solenoid(new), and DPFE Sensor(used)

BTW,I sprayed some Carb and Choke cleaner around the intake and vacuum lines and no change in the idle pitch.

That usually doesn't work, the computer is too fast.

Those sensors do not cause the problem, they report the problem.

Probably unrelated to the original problem.

The 4.2 of that era was very prone to intake gasket and isolator bolt leaks.

Verify you have the correct fuel pressure. Insufficient fuel volume at pressure is one of the possible causes of your fault codes.

Use your scan tool and monitor either the short term fuel trims or the upstream O2 sensor voltages and do your spraying around the intake. When the flammable gets sucked into the intake, you'll see it.

Okay,I'll have to wait.Money is lower now and can you recommend a cheap but good code scanner?The last codes I had done at O'Reilly auto parts.
Since I put the O2 Sensors in the check engine light has not come back on.
And I just went out and tried to start it and it did start(Idle very rough)and it smelled very rich while running.

Hey anyone,I noticed my air intake is the aluminum(not plastic).Does this aluminum air intake still leak like the plastic ones?

Do you have an Android phone or tablet?

Yes I have an Android(LG G2) and a laptop,But my laptop does not have Bluetooth.

You'll need BT.

Get a BT-OBDII adapter off ebay, about $25. Buy the Torque App, for less than $10. You'll then have what you need

Ok thank you and I have a new issue,
The Check Engine light has not come back on yet.
I went out to start the truck and got a hard start(took 4 try's).
And when it did start,It backfired and stumbled all the way to the store.Backfired and lose of power until I floored the throttle.
Still running like crap.

That usually means you have a severe vacuum leak or a weak fuel supply.

Does it matter which BT OBD II?
Do you mean Torque by:Ian Hawkins?



Ok,Thanks again.So I might have to wait for the bluetooth scanner to see for sure.
This really sucks and this truck is our only ride.

Well here is what the codes are now P1537/P1538;Intake Manifold Runner Control Stuck Open.
Now the truck has not run for about 2 weeks.Afraid to drive it.

Does my truck have 2 of these Intake Manifold Runner Control?

Code 1531= bank 1.
Code 1538= bank 2.
Good luck.

What do you mean? I can do the work.