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Engine runs rough and shuts off?

Tiny
STWRTSHLTN
  • MEMBER
  • 2003 FORD F-150
  • 4.2L
  • 6 CYL
  • 2WD
  • MANUAL
  • 245,000 MILES
Bank 2 exhaust is twice as hot as bank one. Could it be catalytic converter on drivers side?
Sunday, February 17th, 2019 AT 10:00 PM

11 Replies

Tiny
BMDOUBLE
  • MECHANIC
  • 1,139 POSTS
More than likely an ignition misfire. Unburned fuel will enter the converter and over heat it. This is bank 2 so the miss will be on the driver side. If your scanner has mode 6 capability, I would look at it and determine which cylinder is the culprit. This guide can help us fix it

https://www.2carpros.com/articles/engine-misfires-or-runs-rough

Please run down this guide and report back.
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Sunday, February 17th, 2019 AT 10:13 PM
Tiny
STWRTSHLTN
  • MEMBER
  • 2 POSTS
Codes p0302 and p0303 came up before codes p0174 and p0453. I replaced fuel pump and spark plugs. But those codes are misfired from cylinders in bank one.
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Sunday, February 17th, 2019 AT 10:30 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 42,895 POSTS
Hello,

Lets do a compression test on cylinders two and three. here is a guide to help:

https://www.2carpros.com/articles/how-to-test-engine-compression

Please run down this guide and report back.
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Wednesday, February 20th, 2019 AT 10:32 AM
Tiny
SCOPACE
  • MEMBER
  • 2 POSTS
  • 2003 FORD F-150
  • 6 CYL
  • 2WD
  • MANUAL
  • 140,000 MILES
I have a 2003 Ford F-150 (4.2L V6, Manual Trans) that's been running poorly for a while, both when idling and at speed. The engine vibrates, more so when accelerating, possibly indicating a misfire. The computer has thrown codes for the Bank 2 O2 Sensor 1, Crankshaft Position Sensor, Mass Airflow Sensor, and indicated a possible Fuel Injector problem. I have consequently replaced the injectors, cs pos sensor, mass airflow sensor, the indicated O2 sensor, and sparkplugs. I also cleaned my aftermarket cold air intake, checked for vacuum leaks, and changed my fuel filter. My next course of action I believe will be to test fuel pressure, and ensure proper functionality of the coil packs. If you have any suggestions or have heard of similar problems with these trucks in the past, your help would be greatly appreciated. Thanks a lot for your time.

Michael Pace
michaelbpace@yahoo. Com
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Tuesday, December 15th, 2020 AT 3:29 PM (Merged)
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,179 POSTS
I think you are on the right track with the next options you mentioned. However, have you checked everything on the engine for vacuum leaks? Also, have you checked the catalytic converter to make sure it isn't plugging?
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Tuesday, December 15th, 2020 AT 3:29 PM (Merged)
Tiny
SCOPACE
  • MEMBER
  • 2 POSTS
I have checked all the vacuum lines. Today it has thrown a new code: cylinder 3 misfire. This confirms my suspicion about the vibration, but I still don't know why its misfiring. Having just replaced the spark plugs and fuel injectors, I'm guessing it is either the coil pack for that cylinder or a loss of compression, possibly the result of a burnt up exhaust valve. So I guess I should forgo the fuel pressure test and instead test for compression and electrical spark. Does this sound right, and if so what is the best way to test the coil packs?
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Tuesday, December 15th, 2020 AT 3:29 PM (Merged)
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,179 POSTS
Check fuel pump pressure too. As far as the coil, switch it with one in a different cylender and see if the engine miss changes cylenders. If it is bad in cylender 3 it should cause a misfire in any of the other cylenders.
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Tuesday, December 15th, 2020 AT 3:29 PM (Merged)
Tiny
COYEDEAN
  • MEMBER
  • 1 POST
  • 2003 FORD F-150
2003 F150 V-8 Triton. 87k miles, automatic. Never been tuned up. Two days ago started idling very rough at signal light, when I start moving engine runs very rough. On the freeway it runs sluggish. Should I check the fuel filter first? Or should I give it a complete tune-up, plugs, etc.
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Tuesday, December 15th, 2020 AT 3:29 PM (Merged)
Tiny
BLACKOP555
  • MECHANIC
  • 10,371 POSTS
Time for tune up :D 87k miles is quite enough to not have a tune up also put some engine cleaner in the fuel to clean up the injectors and valves and the internal parts
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Tuesday, December 15th, 2020 AT 3:29 PM (Merged)
Tiny
BRWHITEMAN147
  • MEMBER
  • 1 POST
  • 2002 FORD F-150
  • V8
  • 4WD
  • AUTOMATIC
  • 205,000 MILES
My engine is throwing a code (lean on bank2). It seems to be running a little rough between 1200 to 1600 RPM's (it is not as noticable at higher RPM's). I have recently changed the fuel filter, sparkplugs and 2 COP's. I have check my fuel pressure and it is only 32psi instead of 55 psi. I have hooked an OBD-III to read the codes and the freeze data shows that my LTFT% is around 24 to 27. Any ideas with this problem will be gratly appreciated
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Tuesday, December 15th, 2020 AT 3:32 PM (Merged)
Tiny
BLACKOP555
  • MECHANIC
  • 10,371 POSTS
Sounds like the fuel trim is about right for a vehicle running with a lean condition and low fuel pressure.

Take vaccum line off of fuel pressure regulator. Does pressure come up? Notice fuel leaking out of fuel pressure regulator? If that all seems good next thing to do is change fuel pressure. After that its time to start looking at pump output
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Tuesday, December 15th, 2020 AT 3:32 PM (Merged)

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