Just changed spark plugs to rid my misfire code P0304. That cleared that one but now I'm getting another misfire code in cylinder 2 (P0302). Below is the freeze data I caputured from the OBD II scanner. I cleared and then recaptured the code three times (below) to try and help with the troubleshooting. Can someone school me on interpreting the data? I assuming it's the injector causing the problem. If so, should I buy a new one or have this one cleaned? Or, should I first take it to a shop that can do a motorcraft power injector flush (never done this before and I hate to foul my new plugs, they were B#$%!) to change)? Should I buy a "noid" light to make sure the pluses are all getting to the injector? Just looking for a little helpful advice.

Ken

97 Expedition 5.4 Triton 150,000 miles.

1st, 2nd, and 3rd code captures

DTC that caused freeze frame p0302 p302 p302
engine rpm 642 2499 1962
load value 32.1% 92.5% 62.7%
coolant temp 179deg 201deg 203deg

short term fuel trim1 0.8% 2.3% 4.6%
long term fuel trim1 11.7% 2.3% 0.7%

short term fuel trim2 -3.4% -1.0% 0.8%
long term fuel trim2 6.2% 2.3% 0.0%

short term fuel trim3 8.5% -18.8% -99.3%
long term fuel trim3 -4.6% 80.4% 72.6%

short term fuel trim4 28.9% 24.2% 1.5%
long term fuel trim4 -74.3% 85.9% 57.0%

vehicle speed 0 mph 37mph 22mph

fuel system 1 clsd clsd clsd
fuel system 2 n/a n/a n/a

 

well I don't know what the codes mean but a bottle of fuel injector cleaner costs next to nothing, or you could try a seafoam job. Either of these might clean it up for you.

 

The noid light will tell you if the injector is getting a signal. If the light flashes, I would just get a new one.

 

Got this one fixed.

Swapped #1 and #2 COP's. Problem moved to #1.
Went to local parts store and bought one new motorcraft COP.
Cleared that code...

Then -

During test drive, got a pending code P0304 (misfire #4).
Cleared code to verify. Next test drive got a Check engine light.
Code came up as P0303 (misfire #3).

Scratched head......

Went to local scrap yard and bought a handful of used COP's.
Replaced #3 and #4 COP's.

All is well now. Been driving it for a little over a week now, code free. Actually runs pretty darn good. Starts right up, no knocking or weird noises, averaging 13.5 mpg.

My next step will be to return the OBD II reader I have (Actron CP175) for one that will let me read live data (it's running fine now, I'm just curious to see the live data). I'm doing some research on them now. Best bang I've seen for the buck so far is the ProScan Universal Scan Tool / serial interface (appx $150). Post it here if you have good recommendation.

Ken

 

Sorry for the silly question but what does "COP" stand for? Thanks.

 

COP - Coil on Plug Our 5.4 engines have an individual coil on top of each plug.

 

Does my 2000 4.6L have COPs?

 

My guess would be yes.. If you don't see any spark plug wires, you have COP's.