Po 303
#1
Po303 & p2196
Truck ran great last night. This morning started up fine backed out driveway then running rough as heck and code PO 300 came up then after I cleared that PO 303 only... Just pulled the cop and plug. Swapped out the cop with a known good one and still same issue. Checking Evap canister purge valve next, then changing fuel filter. EGR system ? where is that on a 2005 5.4?
My service manual says it could be:
My service manual says it could be:
- Ignition system
- Fuel injectors
- Running out of fuel
- EVAP canister purge valve
- Fuel pressure
- Evaporative emission system
- EGR system
- Base engine
Last edited by nu-supercrew; 11-15-2018 at 12:34 PM.
#3
The injectors were replaced a while ago. New spark plug and known working cop going on #3 cylinder.
Purge valve seems ok did resistance check.
#6
PO 303 is gone. It is still doing the same thing. I start it up, runs ok, when idle comes down starts running rough as soon as it warms up a little... and now I have DTC P2196 Rich bank 1. Maybe injector stuck open? #3 plug was not wet....
Last edited by nu-supercrew; 11-08-2018 at 02:12 PM.
#7
P2196 Ford:
Possible causes
- Faulty Front Heated Oxygen Sensor Bank 1
- Front Heated Oxygen Sensor Bank 1 harness is open or shorted
- Front Heated Oxygen Sensor Bank 1 circuit poor electrical connection
- Inappropriate fuel pressure
- Faulty fuel injectors
- Intake air leaks may be faulty
- Vacuums leaks
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#8
P2196 Ford:
Possible causes
- Faulty Front Heated Oxygen Sensor Bank 1
- Front Heated Oxygen Sensor Bank 1 harness is open or shorted
- Front Heated Oxygen Sensor Bank 1 circuit poor electrical connection
- Inappropriate fuel pressure
- Faulty fuel injectors
- Intake air leaks may be faulty
- Vacuums leaks
#9
#10
#11
If you've never changed the upper stream O2 sensors, I would suggest doing it using Motorcraft only O2's. Makes a big difference in how it sets up the air/fuel which may be your miss/rough idle. As a maintenance item, they should be changed every 75,000 miles for optimum fuel mileage and performance.
#12
If you've never changed the upper stream O2 sensors, I would suggest doing it using Motorcraft only O2's. Makes a big difference in how it sets up the air/fuel which may be your miss/rough idle. As a maintenance item, they should be changed every 75,000 miles for optimum fuel mileage and performance.
Last edited by nu-supercrew; 11-10-2018 at 03:37 PM.
#13
On the 2004 that I had, it was FAR easier to drop the entire exhaust system at the exhaust manifolds. You can easily get to them when they are on the ground.....or close to the ground anyway. I don't know of any other way to do it. I even had a set of crows foot wrenches and they were of zero value. Once I got the exhaust pipe to manifold nuts loose, it was about a 30 minute job. I reused the donut at the manifold/exhaust pipe as it was like new. FWIW, the nuts on the manifold that holds the exhaust pipe on were not rusty. A little Kroil, wait a few minutes, and used an electric impact wrench. Came right off.
#15
On the 2004 that I had, it was FAR easier to drop the entire exhaust system at the exhaust manifolds. You can easily get to them when they are on the ground.....or close to the ground anyway. I don't know of any other way to do it. I even had a set of crows foot wrenches and they were of zero value. Once I got the exhaust pipe to manifold nuts loose, it was about a 30 minute job. I reused the donut at the manifold/exhaust pipe as it was like new. FWIW, the nuts on the manifold that holds the exhaust pipe on were not rusty. A little Kroil, wait a few minutes, and used an electric impact wrench. Came right off.
Thanks Lab Nerd and glc for the help....
Last edited by nu-supercrew; 11-11-2018 at 04:06 PM.